100% Private

Encrypt Excel

Excel File Merger provides a free, privacy-focused tool to lock your Excel files with a password. No signups, no uploads—just instant encryption.

Upload your spreadsheet
Drag and drop an XLSX, XLS, or CSV file to protect it
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What Is the Encrypt Excel Tool?

100% Private

Files never leave your computer.

Strong Security

Uses standard Excel encryption algorithms.

Fast & Free

No waiting times or paywalls.

Supports CSV

Instantly converts CSV/XLS to modern secure formats.

Instant Download

Your protected file is generated immediately.

No Installation

Works seamlessly in your web browser on any device.

Encrypt Excel Files Online

Excel File Merger provides a free, privacy-focused tool to lock your Excel files with a password. No signups, no uploads—just instant encryption.

What Is the Encrypt Excel Tool?

This tool is a free, browser-based utility that applies strong password protection to your Microsoft Excel formats (XLSX). It ensures your sensitive data cannot be opened without the correct password.

How to Encrypt Excel Files Online

  1. Select Your Document: Click the upload area or simply drag and drop your Excel (XLSX, XLS) or CSV file.
  2. Set a Strong Password: Type a secure password. Make sure you remember it, as we cannot recover lost passwords due to our strict privacy policy.
  3. Lock and Download: Hit the 'Encrypt File' button. The tool will instantly secure your file inside your web browser and download the protected version.

FAQ

Is it safe to encrypt sensitive Excel files here?+
Yes! We process everything directly on your device, meaning your data and password are never uploaded to our servers.
Can I recover my password if I forget it?+
No. The encryption is strong, and because everything runs locally, we do not store your passwords. If you lose your password, the data cannot be recovered.
Does this support older XLS files?+
We currently support encrypting the modern XLSX format which provides better security. Older XLS files might need to be converted to XLSX first.