Protect PDF
Add a password to your PDF, privately in your browser.
How to password-protect a PDF
- 1
Add your PDF
Drop or select the PDF you want to protect.
- 2
Set a password
Choose a strong password and which permissions to allow.
- 3
Encrypt & download
The PDF is encrypted on your device and ready to download.
Why protect PDFs in your browser?
Uploading a sensitive document to a website just to password-protect it defeats the purpose. PDFMergely encrypts the file on your device, so the unprotected version never leaves your computer and your password is never transmitted.
Frequently asked questions
Do you see my password?+
No. Encryption happens entirely in your browser. Your password and file are never uploaded, logged, or stored.
What encryption is used?+
Industry-standard AES encryption, applied locally with the same engine trusted by many PDF tools.
Can I control printing or copying?+
Yes, you can allow or restrict printing, copying and editing.
What if I forget the password?+
It cannot be recovered. Because nothing is uploaded, there is no copy anywhere, keep your password safe.