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© 2026 Toolkernel. All rights reserved.

Your files never leave your device. Built for developers who value privacy.

  1. Toolkernel
  2. /
  3. PDF Tools
  4. /
  5. Protect PDF

Protect PDF

Add password protection to your PDF documents

Your files never leave your device

Drop PDF file here

or click to browse your computer

Choose File
Max 50MB per file

How to Password Protect a PDF

  1. 1
    Upload Your PDF
    Drag and drop your PDF file or click to browse. All processing happens locally.
  2. 2
    Set Password
    Enter a strong password and confirm it. This password will be required to open the PDF.
  3. 3
    Configure Permissions
    Choose what users can do with the PDF: printing, copying, editing, and annotations.
  4. 4
    Download Protected PDF
    Click "Protect PDF" and download your secured document.

Permission Controls

Printing

Allow or prevent users from printing the document.

Copying

Control whether text and images can be copied.

Modifications

Allow or restrict editing of the document content.

Annotations

Control adding comments, highlights, and notes.

Why Password Protect PDF Documents?

Password protection is essential for sensitive documents that require controlled access. Whether you're sharing financial reports, legal contracts, or personal records, password protection ensures only authorized individuals can view the content.

Beyond access control, PDF permissions let you define what recipients can do with your document. You might allow viewing but prevent printing, copying, or editing. This is particularly valuable for draft documents, copyrighted materials, or documents under review.

For compliance with privacy regulations like GDPR, HIPAA, or industry standards, password-protecting PDFs containing personal or sensitive information is often a requirement. It provides an audit-ready security layer for document handling.

Common Use Cases

Confidential Business Documents

Protect contracts, financial reports, and proprietary information.

Legal Documents

Secure legal agreements, court filings, and sensitive case materials.

Medical Records

Protect patient information and comply with privacy regulations.

Academic Work

Secure research papers, theses, and intellectual property.

Client Deliverables

Protect design files, proposals, and project documents.

Personal Documents

Secure tax returns, identity documents, and personal records.

Tips for Strong Passwords

Use 8+ characters mixing uppercase, lowercase, numbers, and symbols for maximum security.

Avoid common words like "password", "123456", or personal information that can be guessed.

Use a password manager to generate and store complex passwords securely.

Write it down securely or use a memorable passphrase as the password cannot be recovered.

Frequently Asked Questions

What type of encryption is used?

The PDF is protected with password-based encryption that requires users to enter the correct password to access the document.

Can I recover a forgotten password?

No. Once protected, the password cannot be recovered. Make sure to store your password securely and consider using a password manager.

Can I remove the password later?

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

What permissions can I set?

You can control: printing, copying text/images, modifying the document, and adding annotations. Each can be independently enabled or disabled.

Is this secure for sensitive documents?

Yes, PDF password protection provides a strong layer of security. For highly sensitive documents, combine with other security measures.

Is my PDF uploaded to a server?

No. All processing happens locally in your browser. Your PDF and password never leave your device.

What's the difference between user and owner passwords?

A user password restricts who can open the PDF. An owner password controls what actions are allowed (printing, copying, editing). This tool sets a user password for access control.

Will recipients need special software?

No. Password-protected PDFs work in all standard PDF readers including Adobe Acrobat, web browsers, and mobile apps. Users simply enter the password when prompted.

Can I protect a PDF that's already password protected?

You'll need to unlock the PDF first using our Unlock PDF tool, then apply new password protection with your desired settings.

Is there a file size limit?

There's no strict limit, but very large files may take longer to process. Since everything happens in your browser, performance depends on your device's capabilities.

Related PDF Tools

Unlock PDF

Remove password protection

Add Watermark

Add text or image watermarks

Compress PDF

Reduce file size