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Protect PDF

Add password protection to your PDF file online. Set permissions and restrict printing, copying or editing.



Protect PDF

Add password protection and permission controls to your PDF. 100% browser-based — your file and password stay on your device.

Click or Drag & Drop PDF File

Max 50MB

Protect PDF with Password Online Free – Encrypt & Secure Your PDF

Add password to PDF online | PDF encryption tool | Protect PDF from copying & printing | Free PDF security tool

Protect sensitive PDF documents with our free online PDF password protection tool. Add a user password to prevent unauthorized access, set an owner password to control what recipients can do, and configure permissions for printing, copying, editing, and annotation — all without uploading your file to any server.

This tool uses 128-bit AES encryption, which is the industry-standard security level accepted by all modern PDF viewers including Adobe Acrobat, Google Chrome, and Foxit Reader. Perfect for securing contracts, confidential reports, financial documents, and personal records.

How to Add Password to PDF – Step by Step

  1. Upload Your PDF — Click or drag and drop your PDF file (up to 50MB). It is loaded locally in your browser — never uploaded.
  2. Set Passwords — Enter a User Password (required to open the PDF) and/or an Owner Password (controls permissions). You can set one or both.
  3. Configure Permissions — Choose what the recipient can do: Allow or deny printing, copying text, modifying the document, and adding annotations.
  4. Download Protected PDF — Click "Protect PDF & Download". Your password-protected PDF is saved instantly to your device.

User Password vs Owner Password – Key Differences

Password Type Purpose Required to Open? Controls Permissions?
User Password Prevents unauthorized opening of the PDF Yes No
Owner Password Restricts printing, copying, editing No Yes
Both Passwords Full protection — blocks opening AND permissions Yes Yes

Key Features

128-bit AES Encryption
Industry-standard AES encryption that is accepted by all major PDF viewers and document management systems.
Permission Controls
Granular control over printing, copying, modifying, annotating, and form-filling permissions.
Zero Server Upload
Your PDF and password are processed entirely in your browser. Nothing is ever sent to any server.
100% Free
No subscription, no registration, no watermarks. Protect unlimited PDF files for free.

Frequently Asked Questions

This tool uses 128-bit AES encryption, which is the PDF standard (PDF 1.6+). It is compatible with Adobe Acrobat Reader, Google Chrome PDF viewer, Foxit Reader, and all modern PDF applications.

A user password is required to open and view the PDF. An owner password controls what the viewer can do after opening (print, copy, edit). You can set one or both. If you only set an owner password, anyone can open the file but cannot perform restricted actions.

Yes. The Permissions section lets you independently control printing, copying, modifying, and annotating. Simply check or uncheck each permission before downloading.

Yes — and you will also be locked out. Always remember the password you set. There is no password recovery feature, so store it safely.

Yes. The password protection is standard PDF encryption (AES-128), which is supported by Adobe Acrobat, Google Chrome, Safari, Foxit, and all modern PDF readers and operating systems.
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