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Your files never leave this device

Lock a PDF in seconds

Pick a password and download a locked copy. The encryption happens on your device, so the file and the password never travel anywhere.

or drop it anywhere on this page

Use at least 8 characters. A few unrelated words make a strong password that is easy to type.

Encryption
Limit printing, copying and editing

Untick anything people should not be able to do.

Optional. Lets you change the limits later in apps such as Acrobat. Most PDF apps respect these limits, but they are a request rather than a lock: only the open password truly keeps people out.

How the password protects your PDF

Your PDF is encrypted with AES-256, the standard used by Adobe Acrobat, Preview, Chrome, Edge and every current PDF app. Without the password the pages, text and pictures inside are scrambled, and anyone who opens the file is asked for the password first. AES-128 is offered for very old readers that cannot open AES-256 files.

Pick a password you will remember

Nobody can open the locked copy without the password, and that includes us: there is no reset link and no back door. Keep the original file somewhere safe, or store the password in a password manager. Longer is stronger, so a short sentence or a few unrelated words beat a single word with symbols.

Privacy

The encryption happens in your browser. Your PDF and your password are never uploaded, logged or stored, and the locked copy is saved straight to your device.

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