Protect PDF with a password
Add AES-256 password protection to a PDF entirely in your browser. Set printing, copying, and editing restrictions without ever uploading your file.
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Select a PDF file
Drop a PDF here or click to choose. Up to 50MB.
Max file size: 50MB
or drag and drop · press Enter to browse
How to Use
- Select a PDF file (max 50MB).
- Choose a strong password and confirm it.
- Pick encryption strength and toggle permissions.
- Click Protect PDF to download the encrypted copy.
All processing is done in your browser, and files are never sent to a server.
Frequently Asked Questions
Encryption runs in your browser using qpdf compiled to WebAssembly. Your file and password never leave your device.
No. AES encryption is one-way without the password. Store passwords safely.
AES-256 uses a longer key and is more resistant to brute-force attacks. AES-128 is faster but still secure for most use cases.
Yes. The output uses standard PDF encryption that any modern PDF reader can prompt for.