PDF Compress Tool
Reduce PDF file size with browser-side compression settings.
Drop PDF files here
or click to browse
All processing is local · Nothing is uploaded
Processing...
Done
How to Use This Tool
- Drop or browse for one PDF.
- Adjust render scale and JPEG quality sliders.
- Click Compress PDF and download the optimized version.
Common Use Cases
- Reducing email attachment size
- Preparing upload-friendly PDFs for web forms
- Optimizing scanned PDFs with large image content
- Shrinking PDFs for archival storage
Tips for Best Results
- A quality of 0.70-0.80 gives good balance between size reduction and visual quality.
- Lower the render scale for documents you only need for on-screen reading.
- For text-heavy PDFs, compression may not reduce size much since the text itself is small.
Frequently Asked Questions
Will compression affect text quality?
Yes — pages are re-rendered as images. Searchable/selectable text is converted to image text.
How much smaller will my file be?
Depends on content. Image-heavy PDFs can shrink 50-80%. Text-only PDFs may not shrink much.
Important Notes
- Compression works by re-rendering pages to JPEG images, which reduces searchable text.
- Higher quality values produce better-looking but larger files.
- The before/after file size comparison is shown in the result.
- All tools run fully in your browser. Your files are not sent to our server.
- Safe and free to use: no login, no signup, no paywall.
- Libraries used: PDF-Lib (MIT), PDF.js (Apache 2.0), Mammoth.js (BSD-2), JSZip (MIT).
- If you find a bug, please report it in the comments.
Comments & Discussion
Facing issues? Have questions? Post them here! We're happy to help!