579,412+ files processed
Free ad-supported tools, no payment or signup
Protected by Cloudflare
FAQ

Protect PDF with Password Online - Free PDF Security Tool

Secure your PDF documents with password protection and permission controls. Add encryption to prevent unauthorized access, restrict printing, copying, and editing. Our free online tool keeps your sensitive documents safe without requiring any software installation or registration.

Drag & Drop or click to choose a PDF

People will need this password to open the PDF. Leave it empty to apply restrictions only.

A strong password has:

  • At least 12 characters (not met)
  • Upper- and lowercase letters (not met)
  • At least one number (not met)
  • At least one symbol, for example ! ? # % (not met)
  • No common words or patterns, such as “password”, “123456”, “qwerty” or repeated characters (not met)

The strength check runs in your browser. Keep your password somewhere safe: PDF-Lab cannot recover it.

Restrictions (optional)

Tick what people should not be able to do. Unticked actions stay allowed.

How it works

  1. Upload your PDF: Add your document via drag & drop or click.
  2. Set password (optional): Add an open password, or leave blank to just set restrictions.
  3. Choose restrictions: Disable printing, copying, editing, or annotations as needed.
  4. Download secured PDF: Get your protected file instantly with your chosen settings.

Processing details, limits, and tips

Security and privacy

Your PDF is uploaded over HTTPS, protected on our server and returned to your browser; the server copy is deleted as soon as the protected file has been sent. Your password is used only to encrypt the file and is not stored. Nothing is kept or shared unless you choose Share this PDF, which uploads the protected PDF after you confirm and creates a link that expires after 24 hours.

What is PDF Password Protection?

PDF password protection is a security feature that encrypts your PDF documents to prevent unauthorized access, copying, printing, or editing. When you protect a PDF with a password, the document becomes encrypted using industry-standard encryption algorithms, ensuring that only users with the correct password can open and view the content.

There are two types of PDF passwords: a user password (also called an open password) that prevents opening the document, and a permissions password (owner password) that restricts specific actions like printing, copying text, or modifying the document. Our tool allows you to set both types of protection, giving you complete control over who can access and interact with your PDF files.

Password-protected PDFs are essential for sharing sensitive information such as financial documents, legal contracts, medical records, confidential business reports, and personal identification documents. By adding encryption to your PDFs, you can safely share them via email, cloud storage, or any other digital channel without worrying about unauthorized access.

How to Protect PDF Files with Password

1

Upload Your PDF

Click the upload area or drag and drop your PDF file. Our tool accepts PDF files of any size, and your document is processed securely in your browser before being encrypted on our server.

2

Set Your Password

Enter a strong password that will be required to open the PDF. Choose a password that combines uppercase and lowercase letters, numbers, and special characters for maximum security. You can also leave the password empty to apply only permission restrictions.

3

Configure Restrictions

Select which actions you want to restrict: printing, modification, copy/extract, and annotations/forms. Checked items will be disabled in the protected PDF, while unchecked items remain allowed for users who have the password.

4

Download Protected PDF

Click the "Protect PDF" button to encrypt your document. Once processing is complete, your password-protected PDF will automatically download, ready to be shared securely.

Why Use PDF Lab's PDF Protection Tool?

Strong Encryption

Protected PDFs use 256-bit AES encryption, the strongest encryption in the PDF standard. Combined with a strong password, it keeps your document private; the strength indicator shows how strong your password is as you type.

Flexible Permission Control

Choose exactly what users can and cannot do with your PDF. Restrict printing, copying, editing, and form filling independently for granular control.

No Registration Required

Start protecting your PDFs immediately without creating an account. Simply upload your file, set your preferences, and download the secured document.

Privacy First

Your files are processed securely and automatically deleted after processing. We never store or access your document content.

Works on Any Device

Our web-based tool works on Windows, Mac, Linux, iOS, and Android. No software installation needed - just use your web browser.

Completely Free

Protect unlimited PDFs without any cost. No hidden fees, no premium tiers, no watermarks added to your protected documents.

Common Use Cases for PDF Protection

Securing confidential business reports
Protecting financial statements
Safeguarding legal contracts
Securing medical records
Protecting academic research
Restricting ebook distribution
Securing tax documents
Protecting personal ID copies

Understanding PDF Permissions

Printing Restriction

When enabled, prevents users from printing the PDF document. Useful for digital-only distribution of sensitive materials that should not exist in physical form.

Modification Restriction

Blocks changes to the PDF content including text editing, page rearranging, and deleting pages. Essential for maintaining document integrity.

Copy/Extract Restriction

Prevents copying text and images from the PDF. Protects your content from being easily reproduced or plagiarized.

Annotations/Forms Restriction

Disables adding comments, highlights, and filling out form fields. Maintains the document in its original state without user additions.

Frequently Asked Questions

Is my PDF secure during the protection process?

Yes, your PDF is transmitted securely using HTTPS encryption. Files are processed on our secure servers and automatically deleted immediately after you download the protected version.

What happens if I forget my PDF password?

Unfortunately, we cannot recover lost passwords as we don't store them. Make sure to save your password securely. If you forget it, you'll need the original unprotected file to create a new protected version.

Can I protect a PDF without setting a password?

Yes! You can apply permission restrictions (like preventing printing or copying) without requiring a password to open the document. Simply leave the password field empty and check the restrictions you want to apply.

Will the protected PDF work on all PDF readers?

Yes. Protected PDFs use standard 256-bit AES PDF encryption, which opens in Adobe Acrobat and Acrobat Reader (version 9 or later), current web browsers such as Chrome, Edge, Firefox and Safari, and most modern PDF apps. Very old PDF readers that do not support AES-256 cannot open them.

Is there a file size limit?

Our free tool handles most typical PDF sizes. For very large files, processing may take a bit longer, but there are no strict size limits for standard use.

Can I remove protection from a PDF later?

Yes, if you know the password, you can use our Unlock PDF tool to remove password protection and restrictions from your PDF.

Protect Your PDF Documents Now

Secure your sensitive documents in seconds with our free online PDF protection tool.

Start Protecting PDFs

Related PDF Tools

ULUnlock PDF SGSign PDF MGMerge PDF CPCompress PDF

Related guides

All PDF guides
✓ Content copied!