PDF Password
Add real AES-256 password protection.
Uses qpdf (compiled to WebAssembly) for real AES-256 encryption — the output truly requires the password to open. Tested in Chrome PDF viewer, Adobe Acrobat, and Preview.
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Private
Files never leave your browser.
Fast
Native client-side processing.
Free forever
No signup, no watermarks.
About PDF Password
Add a real AES-256 password to your PDF. Files stay in your browser. The encrypted file requires the password to open in any PDF reader (Chrome, Acrobat, Preview).
PDF Password runs entirely in your browser using PDF Tools technology. Your files are processed locally and never uploaded to a server — there is no cloud, no storage, and no account required. Nothing about your file is sent anywhere.