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locally hosted web application that allows you to perform various operations on PDF files
b6e675fab3
# Description of Changes
* Transparency Fix: Implemented a pre-processing step that adds an
opaque white background to pages before conversion. This ensures that
transparent elements are correctly
flattened against white rather than defaulting to black (a common issue
in Ghostscript flattening).
* Color Distortion Fix: Removed a misconfigured -sDefaultCMYKProfile
setting in the Ghostscript command that was incorrectly pointing to an
RGB profile. This resolves the
"dark/black" color corruption previously seen in print-ready CMYK PDFs.
* PDF/A Compliance Improvements:
* Font Handling: Updated fixType1FontCharSet to only add a standard
CharSet if it is missing or empty. This prevents validation errors where
subsetted fonts were being forced
to declare glyphs they did not contain.
* Spot Color Unification: Added fixSeparationColorSpaces to detect and
unify TintTransform objects for Separation colors with the same colorant
name, ensuring consistency
across document resources.
* OCG Naming: Ensured all Optional Content Groups have a valid Name
entry.
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Please provide a summary of the changes, including:
- What was changed
- Why the change was made
- Any challenges encountered
Closes #(issue_number)
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---
## Checklist
### General
- [X] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [X] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [X] I have performed a self-review of my own code
- [X] My changes generate no new warnings
### Documentation
- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)
### Translations (if applicable)
- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)
### UI Changes (if applicable)
- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)
### Testing (if applicable)
- [X] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.
---------
Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>
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| .github | ||
| .vscode | ||
| app | ||
| devGuide | ||
| devTools | ||
| docker | ||
| docs | ||
| frontend | ||
| gradle/wrapper | ||
| images | ||
| scripts | ||
| testing | ||
| .dockerignore | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .pre-commit-config.yaml | ||
| ADDING_TOOLS.md | ||
| build.gradle | ||
| CLAUDE.md | ||
| CONTRIBUTING.md | ||
| DATABASE.md | ||
| DeveloperGuide.md | ||
| gradle.properties | ||
| gradlew | ||
| gradlew.bat | ||
| HowToUseOCR.md | ||
| launch4jConfig.xml | ||
| LICENSE | ||
| README.md | ||
| SECURITY.md | ||
| settings.gradle | ||
| test_globalsign.pdf | ||
| test_irs_signed.pdf | ||
| WINDOWS_SIGNING.md | ||
Stirling PDF - The Open-Source PDF Platform
Stirling PDF is a powerful, open-source PDF editing platform. Run it as a personal desktop app, in the browser, or deploy it on your own servers with a private API. Edit, sign, redact, convert, and automate PDFs without sending documents to external services.
Key Capabilities
- Everywhere you work - Desktop client, browser UI, and self-hosted server with a private API.
- 50+ PDF tools - Edit, merge, split, sign, redact, convert, OCR, compress, and more.
- Automation & workflows - No-code pipelines direct in UI with APIs to process millions of PDFs.
- Enterprise‑grade - SSO, auditing, and flexible on‑prem deployments.
- Developer platform - REST APIs available for nearly all tools to integrate into your existing systems.
- Global UI - Interface available in 40+ languages.
For a full feature list, see the docs: https://docs.stirlingpdf.com
Quick Start
docker run -p 8080:8080 docker.stirlingpdf.com/stirlingtools/stirling-pdf
Then open: http://localhost:8080
For full installation options (including desktop and Kubernetes), see our Documentation Guide.
Resources
Support
- Community Discord
- Bug Reports: Github issues
Contributing
We welcome contributions! Please see CONTRIBUTING.md for guidelines.
For development setup, see the Developer Guide.
For adding translations, see the Translation Guide.
License
Stirling PDF is open-core. See LICENSE for details.