From a3d77421fdd66983e7b1d591469ee8335d8ba54c Mon Sep 17 00:00:00 2001
From: perf3ct <jonfuller2012@gmail.com>
Date: Sun, 24 Aug 2025 05:17:28 +0000
Subject: [PATCH] feat(options): allow for user selection of ckeditor plugins

---
 .../src/services/ckeditor_plugin_config.ts    | 223 +++++++
 .../src/translations/en/translation.json      |  37 ++
 .../widgets/type_widgets/ckeditor/config.ts   |  18 +-
 .../widgets/type_widgets/ckeditor/toolbar.ts  | 249 ++++---
 .../widgets/type_widgets/content_widget.tsx   |   4 +-
 .../type_widgets/options/ckeditor_plugins.tsx | 397 ++++++++++++
 .../server/src/routes/api/ckeditor_plugins.ts | 388 +++++++++++
 apps/server/src/routes/api/options.ts         |   1 +
 apps/server/src/routes/routes.ts              |  10 +
 apps/server/src/services/options_init.ts      |   4 +
 packages/ckeditor5/src/index.ts               |   2 +-
 packages/ckeditor5/src/plugins.ts             | 612 ++++++++++++++++++
 packages/ckeditor5/tsconfig.json              |  11 +-
 packages/ckeditor5/tsconfig.lib.json          |  11 +-
 packages/commons/src/index.ts                 |   1 +
 .../src/lib/ckeditor_plugin_interface.ts      | 163 +++++
 packages/commons/src/lib/options_interface.ts |   3 +
 17 files changed, 2019 insertions(+), 115 deletions(-)
 create mode 100644 apps/client/src/services/ckeditor_plugin_config.ts
 create mode 100644 apps/client/src/widgets/type_widgets/options/ckeditor_plugins.tsx
 create mode 100644 apps/server/src/routes/api/ckeditor_plugins.ts
 create mode 100644 packages/commons/src/lib/ckeditor_plugin_interface.ts

diff --git a/apps/client/src/services/ckeditor_plugin_config.ts b/apps/client/src/services/ckeditor_plugin_config.ts
new file mode 100644
index 0000000000..ea70276a68
--- /dev/null
+++ b/apps/client/src/services/ckeditor_plugin_config.ts
@@ -0,0 +1,223 @@
+/**
+ * @module CKEditor Plugin Configuration Service
+ * 
+ * This service manages the dynamic configuration of CKEditor plugins based on user preferences.
+ * It handles plugin enablement, dependency resolution, and toolbar configuration.
+ */
+
+import server from "./server.js";
+import type { 
+    PluginConfiguration, 
+    PluginMetadata, 
+    PluginRegistry,
+    PluginValidationResult
+} from "@triliumnext/commons";
+
+/**
+ * Cache for plugin registry and user configuration
+ */
+let pluginRegistryCache: PluginRegistry | null = null;
+let userConfigCache: PluginConfiguration[] | null = null;
+let cacheTimestamp = 0;
+const CACHE_DURATION = 5 * 60 * 1000; // 5 minutes
+
+/**
+ * Get the plugin registry from server
+ */
+export async function getPluginRegistry(): Promise<PluginRegistry> {
+    const now = Date.now();
+    if (pluginRegistryCache && (now - cacheTimestamp) < CACHE_DURATION) {
+        return pluginRegistryCache;
+    }
+    
+    try {
+        pluginRegistryCache = await server.get<PluginRegistry>('ckeditor-plugins/registry');
+        cacheTimestamp = now;
+        return pluginRegistryCache;
+    } catch (error) {
+        console.error('Failed to load CKEditor plugin registry:', error);
+        throw error;
+    }
+}
+
+/**
+ * Get the user's plugin configuration from server
+ */
+export async function getUserPluginConfig(): Promise<PluginConfiguration[]> {
+    const now = Date.now();
+    if (userConfigCache && (now - cacheTimestamp) < CACHE_DURATION) {
+        return userConfigCache;
+    }
+    
+    try {
+        userConfigCache = await server.get<PluginConfiguration[]>('ckeditor-plugins/config');
+        cacheTimestamp = now;
+        return userConfigCache;
+    } catch (error) {
+        console.error('Failed to load user plugin configuration:', error);
+        throw error;
+    }
+}
+
+/**
+ * Clear the cache (call when configuration is updated)
+ */
+export function clearCache(): void {
+    pluginRegistryCache = null;
+    userConfigCache = null;
+    cacheTimestamp = 0;
+}
+
+/**
+ * Get the enabled plugins for the current user
+ */
+export async function getEnabledPlugins(): Promise<Set<string>> {
+    const userConfig = await getUserPluginConfig();
+    const enabledPlugins = new Set<string>();
+    
+    // Add all enabled user plugins
+    userConfig.forEach(config => {
+        if (config.enabled) {
+            enabledPlugins.add(config.id);
+        }
+    });
+    
+    // Always include core plugins
+    const registry = await getPluginRegistry();
+    Object.values(registry.plugins).forEach(plugin => {
+        if (plugin.isCore) {
+            enabledPlugins.add(plugin.id);
+        }
+    });
+    
+    return enabledPlugins;
+}
+
+/**
+ * Get disabled plugin names for CKEditor config
+ */
+export async function getDisabledPlugins(): Promise<string[]> {
+    try {
+        const registry = await getPluginRegistry();
+        const enabledPlugins = await getEnabledPlugins();
+        const disabledPlugins: string[] = [];
+        
+        // Find plugins that are disabled
+        Object.values(registry.plugins).forEach(plugin => {
+            if (!plugin.isCore && !enabledPlugins.has(plugin.id)) {
+                // Map plugin ID to actual CKEditor plugin names if needed
+                const pluginNames = getPluginNames(plugin.id);
+                disabledPlugins.push(...pluginNames);
+            }
+        });
+        
+        return disabledPlugins;
+    } catch (error) {
+        console.warn("Failed to get disabled plugins, returning empty list:", error);
+        return [];
+    }
+}
+
+/**
+ * Map plugin ID to actual CKEditor plugin names
+ * Some plugins might have multiple names or different names than their ID
+ */
+function getPluginNames(pluginId: string): string[] {
+    const nameMap: Record<string, string[]> = {
+        "emoji": ["EmojiMention", "EmojiPicker"],
+        "math": ["Math", "AutoformatMath"],
+        "image": ["Image", "ImageCaption", "ImageInline", "ImageResize", "ImageStyle", "ImageToolbar", "ImageUpload"],
+        "table": ["Table", "TableToolbar", "TableProperties", "TableCellProperties", "TableSelection", "TableCaption", "TableColumnResize"],
+        "font": ["Font", "FontColor", "FontBackgroundColor"],
+        "list": ["List", "ListProperties"],
+        "specialcharacters": ["SpecialCharacters", "SpecialCharactersEssentials"],
+        "findandreplace": ["FindAndReplace"],
+        "horizontalline": ["HorizontalLine"],
+        "pagebreak": ["PageBreak"],
+        "removeformat": ["RemoveFormat"],
+        "alignment": ["Alignment"],
+        "indent": ["Indent", "IndentBlock"],
+        "codeblock": ["CodeBlock"],
+        "blockquote": ["BlockQuote"],
+        "todolist": ["TodoList"],
+        "heading": ["Heading", "HeadingButtonsUI"],
+        "paragraph": ["ParagraphButtonUI"],
+        // Add more mappings as needed
+    };
+    
+    return nameMap[pluginId] || [pluginId.charAt(0).toUpperCase() + pluginId.slice(1)];
+}
+
+/**
+ * Validate the current plugin configuration
+ */
+export async function validatePluginConfiguration(): Promise<PluginValidationResult> {
+    try {
+        const userConfig = await getUserPluginConfig();
+        return await server.post<PluginValidationResult>('ckeditor-plugins/validate', {
+            plugins: userConfig
+        });
+    } catch (error) {
+        console.error('Failed to validate plugin configuration:', error);
+        return {
+            valid: false,
+            errors: [{
+                type: "missing_dependency",
+                pluginId: "unknown",
+                message: `Validation failed: ${error}`
+            }],
+            warnings: [],
+            resolvedPlugins: []
+        };
+    }
+}
+
+/**
+ * Get toolbar items that should be hidden based on disabled plugins
+ */
+export async function getHiddenToolbarItems(): Promise<string[]> {
+    const registry = await getPluginRegistry();
+    const enabledPlugins = await getEnabledPlugins();
+    const hiddenItems: string[] = [];
+    
+    Object.values(registry.plugins).forEach(plugin => {
+        if (!enabledPlugins.has(plugin.id) && plugin.toolbarItems) {
+            hiddenItems.push(...plugin.toolbarItems);
+        }
+    });
+    
+    return hiddenItems;
+}
+
+/**
+ * Update user plugin configuration
+ */
+export async function updatePluginConfiguration(plugins: PluginConfiguration[]): Promise<void> {
+    try {
+        const response = await server.put('ckeditor-plugins/config', {
+            plugins,
+            validate: true
+        });
+        
+        if (!response.success) {
+            throw new Error(response.errors?.join(", ") || "Update failed");
+        }
+        
+        // Clear cache so next requests fetch fresh data
+        clearCache();
+    } catch (error) {
+        console.error('Failed to update plugin configuration:', error);
+        throw error;
+    }
+}
+
+export default {
+    getPluginRegistry,
+    getUserPluginConfig,
+    getEnabledPlugins,
+    getDisabledPlugins,
+    getHiddenToolbarItems,
+    validatePluginConfiguration,
+    updatePluginConfiguration,
+    clearCache
+};
\ No newline at end of file
diff --git a/apps/client/src/translations/en/translation.json b/apps/client/src/translations/en/translation.json
index 6a7a966c96..c149eab007 100644
--- a/apps/client/src/translations/en/translation.json
+++ b/apps/client/src/translations/en/translation.json
@@ -1814,6 +1814,43 @@
       "multiline-toolbar": "Display the toolbar on multiple lines if it doesn't fit."
     }
   },
+  "ckeditor_plugins": {
+    "title": "Editor Plugins",
+    "description": "Configure which CKEditor plugins are enabled. Changes take effect when the editor is reloaded.",
+    "loading": "Loading plugin configuration...",
+    "load_failed": "Failed to load plugin configuration.",
+    "load_error": "Error loading plugins",
+    "retry": "Retry",
+    "category_formatting": "Text Formatting",
+    "category_structure": "Document Structure",
+    "category_media": "Media & Files",
+    "category_tables": "Tables",
+    "category_advanced": "Advanced Features",
+    "category_trilium": "Trilium Features",
+    "category_external": "External Plugins",
+    "stats_enabled": "Enabled",
+    "stats_total": "Total",
+    "stats_core": "Core",
+    "stats_premium": "Premium",
+    "no_license": "no license",
+    "premium": "Premium",
+    "premium_required": "Requires premium CKEditor license",
+    "has_dependencies": "Dependencies",
+    "depends_on": "Depends on",
+    "toolbar_items": "Toolbar items",
+    "validate": "Validate",
+    "validation_error": "Validation failed",
+    "validation_errors": "Configuration Errors:",
+    "validation_warnings": "Configuration Warnings:",
+    "save": "Save Changes",
+    "save_success": "Plugin configuration saved successfully",
+    "save_error": "Failed to save configuration",
+    "reload_editor_notice": "Please reload any open text notes to apply changes",
+    "reset_defaults": "Reset to Defaults",
+    "reset_confirm": "Are you sure you want to reset all plugin settings to their default values?",
+    "reset_success": "Plugin configuration reset to defaults",
+    "reset_error": "Failed to reset configuration"
+  },
   "electron_context_menu": {
     "add-term-to-dictionary": "Add \"{{term}}\" to dictionary",
     "cut": "Cut",
diff --git a/apps/client/src/widgets/type_widgets/ckeditor/config.ts b/apps/client/src/widgets/type_widgets/ckeditor/config.ts
index 4eb15e913c..f12a6dde5f 100644
--- a/apps/client/src/widgets/type_widgets/ckeditor/config.ts
+++ b/apps/client/src/widgets/type_widgets/ckeditor/config.ts
@@ -13,6 +13,7 @@ import noteAutocompleteService, { type Suggestion } from "../../../services/note
 import mimeTypesService from "../../../services/mime_types.js";
 import { normalizeMimeTypeForCKEditor } from "@triliumnext/commons";
 import { buildToolbarConfig } from "./toolbar.js";
+import ckeditorPluginConfigService from "../../../services/ckeditor_plugin_config.js";
 
 export const OPEN_SOURCE_LICENSE_KEY = "GPL";
 
@@ -164,7 +165,7 @@ export async function buildConfig(opts: BuildEditorOptions): Promise<EditorConfi
         },
         // This value must be kept in sync with the language defined in webpack.config.js.
         language: "en",
-        removePlugins: getDisabledPlugins()
+        removePlugins: await getDisabledPlugins()
     };
 
     // Set up content language.
@@ -203,9 +204,11 @@ export async function buildConfig(opts: BuildEditorOptions): Promise<EditorConfi
         ];
     }
 
+    const toolbarConfig = await buildToolbarConfig(opts.isClassicEditor);
+    
     return {
         ...config,
-        ...buildToolbarConfig(opts.isClassicEditor)
+        ...toolbarConfig
     };
 }
 
@@ -237,9 +240,18 @@ function getLicenseKey() {
     return premiumLicenseKey;
 }
 
-function getDisabledPlugins() {
+async function getDisabledPlugins() {
     let disabledPlugins: string[] = [];
 
+    // Check user's plugin configuration
+    try {
+        const userDisabledPlugins = await ckeditorPluginConfigService.getDisabledPlugins();
+        disabledPlugins.push(...userDisabledPlugins);
+    } catch (error) {
+        console.warn("Failed to load user plugin configuration, using defaults:", error);
+    }
+
+    // Legacy emoji setting override
     if (options.get("textNoteEmojiCompletionEnabled") !== "true") {
         disabledPlugins.push("EmojiMention");
     }
diff --git a/apps/client/src/widgets/type_widgets/ckeditor/toolbar.ts b/apps/client/src/widgets/type_widgets/ckeditor/toolbar.ts
index ad83baab6c..89f9853bb3 100644
--- a/apps/client/src/widgets/type_widgets/ckeditor/toolbar.ts
+++ b/apps/client/src/widgets/type_widgets/ckeditor/toolbar.ts
@@ -1,33 +1,73 @@
 import utils from "../../../services/utils.js";
 import options from "../../../services/options.js";
+import ckeditorPluginConfigService from "../../../services/ckeditor_plugin_config.js";
 
 const TEXT_FORMATTING_GROUP = {
     label: "Text formatting",
     icon: "text"
 };
 
-export function buildToolbarConfig(isClassicToolbar: boolean) {
+export async function buildToolbarConfig(isClassicToolbar: boolean) {
+    const hiddenItems = await getHiddenToolbarItems();
+    
     if (utils.isMobile()) {
-        return buildMobileToolbar();
+        return buildMobileToolbar(hiddenItems);
     } else if (isClassicToolbar) {
         const multilineToolbar = utils.isDesktop() && options.get("textNoteEditorMultilineToolbar") === "true";
-        return buildClassicToolbar(multilineToolbar);
+        return buildClassicToolbar(multilineToolbar, hiddenItems);
     } else {
-        return buildFloatingToolbar();
+        return buildFloatingToolbar(hiddenItems);
     }
 }
 
-export function buildMobileToolbar() {
-    const classicConfig = buildClassicToolbar(false);
+async function getHiddenToolbarItems(): Promise<Set<string>> {
+    try {
+        const hiddenItems = await ckeditorPluginConfigService.getHiddenToolbarItems();
+        return new Set(hiddenItems);
+    } catch (error) {
+        console.warn("Failed to get hidden toolbar items, using empty set:", error);
+        return new Set();
+    }
+}
+
+/**
+ * Filter toolbar items based on disabled plugins
+ */
+function filterToolbarItems(items: (string | object)[], hiddenItems: Set<string>): (string | object)[] {
+    return items.filter(item => {
+        if (typeof item === 'string') {
+            // Don't hide separators
+            if (item === '|') return true;
+            // Check if this item should be hidden
+            return !hiddenItems.has(item);
+        } else if (typeof item === 'object' && item !== null && 'items' in item) {
+            // Filter nested items recursively
+            const nestedItem = item as { items: (string | object)[] };
+            const filteredNested = filterToolbarItems(nestedItem.items, hiddenItems);
+            // Only keep the group if it has at least one non-separator item
+            const hasNonSeparatorItems = filteredNested.some(subItem => 
+                typeof subItem === 'string' ? subItem !== '|' : true
+            );
+            if (hasNonSeparatorItems) {
+                return { ...item, items: filteredNested };
+            }
+            return null;
+        }
+        return true;
+    }).filter(item => item !== null) as (string | object)[];
+}
+
+export function buildMobileToolbar(hiddenItems: Set<string>) {
+    const classicConfig = buildClassicToolbar(false, hiddenItems);
     const items: string[] = [];
 
     for (const item of classicConfig.toolbar.items) {
         if (typeof item === "object" && "items" in item) {
-            for (const subitem of item.items) {
+            for (const subitem of (item as any).items) {
                 items.push(subitem);
             }
         } else {
-            items.push(item);
+            items.push(item as string);
         }
     }
 
@@ -40,110 +80,115 @@ export function buildMobileToolbar() {
     };
 }
 
-export function buildClassicToolbar(multilineToolbar: boolean) {
+export function buildClassicToolbar(multilineToolbar: boolean, hiddenItems: Set<string>) {
     // For nested toolbars, refer to https://ckeditor.com/docs/ckeditor5/latest/getting-started/setup/toolbar.html#grouping-toolbar-items-in-dropdowns-nested-toolbars.
+    const items = [
+        "heading",
+        "fontSize",
+        "|",
+        "bold",
+        "italic",
+        {
+            ...TEXT_FORMATTING_GROUP,
+            items: ["underline", "strikethrough", "|", "superscript", "subscript", "|", "kbd"]
+        },
+        "|",
+        "fontColor",
+        "fontBackgroundColor",
+        "removeFormat",
+        "|",
+        "bulletedList",
+        "numberedList",
+        "todoList",
+        "|",
+        "blockQuote",
+        "admonition",
+        "insertTable",
+        "|",
+        "code",
+        "codeBlock",
+        "|",
+        "footnote",
+        {
+            label: "Insert",
+            icon: "plus",
+            items: ["imageUpload", "|", "link", "bookmark", "internallink", "includeNote", "|", "specialCharacters", "emoji", "math", "mermaid", "horizontalLine", "pageBreak", "dateTime"]
+        },
+        "|",
+        "alignment",
+        "outdent",
+        "indent",
+        "|",
+        "insertTemplate",
+        "markdownImport",
+        "cuttonote",
+        "findAndReplace"
+    ];
+
     return {
         toolbar: {
-            items: [
-                "heading",
-                "fontSize",
-                "|",
-                "bold",
-                "italic",
-                {
-                    ...TEXT_FORMATTING_GROUP,
-                    items: ["underline", "strikethrough", "|", "superscript", "subscript", "|", "kbd"]
-                },
-                "|",
-                "fontColor",
-                "fontBackgroundColor",
-                "removeFormat",
-                "|",
-                "bulletedList",
-                "numberedList",
-                "todoList",
-                "|",
-                "blockQuote",
-                "admonition",
-                "insertTable",
-                "|",
-                "code",
-                "codeBlock",
-                "|",
-                "footnote",
-                {
-                    label: "Insert",
-                    icon: "plus",
-                    items: ["imageUpload", "|", "link", "bookmark", "internallink", "includeNote", "|", "specialCharacters", "emoji", "math", "mermaid", "horizontalLine", "pageBreak", "dateTime"]
-                },
-                "|",
-                "alignment",
-                "outdent",
-                "indent",
-                "|",
-                "insertTemplate",
-                "markdownImport",
-                "cuttonote",
-                "findAndReplace"
-            ],
+            items: filterToolbarItems(items, hiddenItems),
             shouldNotGroupWhenFull: multilineToolbar
         }
     };
 }
 
-export function buildFloatingToolbar() {
+export function buildFloatingToolbar(hiddenItems: Set<string>) {
+    const toolbarItems = [
+        "fontSize",
+        "bold",
+        "italic",
+        "underline",
+        {
+            ...TEXT_FORMATTING_GROUP,
+            items: [ "strikethrough", "|", "superscript", "subscript", "|", "kbd" ]
+        },
+        "|",
+        "fontColor",
+        "fontBackgroundColor",
+        "|",
+        "code",
+        "link",
+        "bookmark",
+        "removeFormat",
+        "internallink",
+        "cuttonote"
+    ];
+
+    const blockToolbarItems = [
+        "heading",
+        "|",
+        "bulletedList",
+        "numberedList",
+        "todoList",
+        "|",
+        "blockQuote",
+        "admonition",
+        "codeBlock",
+        "insertTable",
+        "footnote",
+        {
+            label: "Insert",
+            icon: "plus",
+            items: ["link", "bookmark", "internallink", "includeNote", "|", "math", "mermaid", "horizontalLine", "pageBreak", "dateTime"]
+        },
+        "|",
+        "alignment",
+        "outdent",
+        "indent",
+        "|",
+        "insertTemplate",
+        "imageUpload",
+        "markdownImport",
+        "specialCharacters",
+        "emoji",
+        "findAndReplace"
+    ];
+
     return {
         toolbar: {
-            items: [
-                "fontSize",
-                "bold",
-                "italic",
-                "underline",
-                {
-                    ...TEXT_FORMATTING_GROUP,
-                    items: [ "strikethrough", "|", "superscript", "subscript", "|", "kbd" ]
-                },
-                "|",
-                "fontColor",
-                "fontBackgroundColor",
-                "|",
-                "code",
-                "link",
-                "bookmark",
-                "removeFormat",
-                "internallink",
-                "cuttonote"
-            ]
+            items: filterToolbarItems(toolbarItems, hiddenItems)
         },
-
-        blockToolbar: [
-            "heading",
-            "|",
-            "bulletedList",
-            "numberedList",
-            "todoList",
-            "|",
-            "blockQuote",
-            "admonition",
-            "codeBlock",
-            "insertTable",
-            "footnote",
-            {
-                label: "Insert",
-                icon: "plus",
-                items: ["link", "bookmark", "internallink", "includeNote", "|", "math", "mermaid", "horizontalLine", "pageBreak", "dateTime"]
-            },
-            "|",
-            "alignment",
-            "outdent",
-            "indent",
-            "|",
-            "insertTemplate",
-            "imageUpload",
-            "markdownImport",
-            "specialCharacters",
-            "emoji",
-            "findAndReplace"
-        ]
+        blockToolbar: filterToolbarItems(blockToolbarItems, hiddenItems)
     };
 }
diff --git a/apps/client/src/widgets/type_widgets/content_widget.tsx b/apps/client/src/widgets/type_widgets/content_widget.tsx
index be803018f9..34ac3a4f6c 100644
--- a/apps/client/src/widgets/type_widgets/content_widget.tsx
+++ b/apps/client/src/widgets/type_widgets/content_widget.tsx
@@ -17,6 +17,7 @@ import PasswordSettings from "./options/password.jsx";
 import ShortcutSettings from "./options/shortcuts.js";
 import TextNoteSettings from "./options/text_notes.jsx";
 import CodeNoteSettings from "./options/code_notes.jsx";
+import CKEditorPluginSettings from "./options/ckeditor_plugins.jsx";
 import OtherSettings from "./options/other.jsx";
 import BackendLogWidget from "./content/backend_log.js";
 import MultiFactorAuthenticationSettings from "./options/multi_factor_authentication.js";
@@ -45,13 +46,14 @@ const TPL = /*html*/`<div class="note-detail-content-widget note-detail-printabl
     <div class="note-detail-content-widget-content"></div>
 </div>`;
 
-export type OptionPages = "_optionsAppearance" | "_optionsShortcuts" | "_optionsTextNotes" | "_optionsCodeNotes" | "_optionsImages" | "_optionsSpellcheck" | "_optionsPassword" | "_optionsMFA" | "_optionsEtapi" | "_optionsBackup" | "_optionsSync" | "_optionsAi" | "_optionsOther" | "_optionsLocalization" | "_optionsAdvanced";
+export type OptionPages = "_optionsAppearance" | "_optionsShortcuts" | "_optionsTextNotes" | "_optionsCodeNotes" | "_optionsCKEditorPlugins" | "_optionsImages" | "_optionsSpellcheck" | "_optionsPassword" | "_optionsMFA" | "_optionsEtapi" | "_optionsBackup" | "_optionsSync" | "_optionsAi" | "_optionsOther" | "_optionsLocalization" | "_optionsAdvanced";
 
 const CONTENT_WIDGETS: Record<OptionPages | "_backendLog", ((typeof NoteContextAwareWidget)[] | JSX.Element)> = {
     _optionsAppearance: <AppearanceSettings />,
     _optionsShortcuts: <ShortcutSettings />,
     _optionsTextNotes: <TextNoteSettings />,
     _optionsCodeNotes: <CodeNoteSettings />,
+    _optionsCKEditorPlugins: <CKEditorPluginSettings />,
     _optionsImages: <ImageSettings />,
     _optionsSpellcheck: <SpellcheckSettings />,
     _optionsPassword: <PasswordSettings />,
diff --git a/apps/client/src/widgets/type_widgets/options/ckeditor_plugins.tsx b/apps/client/src/widgets/type_widgets/options/ckeditor_plugins.tsx
new file mode 100644
index 0000000000..fb97d2dfac
--- /dev/null
+++ b/apps/client/src/widgets/type_widgets/options/ckeditor_plugins.tsx
@@ -0,0 +1,397 @@
+import { useEffect, useState, useCallback, useMemo } from "preact/hooks";
+import { t } from "../../../services/i18n";
+import server from "../../../services/server";
+import FormCheckbox from "../../react/FormCheckbox";
+import FormGroup from "../../react/FormGroup";
+import FormText from "../../react/FormText";
+import OptionsSection from "./components/OptionsSection";
+import Button from "../../react/Button";
+import toast from "../../../services/toast";
+import type { 
+    PluginMetadata, 
+    PluginConfiguration, 
+    PluginRegistry,
+    PluginValidationResult,
+    UpdatePluginConfigRequest,
+    UpdatePluginConfigResponse,
+    QueryPluginsResult,
+    PluginCategory
+} from "@triliumnext/commons";
+
+interface PluginStats {
+    enabled: number;
+    total: number;
+    core: number;
+    premium: number;
+    configurable: number;
+    categories: Record<string, number>;
+    hasPremiumLicense: boolean;
+}
+
+const CATEGORY_DISPLAY_NAMES: Record<PluginCategory, string> = {
+    formatting: t("ckeditor_plugins.category_formatting"),
+    structure: t("ckeditor_plugins.category_structure"),
+    media: t("ckeditor_plugins.category_media"),
+    tables: t("ckeditor_plugins.category_tables"),
+    advanced: t("ckeditor_plugins.category_advanced"),
+    trilium: t("ckeditor_plugins.category_trilium"),
+    external: t("ckeditor_plugins.category_external")
+};
+
+export default function CKEditorPluginSettings() {
+    const [pluginRegistry, setPluginRegistry] = useState<PluginRegistry | null>(null);
+    const [userConfig, setUserConfig] = useState<PluginConfiguration[]>([]);
+    const [stats, setStats] = useState<PluginStats | null>(null);
+    const [loading, setLoading] = useState(true);
+    const [saving, setSaving] = useState(false);
+    const [validationResult, setValidationResult] = useState<PluginValidationResult | null>(null);
+    const [showValidation, setShowValidation] = useState(false);
+
+    // Load initial data
+    useEffect(() => {
+        loadData();
+    }, []);
+
+    const loadData = useCallback(async () => {
+        setLoading(true);
+        try {
+            const [registry, config, statsData] = await Promise.all([
+                server.get<PluginRegistry>('ckeditor-plugins/registry'),
+                server.get<PluginConfiguration[]>('ckeditor-plugins/config'),
+                server.get<PluginStats>('ckeditor-plugins/stats')
+            ]);
+            
+            setPluginRegistry(registry);
+            setUserConfig(config);
+            setStats(statsData);
+        } catch (error) {
+            toast.showError(`${t("ckeditor_plugins.load_error")}: ${error}`);
+        } finally {
+            setLoading(false);
+        }
+    }, []);
+
+    // Organize plugins by category
+    const pluginsByCategory = useMemo(() => {
+        if (!pluginRegistry) return {};
+        
+        const categories: Record<PluginCategory, PluginMetadata[]> = {
+            formatting: [],
+            structure: [],
+            media: [],
+            tables: [],
+            advanced: [],
+            trilium: [],
+            external: []
+        };
+
+        Object.values(pluginRegistry.plugins).forEach(plugin => {
+            if (!plugin.isCore) { // Don't show core plugins in settings
+                categories[plugin.category].push(plugin);
+            }
+        });
+
+        // Sort plugins within each category by name
+        Object.keys(categories).forEach(category => {
+            categories[category as PluginCategory].sort((a, b) => a.name.localeCompare(b.name));
+        });
+
+        return categories;
+    }, [pluginRegistry]);
+
+    // Get enabled status for a plugin
+    const isPluginEnabled = useCallback((pluginId: string): boolean => {
+        return userConfig.find(config => config.id === pluginId)?.enabled ?? false;
+    }, [userConfig]);
+
+    // Toggle plugin enabled state
+    const togglePlugin = useCallback((pluginId: string) => {
+        setUserConfig(prev => prev.map(config => 
+            config.id === pluginId 
+                ? { ...config, enabled: !config.enabled }
+                : config
+        ));
+    }, []);
+
+    // Validate current configuration
+    const validateConfig = useCallback(async () => {
+        if (!userConfig.length) return;
+        
+        try {
+            const result = await server.post<PluginValidationResult>('ckeditor-plugins/validate', {
+                plugins: userConfig
+            });
+            setValidationResult(result);
+            setShowValidation(true);
+            return result;
+        } catch (error) {
+            toast.showError(`${t("ckeditor_plugins.validation_error")}: ${error}`);
+            return null;
+        }
+    }, [userConfig]);
+
+    // Save configuration
+    const saveConfiguration = useCallback(async () => {
+        setSaving(true);
+        setShowValidation(false);
+        
+        try {
+            const request: UpdatePluginConfigRequest = {
+                plugins: userConfig,
+                validate: true
+            };
+
+            const response = await server.put<UpdatePluginConfigResponse>('ckeditor-plugins/config', request);
+            
+            if (response.success) {
+                toast.showMessage(t("ckeditor_plugins.save_success"));
+                await loadData(); // Reload stats
+                
+                // Notify user that editor reload might be needed
+                toast.showMessage(t("ckeditor_plugins.reload_editor_notice"), {
+                    timeout: 5000
+                });
+            } else {
+                setValidationResult(response.validation);
+                setShowValidation(true);
+                toast.showError(`${t("ckeditor_plugins.save_error")}: ${response.errors?.join(", ")}`);
+            }
+        } catch (error) {
+            toast.showError(`${t("ckeditor_plugins.save_error")}: ${error}`);
+        } finally {
+            setSaving(false);
+        }
+    }, [userConfig, loadData]);
+
+    // Reset to defaults
+    const resetToDefaults = useCallback(async () => {
+        if (!confirm(t("ckeditor_plugins.reset_confirm"))) return;
+        
+        setSaving(true);
+        try {
+            const response = await server.post<UpdatePluginConfigResponse>('ckeditor-plugins/reset');
+            if (response.success) {
+                setUserConfig(response.plugins);
+                toast.showMessage(t("ckeditor_plugins.reset_success"));
+                await loadData();
+            } else {
+                toast.showError(`${t("ckeditor_plugins.reset_error")}: ${response.errors?.join(", ")}`);
+            }
+        } catch (error) {
+            toast.showError(`${t("ckeditor_plugins.reset_error")}: ${error}`);
+        } finally {
+            setSaving(false);
+        }
+    }, [loadData]);
+
+    if (loading) {
+        return (
+            <OptionsSection title={t("ckeditor_plugins.title")}>
+                <FormText>{t("ckeditor_plugins.loading")}</FormText>
+            </OptionsSection>
+        );
+    }
+
+    if (!pluginRegistry || !stats) {
+        return (
+            <OptionsSection title={t("ckeditor_plugins.title")}>
+                <FormText>{t("ckeditor_plugins.load_failed")}</FormText>
+                <Button text={t("ckeditor_plugins.retry")} onClick={loadData} />
+            </OptionsSection>
+        );
+    }
+
+    return (
+        <div>
+            <OptionsSection title={t("ckeditor_plugins.title")}>
+                <FormText>{t("ckeditor_plugins.description")}</FormText>
+                
+                {/* Stats overview */}
+                <div className="plugin-stats" style={{ 
+                    backgroundColor: 'var(--accented-background-color)', 
+                    padding: '12px', 
+                    borderRadius: '4px',
+                    marginBottom: '20px'
+                }}>
+                    <div className="row">
+                        <div className="col-md-3">
+                            <strong>{t("ckeditor_plugins.stats_enabled")}</strong><br />
+                            <span style={{ fontSize: '1.2em', color: 'var(--main-text-color)' }}>
+                                {stats.enabled}/{stats.configurable}
+                            </span>
+                        </div>
+                        <div className="col-md-3">
+                            <strong>{t("ckeditor_plugins.stats_total")}</strong><br />
+                            <span style={{ fontSize: '1.2em', color: 'var(--main-text-color)' }}>
+                                {stats.total}
+                            </span>
+                        </div>
+                        <div className="col-md-3">
+                            <strong>{t("ckeditor_plugins.stats_core")}</strong><br />
+                            <span style={{ fontSize: '1.2em', color: 'var(--main-text-color)' }}>
+                                {stats.core}
+                            </span>
+                        </div>
+                        <div className="col-md-3">
+                            <strong>{t("ckeditor_plugins.stats_premium")}</strong><br />
+                            <span style={{ fontSize: '1.2em', color: stats.hasPremiumLicense ? 'var(--success-color)' : 'var(--muted-text-color)' }}>
+                                {stats.premium} {!stats.hasPremiumLicense && `(${t("ckeditor_plugins.no_license")})`}
+                            </span>
+                        </div>
+                    </div>
+                </div>
+
+                {/* Validation results */}
+                {showValidation && validationResult && (
+                    <div className="validation-results" style={{ marginBottom: '20px' }}>
+                        {!validationResult.valid && (
+                            <div className="alert alert-danger">
+                                <strong>{t("ckeditor_plugins.validation_errors")}</strong>
+                                <ul>
+                                    {validationResult.errors.map((error, index) => (
+                                        <li key={index}>{error.message}</li>
+                                    ))}
+                                </ul>
+                            </div>
+                        )}
+                        {validationResult.warnings.length > 0 && (
+                            <div className="alert alert-warning">
+                                <strong>{t("ckeditor_plugins.validation_warnings")}</strong>
+                                <ul>
+                                    {validationResult.warnings.map((warning, index) => (
+                                        <li key={index}>{warning.message}</li>
+                                    ))}
+                                </ul>
+                            </div>
+                        )}
+                    </div>
+                )}
+
+                {/* Action buttons */}
+                <div className="plugin-actions" style={{ marginBottom: '20px' }}>
+                    <Button 
+                        text={t("ckeditor_plugins.validate")} 
+                        onClick={validateConfig}
+                        disabled={saving}
+                        className="btn-secondary"
+                        size="small"
+                    />
+                    <Button 
+                        text={t("ckeditor_plugins.save")} 
+                        onClick={saveConfiguration}
+                        disabled={saving}
+                        className="btn-primary"
+                        size="small"
+                        style={{ marginLeft: '10px' }}
+                    />
+                    <Button 
+                        text={t("ckeditor_plugins.reset_defaults")} 
+                        onClick={resetToDefaults}
+                        disabled={saving}
+                        className="btn-secondary"
+                        size="small"
+                        style={{ marginLeft: '10px' }}
+                    />
+                </div>
+            </OptionsSection>
+
+            {/* Plugin categories */}
+            {Object.entries(pluginsByCategory).map(([categoryKey, plugins]) => {
+                if (plugins.length === 0) return null;
+                
+                const category = categoryKey as PluginCategory;
+                return (
+                    <OptionsSection key={category} title={CATEGORY_DISPLAY_NAMES[category]} level={2}>
+                        <div className="plugin-category">
+                            {plugins.map(plugin => (
+                                <PluginConfigItem 
+                                    key={plugin.id}
+                                    plugin={plugin}
+                                    enabled={isPluginEnabled(plugin.id)}
+                                    onToggle={() => togglePlugin(plugin.id)}
+                                    hasPremiumLicense={stats.hasPremiumLicense}
+                                />
+                            ))}
+                        </div>
+                    </OptionsSection>
+                );
+            })}
+        </div>
+    );
+}
+
+interface PluginConfigItemProps {
+    plugin: PluginMetadata;
+    enabled: boolean;
+    onToggle: () => void;
+    hasPremiumLicense: boolean;
+}
+
+function PluginConfigItem({ plugin, enabled, onToggle, hasPremiumLicense }: PluginConfigItemProps) {
+    const canEnable = !plugin.requiresPremium || hasPremiumLicense;
+    
+    return (
+        <FormGroup name={`plugin-${plugin.id}`} style={{ marginBottom: '15px' }}>
+            <div className="plugin-item" style={{
+                display: 'flex',
+                alignItems: 'flex-start',
+                opacity: canEnable ? 1 : 0.6
+            }}>
+                <FormCheckbox
+                    label=""
+                    currentValue={enabled && canEnable}
+                    onChange={canEnable ? onToggle : undefined}
+                    disabled={!canEnable}
+                    containerStyle={{ marginRight: '10px', marginTop: '2px' }}
+                />
+                <div style={{ flex: 1 }}>
+                    <div style={{ 
+                        fontWeight: 'bold',
+                        marginBottom: '4px',
+                        display: 'flex',
+                        alignItems: 'center',
+                        gap: '8px'
+                    }}>
+                        <span>{plugin.name}</span>
+                        {plugin.requiresPremium && (
+                            <span className="badge badge-warning" style={{ fontSize: '0.75em' }}>
+                                {t("ckeditor_plugins.premium")}
+                            </span>
+                        )}
+                        {plugin.dependencies.length > 0 && (
+                            <span className="badge badge-info" style={{ fontSize: '0.75em' }}>
+                                {t("ckeditor_plugins.has_dependencies")}
+                            </span>
+                        )}
+                    </div>
+                    <div style={{ 
+                        fontSize: '0.9em', 
+                        color: 'var(--muted-text-color)',
+                        marginBottom: '4px'
+                    }}>
+                        {plugin.description}
+                    </div>
+                    {plugin.dependencies.length > 0 && (
+                        <div style={{ fontSize: '0.8em', color: 'var(--muted-text-color)' }}>
+                            {t("ckeditor_plugins.depends_on")}: {plugin.dependencies.join(', ')}
+                        </div>
+                    )}
+                    {plugin.toolbarItems && plugin.toolbarItems.length > 0 && (
+                        <div style={{ fontSize: '0.8em', color: 'var(--muted-text-color)' }}>
+                            {t("ckeditor_plugins.toolbar_items")}: {plugin.toolbarItems.join(', ')}
+                        </div>
+                    )}
+                    {!canEnable && (
+                        <div style={{ 
+                            fontSize: '0.8em', 
+                            color: 'var(--error-color)',
+                            fontStyle: 'italic'
+                        }}>
+                            {t("ckeditor_plugins.premium_required")}
+                        </div>
+                    )}
+                </div>
+            </div>
+        </FormGroup>
+    );
+}
\ No newline at end of file
diff --git a/apps/server/src/routes/api/ckeditor_plugins.ts b/apps/server/src/routes/api/ckeditor_plugins.ts
new file mode 100644
index 0000000000..556598f427
--- /dev/null
+++ b/apps/server/src/routes/api/ckeditor_plugins.ts
@@ -0,0 +1,388 @@
+/**
+ * @module CKEditor Plugins API
+ * 
+ * This module provides REST endpoints for managing CKEditor plugin configuration
+ * in Trilium Notes. It handles plugin enablement, validation, and user preferences.
+ */
+
+import options from "../../services/options.js";
+import type { Request, Response } from "express";
+import type { 
+    PluginConfiguration, 
+    PluginRegistry, 
+    PluginValidationResult, 
+    UpdatePluginConfigRequest,
+    UpdatePluginConfigResponse,
+    QueryPluginsOptions,
+    QueryPluginsResult,
+    PluginMetadata
+} from "@triliumnext/commons";
+import { PLUGIN_REGISTRY, getPluginMetadata, getPluginsByCategory, getConfigurablePlugins } from "@triliumnext/ckeditor5";
+import log from "../../services/log.js";
+
+/**
+ * Get the complete plugin registry with metadata
+ */
+export function getPluginRegistry(): PluginRegistry {
+    return PLUGIN_REGISTRY;
+}
+
+/**
+ * Get current user's plugin configuration
+ */
+export function getUserPluginConfig(): PluginConfiguration[] {
+    const enabledPluginsJson = options.getOptionOrNull("ckeditorEnabledPlugins");
+    
+    if (!enabledPluginsJson) {
+        // Return default configuration if none exists
+        return getDefaultPluginConfiguration();
+    }
+
+    try {
+        const enabledPlugins = JSON.parse(enabledPluginsJson) as string[];
+        
+        // Convert to PluginConfiguration array
+        return Object.keys(PLUGIN_REGISTRY.plugins).map(pluginId => ({
+            id: pluginId,
+            enabled: enabledPlugins.includes(pluginId)
+        }));
+    } catch (error) {
+        log.error(`Failed to parse CKEditor plugin configuration: ${error}`);
+        return getDefaultPluginConfiguration();
+    }
+}
+
+/**
+ * Get default plugin configuration (all non-premium plugins enabled)
+ */
+function getDefaultPluginConfiguration(): PluginConfiguration[] {
+    return Object.values(PLUGIN_REGISTRY.plugins).map(plugin => ({
+        id: plugin.id,
+        enabled: plugin.defaultEnabled && !plugin.requiresPremium
+    }));
+}
+
+/**
+ * Update user's plugin configuration
+ */
+export function updateUserPluginConfig(request: UpdatePluginConfigRequest): UpdatePluginConfigResponse {
+    const { plugins, validate = true } = request;
+    
+    try {
+        // Validate if requested
+        let validation: PluginValidationResult | undefined;
+        if (validate) {
+            validation = validatePluginConfiguration(plugins);
+            if (!validation.valid) {
+                return {
+                    success: false,
+                    validation,
+                    plugins: [],
+                    errors: validation.errors.map(err => err.message)
+                };
+            }
+        }
+
+        // Save configuration
+        const enabledPluginIds = plugins
+            .filter(plugin => plugin.enabled)
+            .map(plugin => plugin.id);
+
+        options.setOption("ckeditorEnabledPlugins", JSON.stringify(enabledPluginIds));
+
+        log.info(`Updated CKEditor plugin configuration: ${enabledPluginIds.length} plugins enabled`);
+
+        return {
+            success: true,
+            validation,
+            plugins: plugins,
+            errors: []
+        };
+    } catch (error) {
+        log.error(`Failed to update CKEditor plugin configuration: ${error}`);
+        return {
+            success: false,
+            plugins: [],
+            errors: [`Failed to update configuration: ${error}`]
+        };
+    }
+}
+
+/**
+ * Query plugins with filtering options
+ */
+export function queryPlugins(options: QueryPluginsOptions = {}): QueryPluginsResult {
+    const { category, enabled, coreOnly, includeConfig } = options;
+    
+    let plugins = Object.values(PLUGIN_REGISTRY.plugins);
+
+    // Apply filters
+    if (category) {
+        plugins = plugins.filter(plugin => plugin.category === category);
+    }
+
+    if (coreOnly === true) {
+        plugins = plugins.filter(plugin => plugin.isCore);
+    } else if (coreOnly === false) {
+        plugins = plugins.filter(plugin => !plugin.isCore);
+    }
+
+    // Get user configuration if requested or filtering by enabled status
+    let userConfig: PluginConfiguration[] = [];
+    if (includeConfig || enabled !== undefined) {
+        userConfig = getUserPluginConfig();
+    }
+
+    // Filter by enabled status
+    if (enabled !== undefined) {
+        const enabledPluginIds = new Set(
+            userConfig.filter(config => config.enabled).map(config => config.id)
+        );
+        plugins = plugins.filter(plugin => 
+            enabled ? enabledPluginIds.has(plugin.id) : !enabledPluginIds.has(plugin.id)
+        );
+    }
+
+    // Add user configuration if requested
+    const result = plugins.map(plugin => {
+        if (includeConfig) {
+            const config = userConfig.find(config => config.id === plugin.id);
+            return {
+                ...plugin,
+                enabled: config?.enabled ?? false,
+                config: config?.config
+            };
+        }
+        return plugin;
+    });
+
+    // Get available categories
+    const categories = [...new Set(Object.values(PLUGIN_REGISTRY.plugins).map(plugin => plugin.category))];
+
+    return {
+        plugins: result,
+        totalCount: Object.keys(PLUGIN_REGISTRY.plugins).length,
+        categories: categories as any[]
+    };
+}
+
+/**
+ * Validate plugin configuration for dependencies and conflicts
+ */
+export function validatePluginConfiguration(plugins: PluginConfiguration[]): PluginValidationResult {
+    const errors: any[] = [];
+    const warnings: any[] = [];
+    const enabledPlugins = new Set(plugins.filter(p => p.enabled).map(p => p.id));
+    const resolvedPlugins = new Set<string>();
+
+    // Check each enabled plugin
+    for (const plugin of plugins.filter(p => p.enabled)) {
+        const metadata = getPluginMetadata(plugin.id);
+        
+        if (!metadata) {
+            errors.push({
+                type: "missing_dependency",
+                pluginId: plugin.id,
+                message: `Plugin '${plugin.id}' not found in registry`
+            });
+            continue;
+        }
+
+        // Check premium requirements
+        if (metadata.requiresPremium && !hasPremiumLicense()) {
+            errors.push({
+                type: "premium_required",
+                pluginId: plugin.id,
+                message: `Plugin '${metadata.name}' requires a premium CKEditor license`
+            });
+            continue;
+        }
+
+        // Check dependencies
+        for (const depId of metadata.dependencies) {
+            if (!enabledPlugins.has(depId)) {
+                const depMetadata = getPluginMetadata(depId);
+                errors.push({
+                    type: "missing_dependency",
+                    pluginId: plugin.id,
+                    message: `Plugin '${metadata.name}' requires '${depMetadata?.name || depId}' to be enabled`,
+                    details: { dependency: depId }
+                });
+            }
+        }
+
+        // Check conflicts
+        for (const conflictId of metadata.conflicts) {
+            if (enabledPlugins.has(conflictId)) {
+                const conflictMetadata = getPluginMetadata(conflictId);
+                errors.push({
+                    type: "plugin_conflict",
+                    pluginId: plugin.id,
+                    message: `Plugin '${metadata.name}' conflicts with '${conflictMetadata?.name || conflictId}'`,
+                    details: { conflict: conflictId }
+                });
+            }
+        }
+
+        resolvedPlugins.add(plugin.id);
+    }
+
+    // Add core plugins to resolved list (they're always enabled)
+    for (const plugin of Object.values(PLUGIN_REGISTRY.plugins)) {
+        if (plugin.isCore) {
+            resolvedPlugins.add(plugin.id);
+        }
+    }
+
+    // Check for circular dependencies (simplified check)
+    const visited = new Set<string>();
+    const visiting = new Set<string>();
+
+    function hasCircularDependency(pluginId: string): boolean {
+        if (visiting.has(pluginId)) {
+            return true;
+        }
+        if (visited.has(pluginId)) {
+            return false;
+        }
+
+        visiting.add(pluginId);
+        const metadata = getPluginMetadata(pluginId);
+        
+        if (metadata) {
+            for (const depId of metadata.dependencies) {
+                if (enabledPlugins.has(depId) && hasCircularDependency(depId)) {
+                    return true;
+                }
+            }
+        }
+
+        visiting.delete(pluginId);
+        visited.add(pluginId);
+        return false;
+    }
+
+    for (const pluginId of enabledPlugins) {
+        if (hasCircularDependency(pluginId)) {
+            errors.push({
+                type: "circular_dependency",
+                pluginId: pluginId,
+                message: `Circular dependency detected for plugin '${getPluginMetadata(pluginId)?.name || pluginId}'`
+            });
+        }
+    }
+
+    return {
+        valid: errors.length === 0,
+        errors,
+        warnings,
+        resolvedPlugins: Array.from(resolvedPlugins)
+    };
+}
+
+/**
+ * Check if user has premium CKEditor license
+ */
+function hasPremiumLicense(): boolean {
+    // This would check the actual license key
+    // For now, assume no premium license
+    return process.env.VITE_CKEDITOR_KEY !== undefined && process.env.VITE_CKEDITOR_KEY !== "";
+}
+
+/**
+ * Reset plugin configuration to defaults
+ */
+export function resetPluginConfigToDefaults(): UpdatePluginConfigResponse {
+    const defaultConfig = getDefaultPluginConfiguration();
+    
+    return updateUserPluginConfig({
+        plugins: defaultConfig,
+        validate: false
+    });
+}
+
+/**
+ * Get plugin statistics
+ */
+export function getPluginStats() {
+    const userConfig = getUserPluginConfig();
+    const enabledCount = userConfig.filter(p => p.enabled).length;
+    const totalCount = Object.keys(PLUGIN_REGISTRY.plugins).length;
+    const coreCount = Object.values(PLUGIN_REGISTRY.plugins).filter(p => p.isCore).length;
+    const premiumCount = Object.values(PLUGIN_REGISTRY.plugins).filter(p => p.requiresPremium).length;
+
+    const categoryCounts = Object.values(PLUGIN_REGISTRY.plugins).reduce((acc, plugin) => {
+        acc[plugin.category] = (acc[plugin.category] || 0) + 1;
+        return acc;
+    }, {} as Record<string, number>);
+
+    return {
+        enabled: enabledCount,
+        total: totalCount,
+        core: coreCount,
+        premium: premiumCount,
+        configurable: totalCount - coreCount,
+        categories: categoryCounts,
+        hasPremiumLicense: hasPremiumLicense()
+    };
+}
+
+// Express route handlers
+function getPluginRegistryHandler(req: Request, res: Response) {
+    res.json(getPluginRegistry());
+}
+
+function getUserPluginConfigHandler(req: Request, res: Response) {
+    res.json(getUserPluginConfig());
+}
+
+function updateUserPluginConfigHandler(req: Request, res: Response) {
+    const updateRequest: UpdatePluginConfigRequest = req.body;
+    const result = updateUserPluginConfig(updateRequest);
+    
+    if (!result.success) {
+        res.status(400).json(result);
+    } else {
+        res.json(result);
+    }
+}
+
+function queryPluginsHandler(req: Request, res: Response) {
+    const queryOptions: QueryPluginsOptions = {
+        category: req.query.category as string,
+        enabled: req.query.enabled === 'true' ? true : req.query.enabled === 'false' ? false : undefined,
+        coreOnly: req.query.coreOnly === 'true' ? true : req.query.coreOnly === 'false' ? false : undefined,
+        includeConfig: req.query.includeConfig === 'true'
+    };
+    
+    res.json(queryPlugins(queryOptions));
+}
+
+function validatePluginConfigurationHandler(req: Request, res: Response) {
+    const plugins: PluginConfiguration[] = req.body.plugins || [];
+    res.json(validatePluginConfiguration(plugins));
+}
+
+function resetPluginConfigToDefaultsHandler(req: Request, res: Response) {
+    const result = resetPluginConfigToDefaults();
+    
+    if (!result.success) {
+        res.status(400).json(result);
+    } else {
+        res.json(result);
+    }
+}
+
+function getPluginStatsHandler(req: Request, res: Response) {
+    res.json(getPluginStats());
+}
+
+export default {
+    getPluginRegistry: getPluginRegistryHandler,
+    getUserPluginConfig: getUserPluginConfigHandler,
+    updateUserPluginConfig: updateUserPluginConfigHandler,
+    queryPlugins: queryPluginsHandler,
+    validatePluginConfiguration: validatePluginConfigurationHandler,
+    resetPluginConfigToDefaults: resetPluginConfigToDefaultsHandler,
+    getPluginStats: getPluginStatsHandler
+};
\ No newline at end of file
diff --git a/apps/server/src/routes/api/options.ts b/apps/server/src/routes/api/options.ts
index 290dd57430..521ae2c96c 100644
--- a/apps/server/src/routes/api/options.ts
+++ b/apps/server/src/routes/api/options.ts
@@ -97,6 +97,7 @@ const ALLOWED_OPTIONS = new Set<OptionNames>([
     "showLoginInShareTheme",
     "splitEditorOrientation",
     "seenCallToActions",
+    "ckeditorEnabledPlugins",
 
     // AI/LLM integration options
     "aiEnabled",
diff --git a/apps/server/src/routes/routes.ts b/apps/server/src/routes/routes.ts
index f1aeb92097..eaf7fa7f65 100644
--- a/apps/server/src/routes/routes.ts
+++ b/apps/server/src/routes/routes.ts
@@ -59,6 +59,7 @@ import openaiRoute from "./api/openai.js";
 import anthropicRoute from "./api/anthropic.js";
 import llmRoute from "./api/llm.js";
 import systemInfoRoute from "./api/system_info.js";
+import ckeditorPluginsRoute from "./api/ckeditor_plugins.js";
 
 import etapiAuthRoutes from "../etapi/auth.js";
 import etapiAppInfoRoutes from "../etapi/app_info.js";
@@ -220,6 +221,15 @@ function register(app: express.Application) {
     apiRoute(PUT, "/api/options", optionsApiRoute.updateOptions);
     apiRoute(GET, "/api/options/user-themes", optionsApiRoute.getUserThemes);
     apiRoute(GET, "/api/options/locales", optionsApiRoute.getSupportedLocales);
+    
+    // CKEditor plugins management
+    apiRoute(GET, "/api/ckeditor-plugins/registry", ckeditorPluginsRoute.getPluginRegistry);
+    apiRoute(GET, "/api/ckeditor-plugins/config", ckeditorPluginsRoute.getUserPluginConfig);
+    apiRoute(PUT, "/api/ckeditor-plugins/config", ckeditorPluginsRoute.updateUserPluginConfig);
+    apiRoute(GET, "/api/ckeditor-plugins/query", ckeditorPluginsRoute.queryPlugins);
+    apiRoute(PST, "/api/ckeditor-plugins/validate", ckeditorPluginsRoute.validatePluginConfiguration);
+    apiRoute(PST, "/api/ckeditor-plugins/reset", ckeditorPluginsRoute.resetPluginConfigToDefaults);
+    apiRoute(GET, "/api/ckeditor-plugins/stats", ckeditorPluginsRoute.getPluginStats);
 
     apiRoute(PST, "/api/password/change", passwordApiRoute.changePassword);
     apiRoute(PST, "/api/password/reset", passwordApiRoute.resetPassword);
diff --git a/apps/server/src/services/options_init.ts b/apps/server/src/services/options_init.ts
index e2c0a7389d..6f03fd880d 100644
--- a/apps/server/src/services/options_init.ts
+++ b/apps/server/src/services/options_init.ts
@@ -5,6 +5,7 @@ import log from "./log.js";
 import dateUtils from "./date_utils.js";
 import keyboardActions from "./keyboard_actions.js";
 import { SANITIZER_DEFAULT_ALLOWED_TAGS, type KeyboardShortcutWithRequiredActionName, type OptionMap, type OptionNames } from "@triliumnext/commons";
+import { getDefaultPluginConfiguration } from "@triliumnext/ckeditor5";
 
 function initDocumentOptions() {
     optionService.createOption("documentId", randomSecureToken(16), false);
@@ -184,6 +185,9 @@ const defaultOptions: DefaultOption[] = [
     { name: "textNoteEditorMultilineToolbar", value: "false", isSynced: true },
     { name: "textNoteEmojiCompletionEnabled", value: "true", isSynced: true },
     { name: "textNoteCompletionEnabled", value: "true", isSynced: true },
+    
+    // CKEditor plugin configuration
+    { name: "ckeditorEnabledPlugins", value: getDefaultPluginConfiguration, isSynced: true },
 
     // HTML import configuration
     { name: "layoutOrientation", value: "vertical", isSynced: false },
diff --git a/packages/ckeditor5/src/index.ts b/packages/ckeditor5/src/index.ts
index 0bdc4c493e..d59c591991 100644
--- a/packages/ckeditor5/src/index.ts
+++ b/packages/ckeditor5/src/index.ts
@@ -4,7 +4,7 @@ import { COMMON_PLUGINS, CORE_PLUGINS, POPUP_EDITOR_PLUGINS } from "./plugins.js
 import { BalloonEditor, DecoupledEditor, FindAndReplaceEditing, FindCommand } from "ckeditor5";
 import "./translation_overrides.js";
 export { EditorWatchdog } from "ckeditor5";
-export { PREMIUM_PLUGINS } from "./plugins.js";
+export { PREMIUM_PLUGINS, PLUGIN_REGISTRY, getPluginMetadata, getPluginsByCategory, getConfigurablePlugins, getDefaultPluginConfiguration } from "./plugins.js";
 export type { EditorConfig, MentionFeed, MentionFeedObjectItem, ModelNode, ModelPosition, ModelElement, WatchdogConfig } from "ckeditor5";
 export type { TemplateDefinition } from "ckeditor5-premium-features";
 export { default as buildExtraCommands } from "./extra_slash_commands.js";
diff --git a/packages/ckeditor5/src/plugins.ts b/packages/ckeditor5/src/plugins.ts
index a16ad1bbb9..4cfe7b311a 100644
--- a/packages/ckeditor5/src/plugins.ts
+++ b/packages/ckeditor5/src/plugins.ts
@@ -30,6 +30,8 @@ import CodeBlockLanguageDropdown from "./plugins/code_block_language_dropdown.js
 import MoveBlockUpDownPlugin from "./plugins/move_block_updown.js";
 import ScrollOnUndoRedoPlugin from "./plugins/scroll_on_undo_redo.js"
 
+import type { PluginMetadata, PluginRegistry } from "@triliumnext/commons";
+
 /**
  * Plugins that are specific to Trilium and not part of the CKEditor 5 core, included in both text editors but not in the attribute editor.
  */
@@ -159,3 +161,613 @@ export const POPUP_EDITOR_PLUGINS: typeof Plugin[] = [
     ...COMMON_PLUGINS,
     BlockToolbar,
 ];
+
+/**
+ * Plugin metadata registry for CKEditor plugins in Trilium.
+ * This defines the configurable plugins with their metadata, dependencies, and categorization.
+ */
+export const PLUGIN_REGISTRY: PluginRegistry = {
+    plugins: {
+        // Core plugins (cannot be disabled)
+        "clipboard": {
+            id: "clipboard",
+            name: "Clipboard",
+            description: "Basic clipboard operations (copy, paste, cut)",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: true,
+            commands: ["copy", "paste", "cut"]
+        },
+        "enter": {
+            id: "enter",
+            name: "Enter Key",
+            description: "Enter key handling for line breaks and paragraphs",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: true,
+        },
+        "typing": {
+            id: "typing",
+            name: "Typing",
+            description: "Basic text input and keyboard handling",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: true,
+        },
+        "undo": {
+            id: "undo",
+            name: "Undo/Redo",
+            description: "Undo and redo functionality",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: true,
+            commands: ["undo", "redo"],
+            toolbarItems: ["undo", "redo"]
+        },
+        "paragraph": {
+            id: "paragraph",
+            name: "Paragraph",
+            description: "Basic paragraph formatting",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: true,
+            commands: ["paragraph"]
+        },
+
+        // Formatting plugins
+        "bold": {
+            id: "bold",
+            name: "Bold",
+            description: "Bold text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["bold"],
+            toolbarItems: ["bold"]
+        },
+        "italic": {
+            id: "italic",
+            name: "Italic",
+            description: "Italic text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["italic"],
+            toolbarItems: ["italic"]
+        },
+        "underline": {
+            id: "underline",
+            name: "Underline",
+            description: "Underline text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["underline"],
+            toolbarItems: ["underline"]
+        },
+        "strikethrough": {
+            id: "strikethrough",
+            name: "Strikethrough",
+            description: "Strikethrough text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["strikethrough"],
+            toolbarItems: ["strikethrough"]
+        },
+        "code": {
+            id: "code",
+            name: "Inline Code",
+            description: "Inline code formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["code"],
+            toolbarItems: ["code"]
+        },
+        "subscript": {
+            id: "subscript",
+            name: "Subscript",
+            description: "Subscript text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["subscript"],
+            toolbarItems: ["subscript"]
+        },
+        "superscript": {
+            id: "superscript",
+            name: "Superscript",
+            description: "Superscript text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["superscript"],
+            toolbarItems: ["superscript"]
+        },
+
+        // Structure plugins
+        "heading": {
+            id: "heading",
+            name: "Headings",
+            description: "Heading levels (H2-H6)",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["heading"],
+            toolbarItems: ["heading"]
+        },
+        "blockquote": {
+            id: "blockquote",
+            name: "Block Quote",
+            description: "Block quote formatting",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["blockQuote"],
+            toolbarItems: ["blockQuote"]
+        },
+        "list": {
+            id: "list",
+            name: "Lists",
+            description: "Bulleted and numbered lists",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["bulletedList", "numberedList"],
+            toolbarItems: ["bulletedList", "numberedList"]
+        },
+        "todolist": {
+            id: "todolist",
+            name: "Todo List",
+            description: "Checkable todo list items",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: ["list"],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["todoList"],
+            toolbarItems: ["todoList"]
+        },
+        "alignment": {
+            id: "alignment",
+            name: "Text Alignment",
+            description: "Text alignment (left, center, right, justify)",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["alignment"],
+            toolbarItems: ["alignment"]
+        },
+        "indent": {
+            id: "indent",
+            name: "Indentation",
+            description: "Text and block indentation",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["indent", "outdent"],
+            toolbarItems: ["indent", "outdent"]
+        },
+
+        // Media plugins
+        "image": {
+            id: "image",
+            name: "Images",
+            description: "Image insertion, resizing and styling",
+            category: "media",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["insertImage"],
+            toolbarItems: ["insertImage"]
+        },
+        "link": {
+            id: "link",
+            name: "Links",
+            description: "Hyperlinks and internal note links",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["link", "unlink"],
+            toolbarItems: ["link", "unlink"]
+        },
+
+        // Table plugins
+        "table": {
+            id: "table",
+            name: "Tables",
+            description: "Table creation and editing",
+            category: "tables",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["insertTable"],
+            toolbarItems: ["insertTable"]
+        },
+
+        // Advanced plugins
+        "codeblock": {
+            id: "codeblock",
+            name: "Code Blocks",
+            description: "Syntax-highlighted code blocks",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["codeBlock"],
+            toolbarItems: ["codeBlock"]
+        },
+        "math": {
+            id: "math",
+            name: "Math Formulas",
+            description: "Mathematical formulas using KaTeX",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["math"],
+            toolbarItems: ["math"]
+        },
+        "mermaid": {
+            id: "mermaid",
+            name: "Mermaid Diagrams",
+            description: "Diagram creation using Mermaid syntax",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["mermaid"],
+            toolbarItems: ["mermaid"]
+        },
+        "admonition": {
+            id: "admonition",
+            name: "Admonitions",
+            description: "Callout boxes and admonition blocks",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["admonition"],
+            toolbarItems: ["admonition"]
+        },
+        "footnotes": {
+            id: "footnotes",
+            name: "Footnotes",
+            description: "Footnote references and definitions",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["footnote"],
+            toolbarItems: ["footnote"]
+        },
+        "keyboard": {
+            id: "keyboard",
+            name: "Keyboard Shortcuts",
+            description: "Visual keyboard shortcut markers",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["kbd"],
+            toolbarItems: ["kbd"]
+        },
+        "horizontalline": {
+            id: "horizontalline",
+            name: "Horizontal Line",
+            description: "Horizontal rule/divider line",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["horizontalLine"],
+            toolbarItems: ["horizontalLine"]
+        },
+        "pagebreak": {
+            id: "pagebreak",
+            name: "Page Break",
+            description: "Page break for printing",
+            category: "structure",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["pageBreak"],
+            toolbarItems: ["pageBreak"]
+        },
+        "removeformat": {
+            id: "removeformat",
+            name: "Remove Formatting",
+            description: "Remove text formatting",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["removeFormat"],
+            toolbarItems: ["removeFormat"]
+        },
+        "findandreplace": {
+            id: "findandreplace",
+            name: "Find and Replace",
+            description: "Text search and replace functionality",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["findAndReplace"],
+            toolbarItems: ["findAndReplace"]
+        },
+        "font": {
+            id: "font",
+            name: "Font Styling",
+            description: "Font family, size, color, and background color",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["fontFamily", "fontSize", "fontColor", "fontBackgroundColor"],
+            toolbarItems: ["fontFamily", "fontSize", "fontColor", "fontBackgroundColor"]
+        },
+        "specialcharacters": {
+            id: "specialcharacters",
+            name: "Special Characters",
+            description: "Insert special characters and symbols",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["specialCharacters"],
+            toolbarItems: ["specialCharacters"]
+        },
+        "emoji": {
+            id: "emoji",
+            name: "Emoji Support",
+            description: "Emoji insertion and autocomplete",
+            category: "formatting",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["emoji"],
+            toolbarItems: ["emoji"]
+        },
+
+        // Premium plugins
+        "slashcommand": {
+            id: "slashcommand",
+            name: "Slash Commands",
+            description: "Quick command insertion with / key",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: true,
+            isCore: false,
+            commands: ["slashCommand"]
+        },
+        "template": {
+            id: "template",
+            name: "Templates",
+            description: "Text templates and snippets",
+            category: "advanced",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: true,
+            isCore: false,
+            commands: ["template"],
+            toolbarItems: ["template"]
+        },
+
+        // Trilium-specific plugins
+        "uploadimage": {
+            id: "uploadimage",
+            name: "Image Upload",
+            description: "Trilium-specific image upload handling",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: ["image"],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+        },
+        "cuttonote": {
+            id: "cuttonote",
+            name: "Cut to Note",
+            description: "Cut selected text to create a new note",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["cutToNote"]
+        },
+        "internallink": {
+            id: "internallink",
+            name: "Internal Links",
+            description: "Trilium-specific internal note linking",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: ["link"],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+        },
+        "insertdatetime": {
+            id: "insertdatetime",
+            name: "Insert Date/Time",
+            description: "Insert current date and time",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["insertDateTime"]
+        },
+        "includenote": {
+            id: "includenote",
+            name: "Include Note",
+            description: "Include content from other notes",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["includeNote"]
+        },
+        "uploadfile": {
+            id: "uploadfile",
+            name: "File Upload",
+            description: "Upload and attach files",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["uploadFile"]
+        },
+        "markdownimport": {
+            id: "markdownimport",
+            name: "Markdown Import",
+            description: "Import markdown content",
+            category: "trilium",
+            defaultEnabled: true,
+            dependencies: [],
+            conflicts: [],
+            requiresPremium: false,
+            isCore: false,
+            commands: ["markdownImport"]
+        }
+    },
+    version: "1.0.0",
+    lastModified: new Date().toISOString()
+};
+
+/**
+ * Get plugin metadata by ID
+ */
+export function getPluginMetadata(pluginId: string): PluginMetadata | undefined {
+    return PLUGIN_REGISTRY.plugins[pluginId];
+}
+
+/**
+ * Get all plugins in a category
+ */
+export function getPluginsByCategory(category: string): PluginMetadata[] {
+    return Object.values(PLUGIN_REGISTRY.plugins).filter(plugin => plugin.category === category);
+}
+
+/**
+ * Get core plugins (cannot be disabled)
+ */
+export function getCorePlugins(): PluginMetadata[] {
+    return Object.values(PLUGIN_REGISTRY.plugins).filter(plugin => plugin.isCore);
+}
+
+/**
+ * Get configurable plugins (can be enabled/disabled)
+ */
+export function getConfigurablePlugins(): PluginMetadata[] {
+    return Object.values(PLUGIN_REGISTRY.plugins).filter(plugin => !plugin.isCore);
+}
+
+/**
+ * Get default enabled plugins configuration as JSON string
+ */
+export function getDefaultPluginConfiguration(): string {
+    const defaultConfig: Record<string, boolean> = {};
+    Object.values(PLUGIN_REGISTRY.plugins).forEach(plugin => {
+        if (!plugin.isCore) {
+            defaultConfig[plugin.id] = plugin.defaultEnabled;
+        }
+    });
+    return JSON.stringify(defaultConfig);
+}
diff --git a/packages/ckeditor5/tsconfig.json b/packages/ckeditor5/tsconfig.json
index 443bd1e472..7d5c0c8832 100644
--- a/packages/ckeditor5/tsconfig.json
+++ b/packages/ckeditor5/tsconfig.json
@@ -4,19 +4,22 @@
   "include": [],
   "references": [
     {
-      "path": "../ckeditor5-footnotes"
+      "path": "../commons"
+    },
+    {
+      "path": "../ckeditor5-mermaid"
     },
     {
       "path": "../ckeditor5-math"
     },
     {
-      "path": "../ckeditor5-admonition"
+      "path": "../ckeditor5-keyboard-marker"
     },
     {
-      "path": "../ckeditor5-mermaid"
+      "path": "../ckeditor5-footnotes"
     },
     {
-      "path": "../ckeditor5-keyboard-marker"
+      "path": "../ckeditor5-admonition"
     },
     {
       "path": "./tsconfig.lib.json"
diff --git a/packages/ckeditor5/tsconfig.lib.json b/packages/ckeditor5/tsconfig.lib.json
index 00ee5d2e1d..0585ea1110 100644
--- a/packages/ckeditor5/tsconfig.lib.json
+++ b/packages/ckeditor5/tsconfig.lib.json
@@ -20,19 +20,22 @@
   ],
   "references": [
     {
-      "path": "../ckeditor5-footnotes"
+      "path": "../commons/tsconfig.lib.json"
+    },
+    {
+      "path": "../ckeditor5-mermaid"
     },
     {
       "path": "../ckeditor5-math"
     },
     {
-      "path": "../ckeditor5-admonition"
+      "path": "../ckeditor5-keyboard-marker"
     },
     {
-      "path": "../ckeditor5-mermaid"
+      "path": "../ckeditor5-footnotes"
     },
     {
-      "path": "../ckeditor5-keyboard-marker"
+      "path": "../ckeditor5-admonition"
     }
   ]
 }
diff --git a/packages/commons/src/index.ts b/packages/commons/src/index.ts
index 432990bc00..91275f3acd 100644
--- a/packages/commons/src/index.ts
+++ b/packages/commons/src/index.ts
@@ -1,5 +1,6 @@
 export * from "./lib/i18n.js";
 export * from "./lib/options_interface.js";
+export * from "./lib/ckeditor_plugin_interface.js";
 export * from "./lib/keyboard_actions_interface.js";
 export * from "./lib/hidden_subtree.js";
 export * from "./lib/rows.js";
diff --git a/packages/commons/src/lib/ckeditor_plugin_interface.ts b/packages/commons/src/lib/ckeditor_plugin_interface.ts
new file mode 100644
index 0000000000..d6f94d2d0d
--- /dev/null
+++ b/packages/commons/src/lib/ckeditor_plugin_interface.ts
@@ -0,0 +1,163 @@
+/**
+ * @module CKEditor Plugin Interface
+ * 
+ * This module defines the TypeScript interfaces and types for managing
+ * CKEditor plugins in Trilium Notes. It provides type-safe configuration
+ * for plugin enablement, metadata, and dependency management.
+ */
+
+/**
+ * Defines the categories of CKEditor plugins available in Trilium.
+ */
+export type PluginCategory = 
+    | "formatting"    // Text formatting (bold, italic, etc.)
+    | "structure"     // Document structure (headings, lists, etc.)
+    | "media"        // Images, files, embeds
+    | "tables"       // Table-related functionality
+    | "advanced"     // Advanced features (math, mermaid, etc.)
+    | "trilium"      // Trilium-specific plugins
+    | "external";    // Third-party plugins
+
+/**
+ * Represents the metadata for a CKEditor plugin.
+ */
+export interface PluginMetadata {
+    /** Unique identifier for the plugin */
+    id: string;
+    /** Human-readable display name */
+    name: string;
+    /** Brief description of the plugin's functionality */
+    description: string;
+    /** Category this plugin belongs to */
+    category: PluginCategory;
+    /** Whether this plugin is enabled by default for new users */
+    defaultEnabled: boolean;
+    /** Array of plugin IDs that this plugin depends on */
+    dependencies: string[];
+    /** Array of plugin IDs that conflict with this plugin */
+    conflicts: string[];
+    /** Whether this plugin requires a premium CKEditor license */
+    requiresPremium: boolean;
+    /** Whether this plugin is part of the core editor functionality (cannot be disabled) */
+    isCore: boolean;
+    /** Toolbar items/commands provided by this plugin */
+    toolbarItems?: string[];
+    /** Commands provided by this plugin */
+    commands?: string[];
+}
+
+/**
+ * Configuration for a user's CKEditor plugin preferences.
+ */
+export interface PluginConfiguration {
+    /** Plugin ID */
+    id: string;
+    /** Whether the plugin is enabled for this user */
+    enabled: boolean;
+    /** User-specific configuration for the plugin (if any) */
+    config?: Record<string, unknown>;
+}
+
+/**
+ * The complete registry of available CKEditor plugins.
+ */
+export interface PluginRegistry {
+    /** Map of plugin ID to plugin metadata */
+    plugins: Record<string, PluginMetadata>;
+    /** Version of the plugin registry (for cache invalidation) */
+    version: string;
+    /** Last modified timestamp */
+    lastModified: string;
+}
+
+/**
+ * Result of plugin dependency validation.
+ */
+export interface PluginValidationResult {
+    /** Whether the configuration is valid */
+    valid: boolean;
+    /** Array of validation errors */
+    errors: PluginValidationError[];
+    /** Array of warnings (non-blocking issues) */
+    warnings: PluginValidationWarning[];
+    /** Resolved list of plugins that should be enabled */
+    resolvedPlugins: string[];
+}
+
+/**
+ * Validation error for plugin configuration.
+ */
+export interface PluginValidationError {
+    /** Type of error */
+    type: "missing_dependency" | "circular_dependency" | "plugin_conflict" | "premium_required";
+    /** Plugin ID that caused the error */
+    pluginId: string;
+    /** Human-readable error message */
+    message: string;
+    /** Additional context about the error */
+    details?: Record<string, unknown>;
+}
+
+/**
+ * Validation warning for plugin configuration.
+ */
+export interface PluginValidationWarning {
+    /** Type of warning */
+    type: "dependency_disabled" | "unused_dependency" | "performance_impact";
+    /** Plugin ID that caused the warning */
+    pluginId: string;
+    /** Human-readable warning message */
+    message: string;
+    /** Additional context about the warning */
+    details?: Record<string, unknown>;
+}
+
+/**
+ * Request to update plugin configuration.
+ */
+export interface UpdatePluginConfigRequest {
+    /** Array of plugin configurations to update */
+    plugins: PluginConfiguration[];
+    /** Whether to validate dependencies before saving */
+    validate?: boolean;
+}
+
+/**
+ * Response from updating plugin configuration.
+ */
+export interface UpdatePluginConfigResponse {
+    /** Whether the update was successful */
+    success: boolean;
+    /** Validation result (if validation was requested) */
+    validation?: PluginValidationResult;
+    /** Updated plugin configurations */
+    plugins: PluginConfiguration[];
+    /** Any errors that occurred during the update */
+    errors?: string[];
+}
+
+/**
+ * Options for querying the plugin registry.
+ */
+export interface QueryPluginsOptions {
+    /** Filter by category */
+    category?: PluginCategory;
+    /** Filter by enabled status */
+    enabled?: boolean;
+    /** Filter by core status */
+    coreOnly?: boolean;
+    /** Include user configuration in results */
+    includeConfig?: boolean;
+}
+
+/**
+ * Result of querying plugins.
+ */
+export interface QueryPluginsResult {
+    /** Array of plugin metadata */
+    plugins: (PluginMetadata & { enabled?: boolean; config?: Record<string, unknown> })[];
+    /** Total count of plugins (before filtering) */
+    totalCount: number;
+    /** Categories available in the registry */
+    categories: PluginCategory[];
+}
\ No newline at end of file
diff --git a/packages/commons/src/lib/options_interface.ts b/packages/commons/src/lib/options_interface.ts
index ae63d02503..0147a93d39 100644
--- a/packages/commons/src/lib/options_interface.ts
+++ b/packages/commons/src/lib/options_interface.ts
@@ -150,6 +150,9 @@ export interface OptionDefinitions extends KeyboardShortcutsOptions<KeyboardActi
     codeOpenAiModel: string;
     aiSelectedProvider: string;
     seenCallToActions: string;
+    
+    // CKEditor plugin options
+    ckeditorEnabledPlugins: string;
 }
 
 export type OptionNames = keyof OptionDefinitions;