Password-protect a PDF

Add a password to a PDF for free. AES encryption done in your browser: the file and password are never uploaded. The same tool removes a password you know.

Protect a PDF Get the Android app

Free. No account. The file stays on your device.

Lock a PDF with a password so only the people you give it to can open it. The document is encrypted with standard AES encryption that every PDF reader understands, including Adobe Reader, Chrome and phones.

Encryption happens on your device. Neither the file nor the password is sent anywhere, which is the whole point of protecting a document.

How it works

Tap Protect a PDF, then Protect Document in the PDF Tools list.
Choose the PDF and type the password twice.
Download the encrypted copy; the original is left untouched.

Why Document Reader

Private: encrypt PDF online without uploading anything; the work is done by your browser.
Works on any device: phone, tablet or computer, in Chrome, Safari, Edge or Firefox, and offline after the first visit.
One place for every file: lock a PDF with a password, plus PDF, Word, Excel, PowerPoint, images, eBooks and archives.
Rated 4.8 on Google Play by 688 people for the Android app.

Questions

Which encryption is used?

AES-256 as defined by the PDF standard, so the file opens in any modern PDF reader after the password is typed.

Can I remove a password from a PDF?

Yes, if you know it: see Unlock PDF. A forgotten password cannot be recovered.

Can I set an owner password that only blocks printing or copying?

The tool sets an open password. Restrictions on printing and copying are not enforced by most readers, so they are not offered.

Password-protect a PDF

How it works

Why Document Reader

Questions

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