Password protect a PDF
Encrypt your PDF with a password, or remove it from a document of yours when you no longer need it.
Free · no sign-up · your files never leave your deviceAdd a password to encrypt a PDF, or remove one from a protected file.
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🔒 100% private — your files are processed on your device and never uploaded to any server.
Works with files up to ~100 MB. Everything is processed on your device.
How to use Protect PDF
Add the PDF
The tool tells you if it is already protected.
Enter the password
To protect, type it twice. To remove it, type the password the file currently has.
Download
Get the encrypted or unlocked PDF.
What makes this tool different
- Standard encryptionCompatible with Adobe Reader, browsers and mobile readers.
- Strength indicatorYou are warned if the password is weak.
- LocalThe password and the file never leave your computer.
- Both directionsProtect or unprotect from the same tool.
Protect PDF: what it is for
Password protecting a PDF stops third parties reading sensitive documents if the file is forwarded or lost. Encryption happens in your browser, so neither the document nor the password travels over the internet.
Frequently asked questions
What if I forget the password?
It cannot be recovered: CruzForge stores neither passwords nor files. Write it down somewhere safe.
What makes a password secure?
At least 12 characters mixing upper case, lower case, numbers and symbols.
Can it be opened on a phone?
Yes, any PDF reader will ask for the password when opening it.
Can it unlock a PDF if I don't know the password?
No. Removing protection requires the current password; the tool does not crack or bypass passwords.