Compare Excel & CSV Files
In Seconds

Free, secure, no downloads. Upload files, click compare, get highlighted differences instantly.

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Why Choose Our Tool?

Lightning Fast
Lightning Fast
Compare files in seconds, not hours of manual checking. Our optimized algorithms process even large datasets quickly.
100% Secure
100% Secure
Files never leave your computer - all processing is local. Your sensitive data stays private and secure.
Multiple Formats
Multiple Formats
Supports Excel (.xlsx, .xls) and CSV files with multiple sheets. Choose specific sheets to compare.
Precise Results
Precise Results
Highlights exact differences with detailed comparison reports. Filter and sort results for easy analysis.
Always Free
Always Free
No subscriptions, no hidden costs, no limitations. Professional-grade tool available to everyone.

How MaksPilot Was Born

"This is how my MaksPilot project was born, which currently solves the following problems:"

📊 Multi-Format Support

  • Excel to Excel comparison (.xlsx, .xls)
  • Excel to CSV comparison
  • Full support for Excel worksheets/tabs
  • Choose specific sheets to compare

🔒 100% Browser Processing

  • File processing completely in browser
  • Not a single byte goes to the server
  • Your data never leaves your device
  • Works completely offline

🌐 Smart Format Recognition

  • Recognizes different CSV separators (`;`, `,`, `\t`)
  • Automatically detects file encodings
  • Handles various file formats seamlessly
  • No manual configuration needed

📅 Advanced Date Handling

  • Recognizes: 01-May-2025, 01.01.25
  • Handles: 01/01/25, 2025-01-01
  • Normalizes all date formats
  • Brings dates to single format for comparison

🔢 Smart Number Processing

  • Brings 17 and 17.0 to single format
  • Rounds decimals to two decimal places
  • Handles floating point precision issues
  • Ensures accurate number comparisons

⚙️ Advanced Comparison Logic

  • Converts all text to uppercase for comparison
  • Case-insensitive matching
  • Exclude specific columns from comparison
  • Flexible comparison rules

Your Data Stays Private

Unlike other comparison tools, we process everything locally in your browser. No file uploads, no server storage, no privacy concerns. Your sensitive data never leaves your device.

  • ✅ No file uploads to servers
  • ✅ No registration or login required
  • ✅ No data collection or tracking
  • ✅ Works completely offline
Security guard protecting files

How It Works & Security

🔒 100% Client-Side Processing

All file processing happens directly in your browser using JavaScript. No data is ever sent to any server.

  • Files stored in browser RAM only
  • No server-side processing
  • No cloud storage or databases

🛡️ Data Security

Your sensitive data is completely safe with multiple layers of protection:

  • No network requests with file data
  • Auto-cleared when page closes
  • No logging or analytics of content

⚡ How Processing Works

Advanced file comparison using modern web technologies:

  • FileReader API for local file access
  • XLSX.js library for Excel files
  • Smart fuzzy matching algorithms

🔍 Data Lifecycle

Complete transparency in how your data is handled:

  • Loaded → Processed → Displayed
  • Automatically cleared on reload
  • No permanent storage anywhere

🔐 Security Verification

You can verify our security claims yourself:

F12 → Network Tab
No file data in network requests
Disconnect Internet
Tool continues working offline
Open Source Code
All code is transparent and visible

Ready to Compare Your Files?

Stop wasting time on manual comparisons. Get accurate results in seconds.

Start Comparing Now