Password protect PDF online (AES-256), free and private
Encrypt a PDF with AES-256 in your browser. Your file and password never leave your device.
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100% private
Files are processed by your own browser and never sent to a server. Disconnect from the internet and it still works.
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Free, no limits
No sign-up, no watermark, no daily quota. Only your device's memory sets the size limit.
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Works offline
After your first visit, the tools keep working without an internet connection.
How to use Protect PDF
- 1Drop a PDF
- 2Choose a password and what readers may do
- 3Click Protect PDF and download the locked file
Frequently asked questions
›Are my files uploaded?
No. Roost PDF runs entirely in your browser: your files are processed on your own device and never sent to a server. You can even disconnect from the internet after the page loads and it keeps working. We only count anonymous page visits (Cloudflare Web Analytics, no cookies); your files and their contents are never sent anywhere.
›Is my password sent anywhere?
No. Encryption happens on your device, using qpdf compiled to WebAssembly.