Protect & Lock XLS

Secure your Excel spreadsheets with military-grade encryption. Add password protection to your XLS/XLSX files in seconds - no installation required.

Drag & Drop your Excel file here

or

Supports .XLS and .XLSX files

Secure Your Excel Files in Seconds

Protect & Lock XLS is a free online tool that allows you to add password protection to your Excel spreadsheets. With military-grade AES-256 encryption, your sensitive financial data, client information, and business reports remain secure from unauthorized access.

Why Use Our Excel Protection Tool?

  • Enhanced Security - Protect sensitive data with AES-256 encryption
  • Instant Protection - Secure files in seconds without installing software
  • No Backend Processing - All encryption happens in your browser for maximum privacy
  • Unlimited Use - Protect as many files as you need, completely free

How It Works

  1. 1. Upload your Excel file (.xls or .xlsx)
  2. 2. Set a strong password for encryption
  3. 3. Download your protected file with .protected extension
  4. 4. Share securely - recipients need the password to access the content

Frequently Asked Questions

Is this tool really free?

Yes, Protect & Lock XLS is completely free to use with no hidden costs or limitations.

How secure is my data?

Your files never leave your computer. All encryption happens in your browser using AES-256, the same standard used by governments and security experts worldwide.

Can I unlock files without this tool?

To unlock protected files, you'll need to use this tool and provide the correct password. There's no other way to access the content.

What's the maximum file size?

There are no file size limitations. However, very large files may take longer to process depending on your device's capabilities.

What encryption algorithm is used?

We use AES-256 (Advanced Encryption Standard) with 256-bit keys, which is the most secure encryption standard available today.