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

Choose Files

🔒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.

About This PDF Compressor

Compress PDF files online for free — no sign-up, no uploads, and no software required. This browser-based tool reduces PDF file size by optimizing embedded images and removing redundant data, all processed locally on your device.

How It Works

Upload your PDF and the tool uses pdf-lib compiled to WebAssembly to analyze and compress the document. Image-heavy PDFs (like scanned documents or reports with photos) typically see the greatest size reduction.

How Much Can You Reduce?

PDFs with photos: 40-80% size reduction
Text-only PDFs: 10-25% size reduction
Already compressed PDFs: 5-10% size reduction

Common Reasons to Compress a PDF

Gmail attachment limit is 25MB
Many job application portals limit uploads to 5-10MB
Government and university portals often have strict limits
Smaller PDFs load faster on mobile devices
Reduces cloud storage usage

Tips for Best Results

For the smallest possible file, remove unnecessary pages first using the Remove Pages tool, then compress.