Your files stay on your device

Compress PDF

Shrink a PDF by rewriting it with object streams and dropping extra metadata, a lossless pass with modest savings.

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PDF files · Without a password · stays on your device
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The rewrite happens in this tab and nothing uploads. How much you save depends on where the bytes live: documents written the old way, with loose cross-reference tables and unused objects, shrink the most. Scans and image-heavy PDFs keep their size in image data, so the lossless pass moves them little or not at all, and the result says so honestly instead of promising a percentage.

What this does not do: there is no image downsampling and no quality dial, because both would throw data away. If you need a much smaller scan, downsample the images first, then run this pass to trim the structure. Encrypted PDFs are refused; decrypt a copy first.
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More PDF & file tools

- Merge PDFs (/files/pdf-merge)
- Split a PDF (/files/pdf-split)
- Gzip files (/files/gzip)
All PDF & file tools (/files)

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