PDF Password Protector
Add a password to any PDF — done entirely in your browser.
100% Private Instant Free
Drop your PDF here
or click to browse
How it works
Upload your PDF
Drop a PDF onto the upload area or click to browse your files.
Set a password
Enter the password you want to use to lock the PDF.
Download
Click Protect & Download — your password-protected PDF saves instantly to your device.
Frequently asked questions
Is my PDF uploaded to a server?
No. Everything runs entirely in your browser using pdf-lib. Your file never leaves your device.
Can I remove the password later?
Yes. Use the Unlock PDF tool on this site — upload the protected file and enter the password to remove it.
What encryption strength is used?
pdf-lib applies RC4 128-bit encryption, which is compatible with all modern PDF viewers.