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About Protect PDF
Protect PDF — free, private, browser-based pdf tool
Add a password and set permissions on a PDF — all on your device. It takes PDF and gives you PDF. It runs in your browser, so the file is processed on your own device.
Why use Protect PDF
- ·Files stay on your device — nothing is uploaded
- ·No signup needed
- ·Works in any modern browser, on any OS
- ·Free daily use; Pro removes limits and watermarks
How to use it
- 1Drop a PDF file on the page, or click to choose one.
- 2Pick the options you want.
- 3Download the PDF file.
What Protect PDF does
Add a password and set permissions on a PDF — all on your device. The result is a PDF file you download directly.
How it works
pdf-lib and pdfjs-dist render and edit the PDF stream directly in your browser. Tesseract.js handles OCR with on-device language packs. The processing code runs inside the page, so your file is not uploaded to a server — you can confirm this in your browser's DevTools → Network tab.
Frequently asked questions
Does Protect PDF upload my files?+
No. Protect PDF runs in your browser and processes the file on your device. Nothing is sent to our servers.
Is Protect PDF free?+
Yes, with a daily free allowance and no signup. Xonvert Pro ($4.99/month) removes the daily limits and the watermark on exported files.
Do I need to install anything?+
No. It works in any modern browser on Windows, macOS, Linux, ChromeOS, Android and iPad.
Related pdf tools
Merge PDFs
Combine multiple PDFs into one — drag to reorder, instant export.
Split PDF
Split a PDF into pages or page ranges — one file each.
Rotate PDF
Rotate every page or just specific pages 90°, 180°, 270°.
PDF Info
See title, author, page count, creation date — all metadata at a glance.
Add Page Numbers
Stamp page numbers anywhere on every page — your format, your spot.
Add Watermark
Add a translucent text watermark across every page — DRAFT, CONFIDENTIAL, anything.