DocomintProtect PDF with a Password
Add a password to a PDF (AES-128) so it can't be opened without it, entirely in your browser.
🔒 Processed on your device
Drop your PDF here
or choose a file
How it works
- Add a PDF file
- Set a password
- Download the password-protected PDF
Frequently asked questions
Is my file uploaded anywhere?
No — this tool runs entirely in your browser using JavaScript/WebAssembly. Your file is never sent to a server.
Is there a file size limit?
Free accounts can process files up to the limit shown on this page; signing up for Pro raises that limit substantially.