Add a Password to a PDF
Encrypt your PDF so it can only be opened with the password you set.
How it works
1. Upload your PDF. 2. Type a password and confirm it. 3. Download — the file is encrypted (AES-256) so it can only be opened with that password.
Is my password sent anywhere?
No — encryption happens entirely in your browser. Your file and password never leave your device.
What if I forget the password?
There's no recovery — the encryption is real, so a forgotten password means the file can't be opened by anyone, including us. Keep it somewhere safe.
What encryption does this use?
AES-256, the current PDF standard encryption strength, via the widely-used open-source qpdf engine running in your browser.
Does this work on a mobile browser?
Yes — it's a regular web page, not an app, so it works the same way in a mobile browser as on desktop. Tap to pick the file, set a password, and download the encrypted result — the encryption still happens entirely on your device.
Does this restrict printing or copying, not just require a password to open?
No — it's a single password that's required to open the file. Once someone has entered it, they can print, copy, and edit like normal; there's no separate owner password or permission controls that limit what an already-authenticated reader can do. Worth knowing anyway: those "disable printing/copying" options other tools offer are only honored by well-behaved PDF readers — anyone can strip them by printing the file to a new PDF.
What makes a good password for this?
Something reasonably long that isn't a guessable word — not your birthday, not "password123". We only require 4 characters minimum so we don't block anyone, but since there's no permission system backing this up, that password is the only thing standing between someone and the file. Treat it like a real password.
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