Protect PDF
Add a password and encryption to keep your PDF private. 100% free, secure and no sign-up required.
In-browser conversion coming soon
Real password protection needs proper AES encryption, which we won't fake with a weaker substitute. We're working on bringing true encryption to the browser.
About Protect PDF
Add a password and encryption to keep your PDF private. Everything runs through our fast, private pipeline — free, with no watermarks and no account needed.
How to use Protect PDF
- 1
Upload your file by dragging it into the box above or clicking to browse — files up to 100MB are supported.
- 2
Protect PDF starts automatically and runs securely in your browser, so your files never leave your device.
- 3
Preview the result, then click Download to save the converted file.
Protect PDF online — free and private
Add a password and encryption to keep your PDF private. Everything runs through our fast, private pipeline — free, with no watermarks and no account needed.
Unlike most online PDF services, this tool processes your document directly in your browser whenever possible — your files aren't parked on someone's server, there's no queue, no watermark and no page limits. It works on any device with a modern browser, including phones and tablets.
Frequently Asked Questions
Is Protect PDF free?
Yes, Protect PDF is completely free with no watermarks or sign-up.
Are my files safe?
Yes. Files are processed securely and deleted automatically shortly after processing.
Related Tools
Looking for something else? Browse all 842+ tools