PDF Viewer corrupts font size.

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---

### Steps to reproduce
1. Edit a pdf file with embedded proprietary fonts with Nextcloud's PDF Viewer.
2. Download and edit the file again with Acrobat Web Extension or any other PDF app.

### Expected behaviour
The font size should be the same when you edit the file with another app.

### Actual behaviour
The font size is different on the edited forms using PDF Viewer:

![Image](https://github.com/user-attachments/assets/dcc127b5-eeca-4f05-a358-e708cc80df70)

### Server configuration

**Web server:** Apache

**Database:** PostgreSQL

**PHP version:** 8.3

**Nextcloud version:** 30.0.10

<details>
<summary>List of activated apps</summary>

```
Enabled:
  - activity: 3.0.0
  - admin_audit: 1.20.0
  - announcementcenter: 7.1.1
  - bruteforcesettings: 3.0.0
  - cfg_share_links: 7.0.1
  - checksum: 1.2.6
  - circles: 30.0.0
  - cloud_federation_api: 1.13.0
  - comments: 1.20.1
  - contactsinteraction: 1.11.0
  - dav: 1.31.1
  - federatedfilesharing: 1.20.0
  - federation: 1.20.0
  - files: 2.2.0
  - files_downloadactivity: 1.18.1
  - files_downloadlimit: 3.0.0
  - files_external: 1.22.0
  - files_pdfviewer: 3.0.0
  - files_reminders: 1.3.0
  - files_sharing: 1.22.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - files_zip: 2.1.0
  - firstrunwizard: 3.0.0
  - guests: 4.2.0
  - logreader: 3.0.0
  - lookup_server_connector: 1.18.0
  - memories: 7.5.2
  - metadata: 0.22.0
  - nextcloud-aio: 0.7.0
  - nextcloud_announcements: 2.0.0
  - notifications: 3.0.0
  - notify_push: 1.1.0
  - oauth2: 1.18.1
  - onlyoffice: 9.8.0
  - password_policy: 2.0.0
  - photos: 3.0.2
  - previewgenerator: 5.8.0
  - privacy: 2.0.0
  - provisioning_api: 1.20.0
  - quota_warning: 1.21.0
  - recommendations: 3.0.0
  - registration: 2.7.0
  - related_resources: 1.5.0
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - sharebymail: 1.20.0
  - skyprint: 0.1.7
  - socialsharing_email: 3.3.0
  - socialsharing_facebook: 3.3.0
  - socialsharing_telegram: 3.3.0
  - socialsharing_twitter: 3.3.0
  - support: 2.0.0
  - survey_client: 2.0.0
  - systemtags: 1.20.0
  - text: 4.1.0
  - theming: 2.6.0
  - twofactor_admin: 4.8.0
  - twofactor_backupcodes: 1.19.0
  - twofactor_nextcloud_notification: 4.0.0
  - twofactor_totp: 12.0.0-dev
  - twofactor_webauthn: 2.1.0
  - user_migration: 7.0.1
  - user_status: 1.10.0
  - viewer: 3.0.0
  - weather_status: 1.10.0
  - webhook_listeners: 1.1.0-dev
  - welcome: 1.2.1
  - workflowengine: 2.12.0
Disabled:
  - app_api: 4.0.6 (installed 4.0.0)
  - dashboard: 7.10.0 (installed 7.9.0)
  - encryption: 2.18.0
  - suspicious_login: 8.0.0
  - user_ldap: 1.21.0
```
</details>

<details>
<summary>Nextcloud configuration</summary>

```
{
    "system": {
        "one-click-instance": true,
        "one-click-instance.user-limit": 100,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "check_data_directory_permissions": false,
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "password": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "overwritehost": "REMOVED",
        "overwriteprotocol": "https",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "REMOVED"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "skeletondirectory": "\/mnt\/ncdata\/skeleton",
        "dbtype": "pgsql",
        "version": "30.0.10.1",
        "overwrite.cli.url": "REMOVED",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "loglevel": 3,
        "log_type": "file",
        "logfile": "\/var\/www\/html\/data\/nextcloud.log",
        "log_rotate_size": 10485760,
        "log.condition": {
            "apps": [
                "admin_audit"
            ]
        },
        "preview_max_x": 512,
        "preview_max_y": 512,
        "jpeg_quality": 60,
        "enabledPreviewProviders": {
            "1": "OC\\Preview\\Image",
            "2": "OC\\Preview\\MarkDown",
            "3": "OC\\Preview\\MP3",
            "4": "OC\\Preview\\TXT",
            "5": "OC\\Preview\\OpenDocument",
            "6": "OC\\Preview\\Krita",
            "7": "OC\\Preview\\Movie",
            "8": "OC\\Preview\\PDF"
        },
        "enable_previews": true,
        "upgrade.disable-web": true,
        "mail_smtpmode": "smtp",
        "trashbin_retention_obligation": "auto, 30",
        "versions_retention_obligation": "auto, 30",
        "activity_expire_days": 30,
        "simpleSignUpLink.shown": false,
        "share_folder": "\/Shared",
        "one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
        "upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
        "updatedirectory": "\/nc-updater",
        "maintenance_window_start": 100,
        "allow_local_remote_servers": true,
        "davstorage.request_timeout": 86400,
        "htaccess.RewriteBase": "\/",
        "dbpersistent": false,
        "auth.bruteforce.protection.enabled": true,
        "ratelimit.protection.enabled": true,
        "files_external_allow_create_new_local": true,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "preview_imaginary_key": "***REMOVED SENSITIVE VALUE***",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "default_phone_region": "MX",
        "default_locale": "es_MX",
        "default_language": "es_MX",
        "memories.gis_type": 2,
        "twofactor_enforced": "true",
        "twofactor_enforced_groups": [
            "admin"
        ],
        "twofactor_enforced_excluded_groups": [],
        "memories.db.triggers.fcu": true,
        "memories.exiftool": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/exiftool-amd64-musl",
        "memories.vod.path": "\/var\/www\/html\/custom_apps\/memories\/bin-ext\/go-vod-amd64",
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "memories.vod.external": true,
        "memories.vod.connect": "nextcloud-aio-memories:47788",
        "documentation_url.server_logs": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/5425",
        "onlyoffice": {
            "jwt_secret": "***REMOVED SENSITIVE VALUE***",
            "jwt_header": "AuthorizationJwt"
        },
        "forbidden_filename_basenames": [
            "con",
            "prn",
            "aux",
            "nul",
            "com0",
            "com1",
            "com2",
            "com3",
            "com4",
            "com5",
            "com6",
            "com7",
            "com8",
            "com9",
            "com\u00b9",
            "com\u00b2",
            "com\u00b3",
            "lpt0",
            "lpt1",
            "lpt2",
            "lpt3",
            "lpt4",
            "lpt5",
            "lpt6",
            "lpt7",
            "lpt8",
            "lpt9",
            "lpt\u00b9",
            "lpt\u00b2",
            "lpt\u00b3"
        ],
        "forbidden_filename_characters": [
            "<",
            ">",
            ":",
            "\"",
            "|",
            "?",
            "*",
            "\\",
            "\/"
        ],
        "forbidden_filename_extensions": [
            " ",
            ".",
            ".filepart",
            ".part"
        ],
        "data-fingerprint": "1c2ec01766ca042fe66a0304c277810b",
        "DOMAIN": "REMOVED"
    }
}
```
</details>

### Browser

**Browser name:** Brave Browser

**Browser version:** 1.78.97

**Operating system:** Ubuntu 25.04

<details>
<summary>Browser log</summary>

```
Insert your browser log here, this could for example include:
a) 
index.mjs:54 could not invoke event listener TypeError: Cannot read properties of undefined (reading '$props')
    at Ie.setPresets (TypeFilter.ts:127:30)
    at Ie.reset (TypeFilter.ts:123:14)
    at filters.ts:83:24
    at index.mjs:52:9
    at Array.forEach (<anonymous>)
    at s.emit (index.mjs:49:14)
    at o.emit (index.mjs:25:14)
    at h (index.mjs:93:12)
    at o.showView (Navigation.vue:120:13)
    at o.beforeMount (Navigation.vue:95:14)
(anonymous) @ index.mjs:54
cfg_share_links-regRenameLink.mjs?v=bbf7cfd0-7:2 CfgShareLinks: RenameLink init
cfg_share_links-regNewLink.mjs?v=bbf7cfd0-7:3 CfgShareLinks: NewLink init
session-heartbeat.js:83 session heartbeat polling started
cfg_share_links-regRenameLink.mjs?v=bbf7cfd0-7:2 CfgShareLinks: Registering rename action
/apps/notifications/js/style-CmLvDuwV.chunk.mjs:1 
            
            
           Failed to load resource: the server responded with a status of 404 ()
/apps/activity/js/index.chunk.mjs:1 
            
            
           Failed to load resource: the server responded with a status of 404 ()
sidebar.js:55 Uncaught (in promise) TypeError: Failed to fetch dynamically imported module: https://(REMOVED)/apps/activity/js/ActivityTab-DKdzW-XP.chunk.mjs
content-script.js:104 Failed to get subsystem status for purpose Object
/apps/files_pdfviewer/js/pdfjs/web/locale/locale.json?v=3.0.0:1 
            
            
           Failed to load resource: the server responded with a status of 404 ()
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
app.js:1502 PDF 414e9e1afbd7cfe209b61abf3e37795c [1.4 Acrobat Distiller 15.0 (Windows); modified using iTextSharp™ 5.5.3 ©2000-2014 iText Group NV (AGPL-version) / -] (PDF.js: 4.0.189 [50f52b43a])
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
files_pdfviewer/:1 Uncaught (in promise) SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
```

</details>

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PDF Viewer corrupts font size. #1208

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PDF Viewer corrupts font size. #1208

Description

How to use GitHub

Steps to reproduce

Expected behaviour

Actual behaviour

Server configuration

Browser

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions