Protect PDF
Add an open password so only people who know it can open the PDF. Your file and password never leave your browser.
Your files never leave this device. Everything is processed inside your browser and nothing is uploaded to a server.
How to use the Protect PDF tool
- Click "Choose PDF file" or drag the PDF you want to protect onto the screen.
- Enter the same password in "New password" and "Confirm password".
- Click "Protect PDF".
- When it is done, click "Download". The new PDF asks for the password when opened.
Frequently asked questions
Are my files uploaded to a server?
No. Files are processed only inside your browser and are never sent to any server. Only the code and character mapping data needed for processing are downloaded from this site; your files themselves never leave your device. You can check this yourself in the Network tab of your browser's developer tools.
Are my files safe even with ads on the page?
Yes. Ads only run outside the tool area. The tool area, where you choose and process files, is an isolated space your browser keeps separate, so other scripts on the page, including ads, cannot read your file content or file names. Nothing inside the tool area can be sent out. When you drag a file onto the page, the tool area expands to fill the screen so the isolated space receives the file.
How is the PDF protected?
It uses AES-256 encryption from the PDF standard. Most programs, including Adobe Acrobat, browsers and phone PDF viewers, can open it once you enter the password.
What if I forget the password?
The PDF cannot be opened. The password is not stored anywhere, so we cannot recover it for you. Keep a copy of the original PDF.
Is my password sent to a server?
No. Both the file and the password are processed only on this device and are never sent anywhere.
Can I change the password of a PDF that is already protected?
Yes. Enter the current password when you open the file, then set a new one. The new PDF only opens with the new password.