🔒 Free · No signup · Files stay private

Password Protect PDF Free — Encrypt & Secure

Password-protect your PDFs with encryption.

Protect PDF now → All tools
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Drop your file here

or click to browse — your file never leaves your browser

1

Upload PDF

Select your file.

2

Set password

Enter and confirm your password.

3

Encrypt

AES encryption applied locally.

4

Download

Get your protected PDF.

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AES Encryption

Industry-standard password protection.

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Restrictions

Optionally disable printing and copying.

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Private

Password never sent to any server.

Frequently Asked Questions

Is this tool really free?

Yes — 100% free with no signup, no subscription and no limits. All processing happens in your browser.

Are my files stored anywhere?

Never. Processing happens entirely in your browser. Files never leave your device.

Is it secure?

Yes. PDF.js (Mozilla's open-source library) runs locally and ignores scripts embedded in PDFs.

Does it work on mobile?

Yes — iOS Safari 14+, Chrome and Firefox on Android fully supported.

Will there be a watermark?

No. CuroPDF never adds watermarks to your output files.