About Compress PDF AI.
A free PDF compressor that does not upload your file. It runs entirely in your browser, so your documents never leave your device.
What it is
Compress PDF AI shrinks PDFs to exact sizes — 20 KB, 50 KB, 100 KB, 200 KB, 500 KB or 1 MB — without sending anything to a server. The compressor reads your file into the tab's memory, rebuilds it with pdf-lib, recompresses images through the Canvas API, and writes the result back as a local download.
It was built because every other "free" online compressor asks you to upload a private document and trust a deletion policy. This one has nothing to delete, because nothing is sent.
Privacy by design
- No file uploads, ever
- No accounts or sign-up
- No email collection
- No analytics or tracking scripts
- No cookies set by this site
- No watermarks or injected pages
Offline first
Once the page has loaded, you can turn off Wi-Fi and still compress a PDF. That is the simplest proof that nothing leaves your device. The app shell is cached by a service worker so the compressor keeps working after your first visit.
Honest results
A target is marked as met only when the measured byte count of the finished file is at or below the limit. If a target cannot be reached, you see the smallest real result with a clear explanation — never an estimate or a false promise.