PDF Password Protect & Unlock
NEWProtect your PDF with a password using 256-bit AES encryption, unlock password-protected files, or optimize for fast web delivery — all entirely in your browser.
How to use PDF Password Protect
- Upload your PDF.
- Choose encrypt, unlock, or optimize.
- For encryption: set user and owner passwords and strength.
- Click Process and Download the result.
What is PDF Password Protect?
This tool uses qpdf compiled to WebAssembly to add, remove, or optimize PDF password protection entirely in your browser. Choose encrypt (128-bit RC4 or 256-bit AES), decrypt (remove an existing password), or linearize (optimize for fast web loading). Your file never leaves your device.
FAQ
- Is my PDF uploaded anywhere?
- No — everything runs locally in your browser using WebAssembly. Your file never leaves your device.
- What encryption strength should I use?
- 256-bit AES is recommended for modern security. 128-bit RC4 is available for legacy compatibility.
- Can I remove a password from a PDF?
- Yes — use the Remove Password action and enter the current password. The output will be an unprotected PDF.
- What does linearize/optimize do?
- Linearization restructures the PDF for faster web viewing — the browser can display pages as they download without waiting for the full file.
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