Is the PDF compressor really free?

Yes — 100% free with no sign-up, no watermarks, and no paid tier. It runs entirely in your browser using open-source libraries.

What do the compression levels mean?

Low compression gives a modest size reduction while keeping quality high. Medium balances size and quality. High gives the smallest file size, which may reduce image quality in the PDF.

Is there a file size limit?

The tool supports PDFs up to 100MB. Larger files may be slow to process depending on your device.

Are my files sent to a server?

No. Everything runs inside your browser. Your PDF is never uploaded to any server and is deleted from memory when you close the tab.

Free PDF Compressor — Reduce PDF Size Online

Drop your PDF here or click to browse

PDF files only

Max file size: 100MB

Compression Level

Low (best quality) Medium (balanced) High (smallest size)

Best results on PDFs with images. Text-only PDFs may see minimal reduction.

Processing... 0%

Compression Results

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Original Size

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Compressed Size

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Size Reduction

Compressed PDF Ready!

Your PDF has been compressed. Click to download.

Privacy guaranteed: PDF compression runs entirely in your browser using PDF.js and pdf-lib. Your file is never uploaded to any server.

Important — Watermarks & Copyright: This tool re-renders PDF pages as compressed images. Watermarks embedded in the original PDF will remain visible — this tool does not remove them. Only compress PDFs you own or have explicit permission to modify. You are solely responsible for ensuring lawful use.

Compress PDF Files Free — Reduce PDF Size Online

Drop your PDF here or click to browse

Compression Level

Compressed PDF Ready!

How It Works

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