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This is a robust, locally hosted web-based PDF manipulation tool using Docker. It enables you to carry out various operations on PDF files, including splitting, merging, converting, reorganizing, adding images, rotating, compressing, and more. This locally hosted web application has evolved to encompass a comprehensive set of features, addressing all your PDF requirements.

Stirling PDF does not initiate any outbound calls for record-keeping or tracking purposes.

All files and PDFs exist either exclusively on the client side, reside in server memory only during task execution, or temporarily reside in a file solely for the execution of the task. Any file downloaded by the user will have been deleted from the server by that point.



  • Dark mode support.
  • Custom download options (see here for example)
  • Parallel file processing and downloads
  • API for integration with external scripts
  • Optional Login and Authentication support (see here for documentation)

PDF Features

Page Operations

  • View and modify PDFs - View multi page PDFs with custom viewing sorting and searching. Plus on page edit features like annotate, draw and adding text and images. (Using PDF.js with Joxit and Liberation.Liberation fonts)
  • Full interactive GUI for merging/splitting/rotating/moving PDFs and their pages.
  • Merge multiple PDFs together into a single resultant file.
  • Split PDFs into multiple files at specified page numbers or extract all pages as individual files.
  • Reorganize PDF pages into different orders.
  • Rotate PDFs in 90-degree increments.
  • Remove pages.
  • Multi-page layout (Format PDFs into a multi-paged page).
  • Scale page contents size by set %.
  • Adjust Contrast.
  • Crop PDF.
  • Auto Split PDF (With physically scanned page dividers).
  • Extract page(s).
  • Convert PDF to a single page.

Conversion Operations

  • Convert PDFs to and from images.
  • Convert any common file to PDF (using LibreOffice).
  • Convert PDF to Word/Powerpoint/Others (using LibreOffice).
  • Convert HTML to PDF.
  • URL to PDF.
  • Markdown to PDF.

Security & Permissions

  • Add and remove passwords.
  • Change/set PDF Permissions.
  • Add watermark(s).
  • Certify/sign PDFs.
  • Sanitize PDFs.
  • Auto-redact text.

Other Operations

  • Add/Generate/Write signatures.
  • Repair PDFs.
  • Detect and remove blank pages.
  • Compare 2 PDFs and show differences in text.
  • Add images to PDFs.
  • Compress PDFs to decrease their filesize (Using OCRMyPDF).
  • Extract images from PDF.
  • Extract images from Scans.
  • Add page numbers.
  • Auto rename file by detecting PDF header text.
  • OCR on PDF (Using OCRMyPDF).
  • PDF/A conversion (Using OCRMyPDF).
  • Edit metadata.
  • Flatten PDFs.
  • Get all information on a PDF to view or export as JSON.

For a overview of the tasks and the technology each uses please view Demo of the app is available here. username: demo, password: demo

Technologies used

How to use


Please view

Docker / Podman

Stirling PDF has 2 different versions, a Full version and ultra-Lite version. Depending on the types of features you use you may want a smaller image to save on space. To see what the different versions offer please look at our version mapping For people that don't mind about space optimization just use the latest tag. Docker Image Size (tag) Docker Image Size (tag)

Docker Run

docker run -d \
  -p 8080:8080 \
  -v /location/of/trainingData:/usr/share/tessdata \
  -v /location/of/extraConfigs:/configs \
  -v /location/of/logs:/logs \
  -e LANGS=en_GB \
  --name stirling-pdf \

  Can also add these for customisation but are not required

  -v /location/of/customFiles:/customFiles \

Docker Compose

version: '3.3'
    image: frooodle/s-pdf:latest
      - '8080:8080'
      - /location/of/trainingData:/usr/share/tessdata #Required for extra OCR languages
      - /location/of/extraConfigs:/configs
#      - /location/of/customFiles:/customFiles/
#      - /location/of/logs:/logs/
      - LANGS=en_GB

Note: Podman is CLI-compatible with Docker, so simply replace "docker" with "podman".

Enable OCR/Compression feature

Please view

Supported Languages

Stirling PDF currently supports 32!

Language Progress
English (English) (en_GB) 100%
English (US) (en_US) 100%
Arabic (العربية) (ar_AR) 40%
German (Deutsch) (de_DE) 99%
French (Français) (fr_FR) 94%
Spanish (Español) (es_ES) 94%
Simplified Chinese (简体中文) (zh_CN) 95%
Traditional Chinese (繁體中文) (zh_TW) 94%
Catalan (Català) (ca_CA) 49%
Italian (Italiano) (it_IT) 99%
Swedish (Svenska) (sv_SE) 40%
Polish (Polski) (pl_PL) 42%
Romanian (Română) (ro_RO) 39%
Korean (한국어) (ko_KR) 87%
Portuguese Brazilian (Português) (pt_BR) 61%
Russian (Русский) (ru_RU) 86%
Basque (Euskara) (eu_ES) 63%
Japanese (日本語) (ja_JP) 87%
Dutch (Nederlands) (nl_NL) 84%
Greek (Ελληνικά) (el_GR) 85%
Turkish (Türkçe) (tr_TR) 97%
Indonesia (Bahasa Indonesia) (id_ID) 78%
Hindi (हिंदी) (hi_IN) 79%
Hungarian (Magyar) (hu_HU) 77%
Bulgarian (Български) (bg_BG) 97%
Sebian Latin alphabet (Srpski) (sr_LATN_RS) 80%
Ukrainian (Українська) (uk_UA) 86%
Slovakian (Slovensky) (sk_SK) 94%
Czech (Česky) (cs_CZ) 93%
Croatian (Hrvatski) (hr_HR) 98%
Norwegian (Norsk) (no_NB) 98%

Contributing (creating issues, translations, fixing bugs, etc.)

Please see our Contributing Guide!


Stirling PDF allows easy customization of the app. Includes things like

  • Custom application name
  • Custom slogans, icons, HTML, images CSS etc (via file overrides)

There are two options for this, either using the generated settings file settings.yml This file is located in the /configs directory and follows standard YAML formatting

Environment variables are also supported and would override the settings file For example in the settings.yml you have

  enableLogin: 'true'

To have this via an environment variable you would have SYSTEM_ENABLELOGIN

The Current list of settings is

  enableLogin: false # set to 'true' to enable login
  csrfDisabled: true # Set to 'true' to disable CSRF protection (not recommended for production)
  loginAttemptCount: 5 # lock user account after 5 tries
  loginResetTimeMinutes: 120 # lock account for 2 hours after x attempts
#  initialLogin:
#    username: "admin" # Initial username for the first login
#    password: "stirling" # Initial password for the first login
#  oauth2:
#    enabled: false # set to 'true' to enable login (Note: enableLogin must also be 'true' for this to work)
#    issuer: "" # set to any provider that supports OpenID Connect Discovery (/.well-known/openid-configuration) end-point
#    clientId: "" # Client ID from your provider
#    clientSecret: "" # Client Secret from your provider
#    autoCreateUser: false # set to 'true' to allow auto-creation of non-existing users
#    useAsUsername: "email" # Default is 'email'; custom fields can be used as the username
#    scopes: "openid, profile, email" # Specify the scopes for which the application will request permissions
#    provider: "google" # Set this to your OAuth provider's name, e.g., 'google' or 'keycloak'
#    client:
#      google:
#        clientId: "" # Client ID for Google OAuth2
#        clientSecret: "" # Client Secret for Google OAuth2
#        scopes: "," # Scopes for Google OAuth2
#        useAsUsername: "email" # Field to use as the username for Google OAuth2
#      github:
#        clientId: "" # Client ID for GitHub OAuth2
#        clientSecret: "" # Client Secret for GitHub OAuth2
#        scopes: "read:user" # Scope for GitHub OAuth2
#        useAsUsername: "login" # Field to use as the username for GitHub OAuth2
#      keycloak:
#        issuer: "" # URL of the Keycloak realm's OpenID Connect Discovery endpoint
#        clientId: "stirling-pdf" # Client ID for Keycloak OAuth2
#        clientSecret: "" # Client Secret for Keycloak OAuth2
#        scopes: "openid, profile, email" # Scopes for Keycloak OAuth2
#        useAsUsername: "email" # Field to use as the username for Keycloak OAuth2

  defaultLocale: 'en-US' # Set the default language (e.g. 'de-DE', 'fr-FR', etc)
  googlevisibility: false # 'true' to allow Google visibility (via robots.txt), 'false' to disallow
  enableAlphaFunctionality: false # Set to enable functionality which might need more testing before it fully goes live (This feature might make no changes)
  showUpdate: true # see when a new update is available
  showUpdateOnlyAdmin: false # Only admins can see when a new update is available, depending on showUpdate it must be set to 'true'
  customHTMLFiles: false # enable to have files placed in /customFiles/templates override the existing template html files

  appName: null # Application's visible name
  homeDescription: null # Short description or tagline shown on homepage.
  appNameNavbar: null # Name displayed on the navigation bar

  toRemove: [] # List endpoints to disable (e.g. ['img-to-pdf', 'remove-pages'])
  groupsToRemove: [] # List groups to disable (e.g. ['LibreOffice'])

  enabled: true # 'true' to enable Info APIs (`/api/*`) endpoints, 'false' to disable

There is an additional config file /configs/custom_settings.yml were users familiar with java and spring can input their own settings on-top of Stirling-PDFs existing ones

Extra notes

  • Endpoints. Currently, the endpoints ENDPOINTS_TO_REMOVE and GROUPS_TO_REMOVE can include comma separate lists of endpoints and groups to disable as example ENDPOINTS_TO_REMOVE=img-to-pdf,remove-pages would disable both image-to-pdf and remove pages, GROUPS_TO_REMOVE=LibreOffice Would disable all things that use LibreOffice. You can see a list of all endpoints and groups here
  • customStaticFilePath. Customise static files such as the app logo by placing files in the /customFiles/static/ directory. An example of customising app logo is placing a /customFiles/static/favicon.svg to override current SVG. This can be used to change any images/icons/css/fonts/js etc in Stirling-PDF

Environment only parameters

  • SYSTEM_ROOTURIPATH ie set to /pdf-app to Set the application's root URI to localhost:8080/pdf-app
  • SYSTEM_CONNECTIONTIMEOUTMINUTES to set custom connection timeout values
  • DOCKER_ENABLE_SECURITY to tell docker to download security jar (required as true for auth login)
  • INSTALL_BOOK_AND_ADVANCED_HTML_OPS to download calibre onto stirling-pdf enabling pdf to/from book and advanced html conversion
  • LANGS to define custom font libraries to install for use for document conversions


For those wanting to use Stirling-PDFs backend API to link with their own custom scripting to edit PDFs you can view all existing API documentation here or navigate to /swagger-ui/index.html of your stirling-pdf instance for your versions documentation (Or by following the API button in your settings of Stirling-PDF)

Login authentication



  • User must have the folder ./configs volumed within docker so that it is retained during updates.
  • Docker users must download the security jar version by setting DOCKER_ENABLE_SECURITY to true in environment variables.
  • Then either enable login via the settings.yml file or via setting SECURITY_ENABLE_LOGIN to true
  • Now the initial user will be generated with username admin and password stirling. On login you will be forced to change the password to a new one. You can also use the environment variables SECURITY_INITIALLOGIN_USERNAME and SECURITY_INITIALLOGIN_PASSWORD to set your own straight away (Recommended to remove them after user creation).

Once the above has been done, on restart, a new will show if everything worked.

When you login to Stirling PDF you will be redirected to /login page to login with those default credentials. After login everything should function as normal

To access your account settings go to Account settings in the settings cog menu (top right in navbar) This Account settings menu is also where you find your API key.

To add new users go to the bottom of Account settings and hit 'Admin Settings', here you can add new users. The different roles mentioned within this are for rate limiting. This is a Work in progress which will be expanding on more in future

For API usage you must provide a header with 'X-API-Key' and the associated API key for that user.


Q1: What are your planned features?

  • Progress bar/Tracking
  • Full custom logic pipelines to combine multiple operations together.
  • Folder support with auto scanning to perform operations on
  • Redact text (Via UI not just automated way)
  • Add Forms
  • Multi page layout (Stich PDF pages together) support x rows y columns and custom page sizing
  • Fill forms manually or automatically

Q2: Why is my application downloading .htm files?

This is an issue caused commonly by your NGINX configuration. The default file upload size for NGINX is 1MB, you need to add the following in your Nginx sites-available file. client_max_body_size SIZE; Where "SIZE" is 50M for example for 50MB files.

Q3: Why is my download timing out

NGINX has timeout values by default so if you are running Stirling-PDF behind NGINX you may need to set a timeout value such as adding the config proxy_read_timeout 3600;