100% free PDF tool
Add an AES-256 password to a PDF, in your browser.
or drop them here
Free, no sign-up
No account, no trial, no daily cap, no watermark on what you download.
Private by design
It runs in your browser, so your files and text never leave your device.
Keeps the original quality
Pages are changed, not re-printed, so text stays sharp and selectable.
Works on any device
Phone, tablet or computer - Windows, Mac, Android, iPhone and Linux, in any modern browser.
Your files are private. Everything happens in your browser. Your files never leave your device.
Adds a password to a PDF using AES-256, the encryption scheme current PDF readers expect. Without the password the file cannot be opened at all - not by a reader, not by this site's own tools. You can also tick which actions a reader should still permit once it is open, such as printing or copying text. Everything happens in your browser: the document and the password never leave your device.
The document is unrecoverable. There is no backdoor and nobody - including us - can open it for you. Keep an unprotected copy somewhere safe before you send the protected one out.
It uses AES-256, the strongest option in the PDF specification. The real limit is your password: a short or guessable one can be attacked offline, so use a long passphrase for anything that matters.
They are honoured by readers that follow the specification, which covers ordinary use. They are a statement of intent rather than a lock - a determined user with the password can work around them. The password itself is the part that genuinely protects the file.
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