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

Drop your PDF here or click to browse

Compression Level

Compressed PDF Ready!

How It Works

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