Reduce PDF file size
Reduce a PDF’s size on your own device — no upload, no account. Start with lossless repacking, then add the image pass if you need a bigger reduction. Your file stays private.
Reduce file size, keep your privacy
Reducing a PDF’s size usually means an upload-your-file website. Here the reduction runs locally in your browser, so you cut the file size without giving up control of the document.
What actually gets smaller
Lossless repacking compresses the file’s streams and structure. The optional image pass re-encodes embedded images — the biggest lever on scan-heavy PDFs — while DPI down-sampling is deliberately left out of this first cut.
Your files never leave your browser
There's no upload. Everything happens on your device using WebAssembly — the bytes never travel to a server, so your documents stay yours. No ads, no third-party trackers, no accounts. We collect only an anonymous count of how often each tool is used. It's free, and it stays free.
How it works
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Drop in your PDF — Or click to choose one. It stays on your device.
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Choose how far to go — Lossless by default; add image re-encoding for a bigger size reduction.
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Download — Get a smaller PDF. Done.
Frequently asked questions
- How much smaller will the file get?
- It varies by document. Structural repacking helps every file a little; image re-encoding helps image-heavy PDFs a lot.
- Is my PDF uploaded to reduce it?
- No. The reduction happens entirely in your browser — the file never leaves your device.
- Are my files uploaded anywhere?
- No. Everything happens in your browser; files never leave your device.
- Is it really free?
- Yes — no account, no payment, no watermark on your output.