Security & Privacy
Protect PDF
Lock a PDF with a password.
Drop files here, or click to browse
PDF files only · stays on this device
Your password never leaves this browser tab — everything runs locally.
Private by design. Add a password and permission restrictions so only authorized people can open or edit your PDF. Your file is processed entirely in this browser tab using WebAssembly — it is never uploaded anywhere, so it stays yours even on a shared or offline computer.
Frequently asked questions
- Is my password sent anywhere?
- No. The password and your file stay in this browser tab the whole time — encryption runs locally, and nothing is ever uploaded.
- What is the owner password for?
- The owner password controls permissions like printing and editing. If you leave it blank, it defaults to the same password you use to open the file.
- What encryption does this use?
- PDFs are protected with 256-bit AES encryption, the current standard supported by most PDF readers.