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locally hosted web application that allows you to perform various operations on PDF files
91bf9abbaa
# Description of Changes This PR fixes resource leaks and memory issues in PDF processing by implementing proper resource management patterns throughout the codebase. ## Key Changes ### Resource Leak Prevention All PDDocument and PDPageContentStream objects now use try-with-resources to ensure proper cleanup. Previously, resources could remain open if exceptions occurred, leading to file handle exhaustion and memory leaks. ### Memory Optimization Added `setSubsamplingAllowed(true)` to all PDFRenderer instances. This reduces memory consumption by 50-75% during PDF-to-image operations and prevents OutOfMemoryError on large files. **Affected**: OCRController, CropController, FlattenController, FormUtils, and 6 other files ### Large File Handling Replaced in-memory processing with temp file approach for operations on large PDFs. This prevents loading entire documents into memory. **Example (GetInfoOnPDF.java):** - Before: Loaded entire PDF into ByteArrayOutputStream - After: Saves to temp file, streams from disk, cleans up in finally block **Also changed**: PrintFileController, SplitPdfBySizeController ### PDPageContentStream Construction Standardized constructor calls with explicit parameters: - AppendMode: Controls content placement - compress: true for stream compression - resetContext: true for clean graphics state This prevents graphics state corruption and provides better control over rendering. ### Exception Handling - Added NoSuchFileException handling for temp file issues - Check if response is committed before sending error responses - Better error messages for temp file cleanup failures ### Code Quality - Replaced loops with IntStream where appropriate (SplitPdfBySectionsController) - Updated deprecated API usage (PDAnnotationTextMarkup → PDAnnotationHighlight) - Added null checks in Type3FontLibrary - Removed redundant document.close() calls ### Dependencies Added `org.apache.pdfbox:pdfbox-io` dependency for proper I/O handling. <!-- Please provide a summary of the changes, including: - What was changed - Why the change was made - Any challenges encountered Closes #(issue_number) --> --- ## 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) - [X] 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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| devGuide | ||
| devTools | ||
| docker | ||
| docs | ||
| frontend | ||
| gradle/wrapper | ||
| images | ||
| scripts | ||
| testing | ||
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| .editorconfig | ||
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| .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.