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Compress PDF Without Uploading - 100% In-Browser

Compress PDF without uploading anything: the file is processed by WebAssembly engines inside your browser tab, so it never touches a server. Free, no signup, no file-size games.

Upload PDF

Local compression model

This tool rebuilds selected pages as compressed image pages. It works best for scanned and image-heavy PDFs. Text-heavy or already optimized PDFs may not shrink.

Upload a PDF and compress it locally to see the size report here.

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How to use

  1. Open the tool — the processing engine loads into your browser, not the other way around.
  2. Drop in your PDF and adjust the options. You can even disconnect from the internet now: compress pdf still works.
  3. Download the result. Check DevTools' Network tab if you like — you will see zero upload requests.

Frequently Asked Questions

Does my file leave my device?

No. Processing runs entirely in your browser via WebAssembly. You can verify it yourself: open DevTools → Network while processing — there is no upload request. See our /privacy-proof page for a live demonstration.

Why do other compress pdf sites upload my file?

Most PDF sites process files on their servers, which is why they need uploads, impose size limits and charge for volume. Sticraft ships the engine to your device instead, so there is nothing to upload and nothing to limit.