PDF Password Protect
Wrap a PDF in an AES-256 encrypted lock file with a password.
PDF tool
Drop a PDF to protect
or click to browse
application/pdf · up to 100MB
Uses AES-256-GCM with PBKDF2 (200k iterations). Anyone with the password and this tool can decrypt.
How to use PDF Password Protect
- Open PDF Password Protect. Open the tool page — no account or installation is needed.
- Add your input. Type, paste or upload the content you want to process.
- Adjust the options. Fine-tune the available settings until the preview matches what you need.
- Copy or download. Use the copy or download button to save the result to your device.
Frequently asked questions
Is the PDF Password Protect free to use?+
Yes. PDF Password Protect is completely free, with no signup, no watermark and no usage limits.
How does the PDF Password Protect work?+
Wrap a PDF in an AES-256 encrypted lock file with a password. Everything runs in your browser, so your input is processed on your own device.
Is my data uploaded to a server?+
No. This tool processes your input locally in the browser. Files and text never leave your device unless a tool explicitly states it calls an external API.
Can I use PDF Password Protect on mobile?+
Yes. The interface is responsive and works on phones, tablets and desktops in any modern browser.
Where can I find similar pdf tools?+
Browse the PDF Tools category for related utilities, or use the search box to find any tool instantly.