Protect PDF
Encrypt your PDF with password protection and permission controls
Drop your files here
or click to browse
Protect PDF — Free Online Tool
Add password protection to PDF. This tool runs entirely in your browser — your files are never uploaded to any server. No sign-up required, no watermarks, no file size limits. Works on Windows, Mac, Linux, iPhone, and Android.
How to use Protect PDF
- Open this page in any modern browser (Chrome, Firefox, Safari, Edge)
- Drop your file(s) into the upload area or click to browse
- Adjust any settings if available
- Click the process button and download your result
Why choose Protect PDF?
- ✓100% private — files are processed in your browser, never uploaded
- ✓Completely free — no sign-up, no watermarks, no limits
- ✓Instant processing — no server queues, no waiting
- ✓Works everywhere — Windows, Mac, Linux, iOS, Android
Protect PDF — frequently asked questions
How strong is PDF password protection?+
Modern PDF encryption uses AES-256, the same standard used by banks and governments. A strong password makes brute-force attacks impractical.
What happens if I forget the password?+
There is no recovery mechanism. The file is permanently inaccessible without the password. Always store it somewhere safe.
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