pdf Tool · Free
Free Online PDF Compressor
Compress PDF online free. Reduce PDF file size instantly in your browser — no upload, no sign-up. Our PDF optimizer strips metadata and compresses streams.
Drop your PDF here to compress
PDF files only · Max 100MB
.pdf · Max 100MB
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🔒100% Private: Your files are processed entirely in your browser and never uploaded to any server.
Frequently Asked Questions
How does the PDF compressor work?
It uses pdf-lib, a WebAssembly-based library, to reload your PDF, strip metadata, and optimize object streams — all in your browser.
How much can I reduce my PDF size?
Results vary. Metadata-heavy PDFs can shrink 10–30%. Image-heavy PDFs may see moderate reductions.
Will compression damage my PDF?
No. We only strip unnecessary metadata and repack object streams. Text, images, and formatting are preserved.
Is there a file size limit?
The tool can handle PDFs up to 100MB. Very large files may be slow due to browser memory constraints.
Is this tool free?
Yes, completely free. No sign-up, no watermarks, and no file upload to any server.