Encrypt PDF

Runs locally

Password-protect your PDF document.

Open a PDF

or click to browse · PDF only

PDF · up to 100 MB

How it works

The file is read in your browser. Nothing is sent to a server.
Processing runs on your device. WebAssembly and Web Workers keep large files responsive.
Download the result. Your file is not kept once you close the tab.

Next steps

Reduce PDF file size without losing quality.

Edit PDF text, add shapes, forms, links, whiteout, and sign documents online.

Combine multiple PDF files into one document.

Split a PDF into multiple separate files.