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# Description of Changes This pull request improves the PDF stamping feature, particularly the text stamping functionality, by introducing dynamic variables, improving formatting flexibility, and refining positioning logic. The changes include backend support for dynamic stamp variables (such as date, time, filename, and metadata), improvements to text layout and positioning, updates to the API and frontend for usability, and localization enhancements for user guidance. **Dynamic Stamp Variables and Text Processing:** * Added support for dynamic variables in stamp text (e.g., `@date`, `@time`, `@page_number`, `@filename`, `@uuid`, and metadata fields), including custom date formats and escaping for literal `@` symbols. This is handled by the new `processStampText` method in `StampController.java`. * Implemented validation and formatting for custom date variables, ensuring only safe formats are accepted and providing user-friendly error messages for invalid formats. **Text Layout and Positioning Improvements:** * Refactored text and image stamp positioning: now calculates line heights, block heights, and widths for multi-line stamps, and adjusts placement logic for more accurate alignment (top, center, bottom) and margins. * Updated the default font size for stamps to 40pt and improved font size handling in both backend and frontend, including validation for positive values **API and Method Signature Updates:** * Extended method signatures to include additional context (such as page index and filename) for more powerful variable substitution in stamps **Frontend and Localization Enhancements:** * Added comprehensive help text, variable descriptions, and template examples to the UI, making it easier for users to understand and use dynamic stamp variables. * Improved accessibility and clarity in the stamp formatting UI by disabling controls appropriately and providing clearer descriptions. <!-- Please provide a summary of the changes, including: - What was changed - Why the change was made - Any challenges encountered Closes #(issue_number) --> --- ## Checklist ### General - [ ] I have read the [Contribution Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md) - [ ] 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) - [ ] I have performed a self-review of my own code - [ ] 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) - [ ] 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> Co-authored-by: ConnorYoh <40631091+ConnorYoh@users.noreply.github.com> Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
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.