Protect PDF

Add a password to encrypt and protect a PDF.

📂

Drag & drop files here

or click to select

PDF — up to 50 MB

How to use Protect PDF

1
Upload your PDF
Drag and drop or click to upload the PDF you want to password-protect.
2
Set a password
Enter the password you want to use. AES-256 encryption is applied locally in your browser.
3
Download your protected PDF
Click Protect and download your encrypted PDF.

Frequently asked questions

Is it really free?+

Yes. Protect PDF is 100% free — no sign-up, no watermarks. We cap usage at 10 operations per day per visitor to keep the service fast for everyone.

Are my files private?+

For most tools your file never leaves your browser — everything runs locally. For Office conversions (which need LibreOffice on our server), files are processed and deleted immediately after conversion.

Is there a file size limit?+

Browser-based tools depend on your device's memory; most files under 200 MB work fine. Server-side conversions are capped at 50 MB.

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