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Compare Two CSV Files - Find Differences

Compare two CSV files and find differences. Identify missing rows, new entries, and changes. processed locally in your browser.

Quick start

Built for find rows that are different (or matching) between two files.

Everything runs in your browser, so you can test the workflow with sample data when available before using production files.

Output: A new file or report produced locally in your browser.

  1. 1Choose a supported file or use sample data when available.
  2. 2Set the options shown for this workflow.
  3. 3Process the file locally, inspect the result, and download a new copy.
Preparing your private workspace…

How to Compare Files

  1. 1Upload two CSV files to compare
  2. 2Files are compared row by row
  3. 3Download report showing unique rows in each file

Why Use This Tool?

  • ✓Side-by-Side Comparison - See differences clearly
  • ✓Find Missing Data - Identify rows in one file but not the other
  • ✓Data Validation - Verify file synchronization
  • ✓Clear Results - See which rows are unique to each file
  • ✓Privacy First - All processing in your browser

Frequently Asked Questions

How does the comparison work?

The tool compares entire rows. If a row exists in File A but not File B, it's flagged as unique to File A.

What if column order is different?

Files should have matching column structures. Reorder columns first using the Column Manager if needed.

Can it show changed values?

The comparison identifies rows that are unique to each file. It does not provide a cell-by-cell change report.