This web app is a PDF processing tool that runs entirely in your browser using Ghostscript WebAssembly. It provides three main features:
- Compress: Reduce PDF file size while maintaining quality
- Merge: Combine multiple PDF files into a single document
- Split: Extract specific page ranges from a PDF document
This project is a demo of another usage of the gs.wasm that @ochachacha compiled and ghostscript-pdf-compress.wasm. It takes any PDF and compress it via ghostscript.
The applied command is:
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook -dDownsampleColorImages=true -dColorImageResolution=150 -dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdf
The compression is now processed in a webworker so that the main thread doesn't become unresponsive and now there is virtually no limit to the size of the PDF that you can compress 🎉
To run the project, simply do the following steps
git clone https://github.com/krmanik/local-pdf-tools.git
cd local-pdf-tools
npm install
npm run dev# Development server
npm run dev
# Production build
npm run build
# Preview production build
npm run preview- Multiple quality presets (Screen, eBook, Printer, Prepress, Default)
- Advanced PDF settings (compatibility level, image downsampling)
- Custom Ghostscript commands for power users
- Combine multiple PDF files into one
- Drag-and-drop interface for file selection
- Quality settings for output optimization
- Extract specific page ranges
- Simple start/end page specification
- Maintains original quality
- Toggle between light and dark themes
- Persistent theme preference
- Respects system preference on first visit
All processing happens locally in your browser. No files are uploaded to any server. Your documents never leave your device.
https://krmanik.github.io/local-pdf-tools/
2025 krmanik. Code licensed under AGPLv3.
This project is licensed under the GNU Affero General Public License v3.0 – see the LICENSE file for details.
Ghostscript is released by Artifex under AGPLv3 and can be found here.
