🔒 Free · No signup · Files stay private

Compress PDF Free Online — Reduce Size Up to 80%

Reduce PDF file size by up to 80%. Choose your compression level.

Compress PDF now → All tools
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Drop your file here

or click to browse — your file never leaves your browser

1

Upload PDF

Select your PDF file.

2

Pick level

Low, Medium, High, or Maximum compression.

3

Compress

Re-rendering happens locally.

4

Download

Smaller file downloads instantly.

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Up to 80%

Image-heavy PDFs shrink dramatically.

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4 Levels

You control the quality vs size tradeoff.

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No Watermark

Clean output, no branding added.

Frequently Asked Questions

Is this tool really free?

Yes — 100% free with no signup, no subscription and no limits. All processing happens in your browser.

Are my files stored anywhere?

Never. Processing happens entirely in your browser. Files never leave your device.

Is it secure?

Yes. PDF.js (Mozilla's open-source library) runs locally and ignores scripts embedded in PDFs.

Does it work on mobile?

Yes — iOS Safari 14+, Chrome and Firefox on Android fully supported.

Will there be a watermark?

No. CuroPDF never adds watermarks to your output files.