Browser-Native Processing

Join Files Instantly

Upload Excel, CSV, or JSON files and perform relational joins directly in your browser.No server uploads. Zero infrastructure. 100% private.

Lightning Fast
100% Private
Multiple Formats

Upload Your Files

Drag and drop or click to upload your files

File 1

Upload CSV, Excel, or JSON file

File 2

Upload CSV, Excel, or JSON file

Join Configuration

Upload both files to configure the join operation

Why File Compare?

Everything you need for efficient data integration

Lightning Fast

Process millions of rows in seconds with optimized browser-native algorithms.

100% Private

All processing happens in your browser. Your data never leaves your device.

Multiple Formats

Support for CSV, Excel (.xlsx, .xls), and JSON files with automatic type detection.

Frequently Asked Questions

Everything you need to know about using File Compare

How do I join two CSV files?

What file formats are supported?

Can I join Excel and CSV files together?

How large can my files be?

Is my data secure?

What types of joins are supported?