100% Private • Client-Side Only

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.

Zero Server Uploads
AES-256 Workbook Standard
Instant In-Memory Run

Upload your spreadsheet

Drag and drop an XLSX, XLS, or CSV file to protect it

Set Encryption Password
Required
Password Strength: Enter password0 / 4

Important: Because files are encrypted locally in your browser with zero server knowledge, passwords cannot be recovered if forgotten.

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Cryptographic Reliability

What Is the Encrypt Excel Tool?

Engineered for data protection officers, corporate finance teams, and independent professionals requiring immediate confidentiality.

100% Private

Files never leave your computer.

Client sandbox execution

Strong Security

Uses standard Excel encryption algorithms.

Standard AES standard

Fast & Free

No waiting times or paywalls.

Zero subscription tiers

Supports CSV

Instantly converts CSV/XLS to modern secure formats.

Automatic schema packaging

Instant Download

Your protected file is generated immediately.

Direct browser write

No Installation

Works seamlessly in your web browser on any device.

Cross-platform ready
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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

Frequently asked questions about local spreadsheet cryptographic safety.

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.