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Your files are secure
Encrypt your PDF with a user password so only authorized people can open it.
Drag & drop your file into the tool above, or click Choose Files to browse.
Adjust any settings in the panel on the right to match your needs.
Click the action button and wait a moment while we process your file.
Download your result instantly — 100% browser-based, nothing leaves your device.
Built for speed, privacy and reliability — on any device.
Just upload your file, adjust any settings, and click the button. Done in seconds with no learning curve.
Everything runs locally in your browser. Your files never leave your device — complete privacy guaranteed.
Use Protect PDF on Windows, Mac, Linux, iOS or Android — any modern browser works perfectly.
No account needed. Protect PDF is completely free with no file size limits for standard documents.
Output files follow the PDF specification, ensuring compatibility with Adobe Reader, Preview and all major viewers.
Yes, Protect PDF is completely free. There are no hidden fees, subscriptions or account requirements. Just open the tool and start.
Protect PDF runs entirely in your browser. Your files are never uploaded to any server — they stay on your device the whole time, so your data is always private.
There is no hard file size limit enforced by the tool. Very large files may take longer to process depending on your device's memory and browser performance.
Yes. Output files conform to the PDF standard and open correctly in Adobe Acrobat, Adobe Reader, macOS Preview, Chrome, Firefox and all other major PDF viewers.
The tool works in all modern browsers including Google Chrome, Mozilla Firefox, Microsoft Edge, Safari and Opera. We recommend keeping your browser up to date for the best experience.
Protect PDF files with a password