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 locally in your browser — strength is whatever the library implements.
Sending a salary PDF or a medical form through email is bad enough; leaving it unlocked is worse. Encrypt sets a user password via @cantoo/pdf-lib with restrictive permissions (no modify/copy/forms; printing still allowed at high res).
We do not advertise a specific AES bit length beyond what that library implements — check its docs if you need a compliance checkbox. This is not government-grade document DRM.
Remove password unlocks when you already know the password. We will not “crack” a file for you.
How to use Encrypt PDF
- 1Drop a PDF.
- 2Enter a password you will remember (or store in a password manager).
- 3Download the locked file.
What it won't do
- Not a full Adobe policy server or certificate-based DRM.
- Forgot password means the file stays locked — we cannot recover it.
Common questions
What encryption strength do you use?
Whatever @cantoo/pdf-lib implements for encrypt(). We do not invent a marketing bit-length claim on top.
Can recipients print?
Yes — printing is allowed in the permission set we apply. Copy and modify are restricted.
Is the PDF uploaded to lock it?
No.
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