Add a password to a PDF with AES-256 encryption, right in your browser — the file and the password are never uploaded. Optionally restrict printing, copying and editing. Free and unlimited.
Drop a PDF file here, or click to browse
AES-256 encryption runs in your browser — the file and the password never leave your device
Free & unlimited · AES-256 encryption runs locally in your browser — files and passwords are never uploaded · No sign-up required
Add a password to a PDF so it cannot be opened without it. AES-256 encryption runs entirely in your browser — the file and the password never leave your device.
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One PDF, up to 50 MB.
Set a password
Under Advanced you can also restrict printing, copying or editing.
Download
Open the encrypted file once to confirm the password prompt appears.
If you forget the password, the file cannot be recovered — save it in a password manager before you send it.
All current ones: Adobe Reader XI and later, Chrome, Edge, Firefox and macOS Preview, plus iOS and Android viewers. Software from before 2009 may fail on AES-256 — use 128-bit in a desktop tool if you must target it.
An open password encrypts the file — without it, nobody reads a single page. An owner password only sets permission flags, so a file with just an owner password still opens everywhere; the no-print and no-copy flags are honoured by well-behaved readers only.