Protect PDF

Encrypt your PDF with a password to keep data confidential

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Select PDF files

or drag & drop anywhere — single file

How to Protect PDF

Upload your PDF

Click 'Choose Files' or drag and drop the PDF you want to protect.

Set a password

Enter and confirm a strong password (minimum 4 characters).

Encrypt PDF

Click the 'Protect PDF' button to apply AES-128 encryption.

Download protected file

Download your password-protected PDF.

Why Use Our Protect PDF Tool

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100% Private

Your files never leave your device. All processing happens locally in your browser.

⚡

Lightning Fast

No waiting for server uploads. Processing starts instantly on your device.

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100% Free

No sign-up, no hidden fees, no watermarks. Free forever with no file limits.

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Works Everywhere

Use on any device — desktop, tablet, or phone. No software installation needed.

Frequently Asked Questions

How secure is the PDF encryption?

We use AES-128 encryption, a widely trusted standard. The password is never transmitted anywhere — encryption happens entirely in your browser.

Can I remove the password later?

Yes, use our Unlock PDF tool. Enter the password you set and download an unprotected copy of the document.

What encryption standard is used?

We use AES-128 encryption, a widely trusted standard for document security.

Will the encrypted PDF work everywhere?

Yes, password-protected PDFs are compatible with all major PDF readers including Adobe Acrobat, Preview, and browser-based viewers.

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