How to Password-Protect a PDF
Add a real password to a PDF before you send it, so the file stays locked no matter how it's shared.
Published by Filevolo · Report a correction
A payslip, contract, or ID scan attached to an email has no protection once it leaves your outbox - anyone who gets access to that inbox, a shared folder, or a forwarded message can open it. A password on the file itself travels with it no matter how it gets shared, which an account password or a "don't forward this" note in the email body never does.
Add the password
- Open Protect PDF and drop in the file.
- Type the password twice, then download the result.
What this actually does
This sets a real AES-256 open password on the PDF itself, the same encryption standard modern PDF readers use - not a watermark, not a cosmetic overlay, and not a login screen bolted on top of an otherwise-readable file. Without the password, the file's contents are genuinely unreadable. The text and formatting stay exactly as they were; this encrypts the real PDF structure rather than rebuilding each page as an image, so anyone who enters the correct password gets a normal, selectable, searchable document, not a flattened picture of one.
Don't lose the password
There is no way to recover it afterward, from Filevolo or anyone else - that's what makes the encryption real rather than cosmetic. Save it in a password manager before you send the file, not just in the email you're about to attach it to.
Changed your mind later?
If you need the file to open freely again, use Unlock PDF with the same password. That tool rebuilds each page as an image to remove the lock, so it trades away selectable text to do it - worth knowing before you unlock something you still need to copy text out of or edit later.
Common questions
What encryption does this use? AES-256, the current PDF 2.0 standard and the strongest option that today's PDF readers broadly support.
Will the file still look and read normally once unlocked? Yes. Entering the password opens a completely normal PDF - the same text, layout, and formatting as the original, nothing rebuilt or flattened.
Is the file or password uploaded anywhere? No, the whole process runs in your browser. Your password never leaves your device.