Free · No sign-up · No watermark
Upload a PDF, choose a password, and download a protected copy in seconds. Nobody opens it without the password you set.
More PDF tools
Add a password so only the right people can open it.
Combine several PDFs into one file, in order.
Remove a password you know from a PDF.
Shrink file size while keeping quality.
Pull out the pages you need.
Turn pages the right way up.
How it works
Drag it into the box or pick it from your device.
This is the password people will type to open the file.
Your locked PDF downloads straight away.
Upload your PDF, type the password you want, and click Protect PDF. The protected file downloads instantly.
Yes — protecting, merging and unlocking PDFs is free, with no sign-up and no watermark.
No. Unlock only removes a password you already know — it is not a password cracker.