Protect PDF: Online PDF Protector

Add passwords to your PDF documents online for free without facing any hurdles. Preview the password protected document and access the document by entering the password first. Perfect for adding a security layer to your sensitive documents.

How to Password Protect a PDF?

Step 1
The process is as simple as it can be, even a fifth-grader could do it. Upload the document by clicking the upload icon and selecting your file from Dropbox or your local computer. You can also drag and drop the PDF.
Step 2
Click on the settings icon to open the protection options.
Step 3
Enter the password in the provided box. Choose a strong password— ideally with special characters or numbers—to maximize security.
Step 4
Click the convert icon, and within seconds, your file will be ready.
Step 5
To preview the protected file, re-enter your password. Make sure you remember it—without it, you can’t unlock the file.
Step 6
Click download, and your PDF is now ready to be safely shared.

Key Features

Advanced Encryption for Maximum Security

Our tool uses industry-standard AES 256-bit encryption to lock your PDFs so only those who know the password can view their contents. Files are automatically deleted from our servers immediately after processing to keep your confidential data safe and secure.

User-Friendly Design

Our tool is super easy to use, regardless of your technical know-how, and there’s no need for third-party software installation on any other device.

Unlimited File Handling

Handle big PDFs with no size limits—perfect for reports, legal papers, or personal archives. Batch processing support allows you to secure multiple files at once, saving you valuable time.

Clean Output Without Distractions

Get professional-quality protected PDFs free of watermarks or gimmicky content. Multilingual capabilities allow users worldwide to access the tool in English, Spanish, and French.

Preview Options

Easily preview your PDFs by clicking the eye icon after conversion. You’ll need to enter the same password you set earlier—so be sure to remember it!

Unique Advantages

AI-Powered Password Optimization

With the help of AI, our tool spots weaknesses in your selected password instantly and provides personalized tips to make it stronger while keeping it easy to remember. This ensures your PDF is always secured with the strongest possible password.

Seamless Cloud Storage Integration

Easily upload and download using platforms like Google Drive or Dropbox. This integration streamlines workflows—especially for remote teams—by providing secure file management directly within the tool.

Free & No Watermark

Our tool is 100% free, with no hidden charges or intrusive ads. You can use your converted PDFs anywhere in the world without worrying about watermarks or restrictions.

Security Compliance

GDPR Certified:

We comply completely with GDPR (General Data Protection Regulation), which is proof that we have taken aggressive steps towards the security of users’ data.

ISO Certifications:

We are certified by ISO, which is again a trademark for our keen interest in protecting users’ privacy and their data.

Auto-Delete All Files:

All files that users upload for conversion are automatically deleted from our servers within an hour, which ensures the user’s data protection.

Frequently Asked Questions

Why is AES-256-bit encryption better for PDF?

AES-256 is a military-grade encryption, meaning it locks your file’s data so securely that it’s nearly impossible to crack without the password. It prevents brute force attacks, supports compliance with global data protection regulations, and is trusted by governments and businesses worldwide for protecting confidential documents.

Can I secure a PDF that has interactive forms or annotations?

Yes, our tool fully supports PDFs with forms, hyperlinks, and annotations. All interactive elements are preserved without issues.

So how does batch processing for several PDFs work?

Simply upload multiple files at once, assign unique passwords to each or reuse the same one, and click Convert. It saves significant time for users handling bulk documents like annual reports or client contracts.

Can we test the password before downloading?

Yes. After entering your password, you can preview the secured PDF by entering the same password before downloading.

What about PDFs with multimedia in them?

Protection applies to every element in the document, including videos, audio, and embedded images. The password is required for playback, ensuring files can’t be extracted or used without permission.