Protect PDF Document

Add password encryption to your PDF document client-side for maximum security.

Max file size: Unlimited. 100% Free.

By proceeding, you agree to our Terms of Use.

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How to use our free Protect PDF Document tool in three simple steps

Follow our clean, secure, and fast three-step guide to run protect pdf document operations on your documents in seconds.

Select PDF document

Upload PDF

Upload the sensitive document you wish to encrypt with a password.

Set Password

Enter a strong open password to apply standard AES/RC4 encryption. Note: We operate a zero-upload model, so write it down safely; we cannot recover passwords.

Download file

Secure File

Confirm settings. Your file is encrypted in-browser and downloaded safely, locking copying, editing, or printing based on your chosen rules.

Need to do more with your files?

Try these related free, secure client-side tools next:

Sign PDF Electronic

Draw, type, or stamp your digital signature on files.

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Compress PDF Size

Shrink your secure PDF files down for easy email sharing.

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Protect PDF Quickly and Securely

Need to protect your without losing your original formatting? Our tool makes it incredibly easy to turn your documents into polished, professional files in just a few seconds. Whether you are finalizing a business contract, submitting a school assignment, or preparing a presentation, you can count on us to make sure your document looks exactly the way you intended on any device. Best of all, you can use our tool to protect your online completely free of charge.

How to Protect PDF Online

1. Upload Document

Simply drag and drop your file right into our secure upload box.

2. Secure Transfer

Your file is instantly protected by a secure 256-bit SSL connection.

3. Fast Processing

Our system quickly processes your file while keeping your layout perfectly intact.

4. Instant Download

Save your new, cleanly formatted file directly to your device and you are good to go!

Your Privacy and Security Come First

We know how important your privacy is. When you use our free Protect PDF tool, you can rest easy knowing we have strict security measures in place. Every file you upload and download is encrypted, meaning no one can intercept your data. To keep your information totally private, our system automatically and permanently deletes your files from our servers within two hours of your processing. We never read, analyze, or share your documents with anyone.

Frequently Asked Questions

Will my output look exactly like my original document?

Absolutely. We use advanced formatting technology to make sure your fonts, images, margins, and tables look perfect and remain exactly where you put them.

Is it safe to upload confidential documents?

Yes, it is completely safe. We use strong SSL encryption for all file transfers, and we permanently wipe your files from our secure servers within two hours.

Can I process files on my phone?

You sure can! Our website is fully optimized for mobile devices, so you can easily protect your online using your iPhone or Android browser—no extra apps required.

Are there file size limits for the free tool?

We do not put strict limits on file sizes for everyday use. Our powerful cloud servers are designed to handle even large documents quickly and efficiently.