🗜️
Compress PDF
OptimizeShrink PDF file size by re-encoding embedded images. Pick a quality level and get a smaller file in seconds.
📄
Drop a PDF or click to browse
🔒 100% Private
Files never leave your browser. No upload to any server.
⚡ Instant
Processing runs locally on your device. No queues, no waiting.
🆓 Free & Open Source
No signup, no watermarks, no limits. MIT-licensed code.
Frequently asked questions
How does this compressor work?
It rasterises each page to an image, re-encodes it as JPG at the chosen quality, and rebuilds a smaller PDF — fully in your browser.
Will text remain selectable?
Because pages are re-encoded as images, selectable text is lost. For text-heavy PDFs prefer a server-side tool that recompresses image streams only.
Is the file uploaded?
No. All processing stays on your device.