Encrypt PDF
Password-protect a PDF locally. Strength is what the library implements.
Runs in this tab. The file stays here.
About Encrypt PDF
Password-protect a PDF in the browser.
Encryption is provided by @cantoo/pdf-lib. We do not advertise a specific AES bit length beyond what that library implements — check its docs if you need a compliance claim.
Everything runs in this tab. The PDF never leaves your device for a server to process.
How to use Encrypt PDF
- 1Drop a PDF.
- 2Enter a password.
- 3Download the locked file.
Common questions
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation