Protect PDF

Add a password and encryption to secure your PDF.

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Drag and drop files here

or click to select files

Browse Files

info PDF files only, max 10MB per file

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How to Password Protect a PDF Online

Keep sensitive documents private — password protect your PDF with strong AES encryption. Need to remove a password you already have? Use Unlock PDF. You can also add a watermark for extra deterrence.

Password Protect a PDF in 3 Easy Steps

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1Upload your PDF

Drop in the PDF you want to secure, or click to select it.

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2Set a password

Type the password that will be required to open the file.

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3Download the protected PDF

Encrypt and download your password-protected PDF.

Illustration of a PDF document secured with a padlock and password

Why use EraserPro to password protect your PDF

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100% Free

Password protect your PDF without paying a cent — no watermarks and no forced sign-up.

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Private & Secure

Everything runs in your browser — files are never uploaded, so your data never leaves your device.

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No Installation

Works right in your web browser — there's nothing to download or install.

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Any Device

Use it on Windows, macOS, Linux, iOS or Android — the experience is seamless everywhere.

Frequently Asked Questions

Is my PDF uploaded to protect it?

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No — encryption runs entirely in your browser, so the file and password never leave your device.

What encryption is used?

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Your PDF is secured with 256-bit AES encryption, the modern standard for document security.

What if I forget the password?

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There is no recovery — only someone with the password can open the file, so store it safely.

Is protecting a PDF free?

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Yes, adding a password is free with no watermark.