Encrypt a PDF with a password (AES-256). Runs in your browser.
The tool works entirely inside your web browser. Your files are processed on your own device and are never uploaded to a server, so they stay private. Closing the tab removes everything.
Upload your file via drag & drop or the upload box
Choose the options in the Settings panel (sensible defaults are pre-selected)
Click the green Protect PDF button — processing happens in your browser
Download your result with one click
Yes — free, with no sign-up, no watermark and no usage limit.
No. Everything runs on your device in the browser; nothing is sent to our server.
There is no fixed limit. Very large files depend on your device's memory and may be slower on older phones.
Yes. It works in modern browsers on Android, iPhone, tablets, Windows, Mac and Linux.