encryption4all · rubenhensen · Apr 23, 2026 · Apr 21, 2026 · Apr 23, 2026 · Apr 23, 2026
diff --git a/src/lib/components/SEO.svelte b/src/lib/components/SEO.svelte
@@ -1,18 +1,52 @@
 <script>
-    let { title = '', description = '', ogImage = '', ogType = 'website', canonical = '' } = $props()
+    import { page } from '$app/state'
+
+    let {
+        title = '',
+        description = '',
+        ogImage = '',
+        ogType = 'website',
+        canonical = '',
+        jsonLd = null,
+    } = $props()
+
     const siteName = 'PostGuard'
-    const defaultDescription = 'PostGuard offers free and easy-to-use end-to-end encryption for emails and files.'
+    const siteUrl = 'https://postguard.eu'
+    const defaultDescription =
+        'PostGuard offers free and easy-to-use end-to-end encryption for emails and files.'
     const defaultImage = '/pg_logo.png'
+
+    const canonicalUrl = $derived(
+        canonical || (page?.url?.pathname ? `${siteUrl}${page.url.pathname}` : '')
+    )
+    const ogImageUrl = $derived(
+        (ogImage || defaultImage).startsWith('http')
+            ? ogImage || defaultImage
+            : `${siteUrl}${ogImage || defaultImage}`
+    )
+    const jsonLdString = $derived(jsonLd ? JSON.stringify(jsonLd) : '')
 </script>
 
 <svelte:head>
     <title>{title ? `${title} | ${siteName}` : siteName}</title>
     <meta name="description" content={description || defaultDescription} />
     <meta property="og:title" content={title || siteName} />
     <meta property="og:description" content={description || defaultDescription} />
-    <meta property="og:image" content={ogImage || defaultImage} />
+    <meta property="og:image" content={ogImageUrl} />
     <meta property="og:type" content={ogType} />
     <meta property="og:site_name" content={siteName} />
-    {#if canonical}<link rel="canonical" href={canonical} />{/if}
+    {#if canonicalUrl}
+        <meta property="og:url" content={canonicalUrl} />
+        <link rel="canonical" href={canonicalUrl} />
+        <link rel="alternate" hreflang="en" href={canonicalUrl} />
+        <link rel="alternate" hreflang="nl" href={canonicalUrl} />
+        <link rel="alternate" hreflang="x-default" href={canonicalUrl} />
+    {/if}
     <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:title" content={title || siteName} />
+    <meta name="twitter:description" content={description || defaultDescription} />
+    <meta name="twitter:image" content={ogImageUrl} />
+    {#if jsonLdString}
+        {@html `<script type="application/ld+json">${jsonLdString}<\/script>`}
+    {/if}
 </svelte:head>
diff --git a/src/lib/locales/en.json b/src/lib/locales/en.json
@@ -167,13 +167,13 @@
                 "tagline": "Securely send your files",
                 "upperTextDropZone": "Drag & drop files <br/> or",
                 "lowerTextDropZone": "click to upload",
-                "sizeLimitText": "max. 2GB",
+                "sizeLimitText": "max. 5 GB per 14 days",
                 "dragText": "Drag files here",
                 "dropText": "Drop to add files",
                 "dropMoreText": "Drop to add more files",
                 "orText": "or",
                 "chooseFilesButton": "Choose files",
-                "maxSizeText": "Maximum 2 GB",
+                "maxSizeText": "5 GB per 14 days",
                 "addMoreFiles": "Add more files",
                 "fileSummary": "{count} {count, plural, one {file} other {files}} added, {size} GB remaining"
             },
@@ -223,7 +223,7 @@
                 "title": "Fill in all required fields",
                 "continueButton": "Continue filling in",
                 "noFiles": "You haven't added any files yet",
-                "filesTooLarge": "The files exceed the maximum size of {max} GB",
+                "filesTooLarge": "The files exceed the {max} GB limit (14-day window)",
                 "noEmail": "You haven't filled in an email address for a recipient",
                 "invalidEmail": "The email address {email} is not valid",
                 "missingAttribute": "{attribute} of {email} is missing",

diff --git a/src/lib/locales/nl.json b/src/lib/locales/nl.json
@@ -166,13 +166,13 @@
             "fileBox": {
                 "tagline": "Verstuur je bestanden veilig",
                 "upperTextDropZone": "Sleep bestanden hierheen <br/> of",
-                "lowerTextDropZone": "klik om te uploaden <br/> (max. 2GB)",
+                "lowerTextDropZone": "klik om te uploaden <br/> (max. 5 GB per 14 dagen)",
                 "dragText": "Sleep bestanden hierheen",
                 "dropText": "Loslaten om bestanden toe te voegen",
                 "dropMoreText": "Loslaten om meer bestanden toe te voegen",
                 "orText": "of",
                 "chooseFilesButton": "Kies bestanden",
-                "maxSizeText": "Maximaal 2 GB",
+                "maxSizeText": "5 GB per 14 dagen",
                 "addMoreFiles": "Voeg meer bestanden toe",
                 "fileSummary": "{count} {count, plural, one {bestand} other {bestanden}} toegevoegd, nog {size} GB over"
             },
@@ -222,7 +222,7 @@
                 "title": "Vul alle verplichte velden in",
                 "continueButton": "Verder met invullen",
                 "noFiles": "Je hebt nog geen bestanden toegevoegd",
-                "filesTooLarge": "De bestanden overschrijden de maximale grootte van {max} GB",
+                "filesTooLarge": "De bestanden overschrijden de {max} GB limiet (14 dagen)",
                 "noEmail": "Je hebt nog geen e-mailadres voor een ontvanger ingevuld",
                 "invalidEmail": "Het e-mailadres {email} is niet geldig",
                 "missingAttribute": "{attribute} van {email} ontbreekt",

diff --git a/src/routes/(marketing)/+layout.js b/src/routes/(marketing)/+layout.js
@@ -3,6 +3,7 @@ import { locale, waitLocale } from 'svelte-i18n'
 import { browser } from '$app/environment'
 
 export const prerender = true
+export const trailingSlash = 'always'
 
 if (browser) {
     const stored = localStorage.getItem('preferredLanguage')

diff --git a/src/routes/(marketing)/+page.svelte b/src/routes/(marketing)/+page.svelte
@@ -13,11 +13,52 @@
             contactEl.href = `mailto:${addr}`
         }
     })
+
+    const homepageJsonLd = {
+        '@context': 'https://schema.org',
+        '@graph': [
+            {
+                '@type': 'SoftwareApplication',
+                name: 'PostGuard',
+                description:
+                    'Free, open-source identity-based encryption for emails and files using Yivi identity attributes.',
+                applicationCategory: 'SecurityApplication',
+                operatingSystem: 'Web Browser',
+                offers: {
+                    '@type': 'Offer',
+                    price: '0',
+                    priceCurrency: 'EUR',
+                },
+                url: 'https://postguard.eu',
+                license: 'https://opensource.org/licenses/MIT',
+                softwareRequirements: 'Yivi (IRMA) app',
+                sameAs: ['https://github.com/encryption4all'],
+                author: {
+                    '@type': 'Organization',
+                    name: 'Radboud University',
+                    url: 'https://www.ru.nl',
+                },
+            },
+            {
+                '@type': 'Organization',
+                name: 'PostGuard',
+                url: 'https://postguard.eu',
+                logo: 'https://postguard.eu/pg_logo.png',
+                sameAs: ['https://github.com/encryption4all'],
+                parentOrganization: {
+                    '@type': 'Organization',
+                    name: 'Yivi',
+                    url: 'https://yivi.app',
+                },
+            },
+        ],
+    }
 </script>
 
 <SEO
     title="Secure File Sharing & Email Encryption"
     description="PostGuard offers free, easy-to-use end-to-end encryption for emails and files. Your data never leaves your browser unencrypted."
+    jsonLd={homepageJsonLd}
 />
 
 <section class="hero">

diff --git a/src/routes/(app)/addons/+page.svelte → src/routes/(marketing)/addons/+page.svelte b/src/routes/(app)/addons/+page.svelte → src/routes/(marketing)/addons/+page.svelte
@@ -1,6 +1,7 @@
 <script>
     import { _ } from 'svelte-i18n'
     import Tabs from '$lib/components/Tabs.svelte'
+    import SEO from '$lib/components/SEO.svelte'
     // import { fade } from 'svelte/transition'
     import { Tween } from 'svelte/motion'
     import { cubicOut } from 'svelte/easing'
@@ -31,6 +32,11 @@
 
 </script>
 
+<SEO
+    title="PostGuard Addons"
+    description="Install PostGuard for Thunderbird or Outlook to send and receive end-to-end encrypted emails directly from your mail client."
+/>
+
 <div class="page-wrapper">
     <div class="grid-container" bind:clientWidth={containerWidth}>
         <div class="grid-item header">

diff --git a/src/routes/(marketing)/blog/[slug]/+page.svelte b/src/routes/(marketing)/blog/[slug]/+page.svelte
@@ -1,14 +1,48 @@
 <script lang="ts">
     import SEO from '$lib/components/SEO.svelte'
+    import { page } from '$app/state'
 
     let { data } = $props()
+
+    const siteUrl = 'https://postguard.eu'
+    const articleJsonLd = $derived({
+        '@context': 'https://schema.org',
+        '@type': 'Article',
+        headline: data.metadata.title,
+        description: data.metadata.description,
+        datePublished: data.metadata.date,
+        ...(data.metadata.image
+            ? {
+                  image: data.metadata.image.startsWith('http')
+                      ? data.metadata.image
+                      : `${siteUrl}${data.metadata.image}`,
+              }
+            : {}),
+        author: {
+            '@type': data.metadata.author === 'PostGuard Team' ? 'Organization' : 'Person',
+            name: data.metadata.author || 'PostGuard Team',
+        },
+        publisher: {
+            '@type': 'Organization',
+            name: 'PostGuard',
+            logo: {
+                '@type': 'ImageObject',
+                url: `${siteUrl}/pg_logo.png`,
+            },
+        },
+        mainEntityOfPage: {
+            '@type': 'WebPage',
+            '@id': `${siteUrl}${page.url.pathname}`,
+        },
+    })
 </script>
 
 <SEO
     title={data.metadata.title}
     description={data.metadata.description}
     ogType="article"
     ogImage={data.metadata.image || ''}
+    jsonLd={articleJsonLd}
 />
 
 <article class="blog-post">

diff --git a/src/routes/sitemap.xml/+server.js b/src/routes/sitemap.xml/+server.js
@@ -1,18 +1,74 @@
 export const prerender = true
 
 export function GET() {
-    const staticPages = ['', '/about', '/privacy', '/blog']
+    /**
+     * Static pages with their last-modified dates. Bump these when the page
+     * content changes meaningfully. Values are ISO-8601 date strings (YYYY-MM-DD).
+     * @type {{ path: string, lastmod: string, changefreq: string, priority: string }[]}
+     */
+    const staticPages = [
+        {
+            path: '',
+            lastmod: '2026-04-21',
+            changefreq: 'monthly',
+            priority: '1.0',
+        },
+        {
+            path: '/about',
+            lastmod: '2026-04-21',
+            changefreq: 'monthly',
+            priority: '0.8',
+        },
+        {
+            path: '/addons',
+            lastmod: '2026-04-21',
+            changefreq: 'monthly',
+            priority: '0.8',
+        },
+        {
+            path: '/privacy',
+            lastmod: '2026-04-21',
+            changefreq: 'yearly',
+            priority: '0.5',
+        },
+        {
+            path: '/blog',
+            lastmod: '2026-04-21',
+            changefreq: 'weekly',
+            priority: '0.7',
+        },
+    ]
 
-    const postFiles = import.meta.glob('/src/content/blog/*.svx', { eager: true })
-    const blogSlugs = Object.keys(postFiles).map(
-        (path) => `/blog/${/** @type {string} */ (path.split('/').pop()).replace('.svx', '')}`
+    /** @type {Record<string, { metadata?: { date?: string } }>} */
+    const postFiles = /** @type {any} */ (
+        import.meta.glob('/src/content/blog/*.svx', { eager: true })
     )
+    const blogEntries = Object.entries(postFiles).map(([path, mod]) => {
+        const slug = /** @type {string} */ (path.split('/').pop()).replace(
+            '.svx',
+            ''
+        )
+        const date = mod?.metadata?.date ?? '2026-04-21'
+        return {
+            path: `/blog/${slug}`,
+            lastmod: String(date).slice(0, 10),
+            changefreq: 'yearly',
+            priority: '0.6',
+        }
+    })
+
+    const entries = [...staticPages, ...blogEntries]
 
-    const pages = [...staticPages, ...blogSlugs]
+    const urls = entries
+        .map(
+            (e) =>
+                `  <url>\n    <loc>https://postguard.eu${e.path}/</loc>\n    <lastmod>${e.lastmod}</lastmod>\n    <changefreq>${e.changefreq}</changefreq>\n    <priority>${e.priority}</priority>\n  </url>`
+        )
+        .join('\n')
 
     const xml = `<?xml version="1.0" encoding="UTF-8"?>
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-${pages.map((p) => `  <url><loc>https://postguard.eu${p}</loc></url>`).join('\n')}
+${urls}
 </urlset>`
 
     return new Response(xml, {

diff --git a/static/.well-known/security.txt b/static/.well-known/security.txt
@@ -0,0 +1,5 @@
+Contact: mailto:info@postguard.eu
+Expires: 2027-04-21T00:00:00.000Z
+Preferred-Languages: en, nl
+Canonical: https://postguard.eu/.well-known/security.txt
+Policy: https://github.com/encryption4all/postguard-website/security/policy
diff --git a/static/llms.txt b/static/llms.txt
@@ -0,0 +1,30 @@
+# PostGuard
+
+> PostGuard is an open-source, identity-based encrypted file sharing and email encryption service developed at Radboud University and funded by NWO. No key exchange is required — recipients are identified by Yivi (IRMA) attributes such as email address, making end-to-end encryption as simple as knowing someone's email address.
+
+PostGuard uses Identity-Based Encryption (IBE) so senders can encrypt messages using only a recipient's attributes (e.g. email). The recipient authenticates with their Yivi (IRMA) wallet to retrieve the decryption key. PostGuard runs entirely in the browser — plaintext never leaves the user's device unencrypted.
+
+## Key Pages
+- [Homepage](https://postguard.eu/): Overview of PostGuard, its core features, and the product family.
+- [About](https://postguard.eu/about/): How PostGuard works, the Radboud University team, and funding from NWO.
+- [File Sharing](https://postguard.eu/fileshare/): Web app for sending end-to-end encrypted files to any email address.
+- [Decrypt](https://postguard.eu/decrypt/): Web app for decrypting PostGuard-encrypted messages and files.
+- [Addons](https://postguard.eu/addons/): Browser and mail-client addons (Thunderbird, Outlook) for encrypted email.
+- [Privacy Policy](https://postguard.eu/privacy/): How PostGuard handles user data and attributes.
+- [Blog](https://postguard.eu/blog/): Posts about PostGuard, identity-based encryption, and secure communication.
+
+## Blog Posts
+- [Introducing PostGuard](https://postguard.eu/blog/introducing-postguard/): Overview of PostGuard's IBE approach and why it matters.
+- [Looking ahead with PostGuard](https://postguard.eu/blog/looking-ahead-with-postguard/): Roadmap and future plans.
+
+## Developer Resources
+- [Developer Documentation](https://docs.postguard.eu/): Architecture, protocols, and integration guides.
+- [GitHub Organization](https://github.com/encryption4all): Source code for PostGuard and its ecosystem libraries.
+
+## Key Facts
+- Free and open source (MIT license).
+- Built by the Digital Security group at Radboud University, Nijmegen, Netherlands.
+- Funded by the Dutch Research Council (NWO).
+- Uses Yivi (formerly IRMA) for identity verification.
+- All encryption happens client-side in the browser — no plaintext is sent to any server.
+- Usage limit is 5 GB per 14 days.
diff --git a/svelte.config.js b/svelte.config.js
@@ -14,7 +14,7 @@ const config = {
     kit: {
         adapter: adapter({ fallback: '200.html', precompress: false }),
         prerender: {
-            entries: ['/', '/about', '/privacy', '/blog', '/sitemap.xml']
+            entries: ['/', '/about', '/addons', '/privacy', '/blog', '/sitemap.xml']
         }
     },
 }