Password-protect a PDF online
Password-protect a PDF online for free, right in your browser. No uploads and no sign-up — your files never leave your device.
Drop files here or choose them
You can also paste files with Ctrl+V
Files never leave your device
Set a password to open a PDF. The file is encrypted with AES-256 right in your browser — the password and the document never leave your device.
How it works
- Choose a PDF file or drag it onto the page.
- Enter the password in the settings.
- Click Protect and download the protected PDF.
Frequently asked questions
What if I forget the password?
The file can’t be opened without it, and we can’t recover it: the password isn’t sent or stored anywhere. Keep the original file or save the password in a password manager.
Which apps can open the protected file?
Any modern PDF viewer: Adobe Acrobat Reader, web browsers, Preview on Mac and mobile apps. Very old programs without AES-256 support may fail to open it.
Is it free?
Yes. All tools are free, with no sign-up and no watermarks.
Are my files uploaded to a server?
No. Everything runs in your browser, so your files never leave your device.