Are my files uploaded to a server?

No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.

How does the compression work?

Each page is rendered and re-encoded as a compressed image inside a new PDF, which dramatically reduces the size of image-heavy or scanned documents. Because pages become images, selectable text is flattened — great for sharing, less ideal if you need to copy text afterwards.

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Compress PDF

Reduce PDF file size in your browser.

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How to use the Compress PDF

1Drop your PDF into the box, or click to browse.
2Pick a compression level — more compression means a smaller file.
3Click Compress, then download your smaller PDF.

About the Compress PDF

Free PDF compressor — shrink large PDF files by re-compressing their pages, so they're easy to email and upload. Private and in-browser, with no watermark and no upload.

Part of our PDF Tools collection. Browse all tools.

Frequently asked questions

Are my files uploaded to a server?: No. This tool runs entirely in your browser — your files never leave your device, which makes it fast and completely private.
How does the compression work?: Each page is rendered and re-encoded as a compressed image inside a new PDF, which dramatically reduces the size of image-heavy or scanned documents. Because pages become images, selectable text is flattened — great for sharing, less ideal if you need to copy text afterwards.