Protect PDF files online for free with our easy PDF Security tool. Add password protection and supported restrictions to help secure documents from unauthorized access or changes.
or drop pdf file here
Protect PDF helps secure documents by adding password protection and controlling permitted actions. Set a password for opening the file and, where supported, restrict activities such as editing, copying, or printing. It is useful for contracts, financial records, business reports, personal documents, and other files containing sensitive information. Apply the security settings that match your requirements before sharing or distributing the protected PDF.
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 and the tool handles the rest. No manual adjustments or software needed.
Everything runs directly in your browser. Your files never leave your device — 100% private.
Works on any modern browser on desktop, tablet or mobile — Mac, Windows, iOS, Android.
No subscriptions, no sign-ups, no hidden fees. Use Protect PDF as many times as you need.
Our PDF engine preserves fonts, layouts and formatting so your output looks exactly as expected.
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.