How strong is the encryption?

Files are encrypted with AES-256, the strongest standard PDF encryption, supported by Adobe Acrobat, Preview, Chrome and other modern PDF readers.

What if I forget the password?

It cannot be recovered — we never see or store it. Keep the original unprotected file somewhere safe.

Are my files uploaded to a server?

No. This tool runs entirely in your browser using JavaScript, so your files never leave your device and nothing is stored on our servers. It even keeps working if you go offline after the page has loaded.

Protect PDF

Every PDF task.
One calm place.

Unlock or protect

Add a password, or remove one you know.

Drop a PDF here

or browse files · processed on your device

To password-protect a PDF, drop it in, choose Protect, type a password and press Apply. The file is encrypted with AES-256, so it can only be opened with that password.

How to password-protect a PDF

Drop a PDF into the box above.
Make sure Protect is selected and type a password.
Press Apply to download the encrypted PDF.

Other PDF tools

Merge PDF Split PDF Compress PDF PDF to JPG JPG to PDF Rotate PDF Unlock PDF Sign PDF

Frequently asked questions

How strong is the encryption?: Files are encrypted with AES-256, the strongest standard PDF encryption, supported by Adobe Acrobat, Preview, Chrome and other modern PDF readers.
What if I forget the password?: It cannot be recovered — we never see or store it. Keep the original unprotected file somewhere safe.
Are my files uploaded to a server?: No. This tool runs entirely in your browser using JavaScript, so your files never leave your device and nothing is stored on our servers. It even keeps working if you go offline after the page has loaded.