Sometimes you need to lock a PDF with a password before sending; other times you have a locked PDF and need to unlock it (with the password). Doing this online avoids installing PDF software. A single tool that can both lock and unlock is especially handy.
To lock: upload the PDF, set a password, download the protected file. To unlock: upload the locked PDF, enter the password, download the unlocked file. Note that unlocking requires the correct password—these tools remove protection you can already open, they do not crack encryption.
Use our Lock / Unlock PDF tool to add or remove PDF passwords—free, with no signup.