CSV Change Audit – Offline CSV Compare by Multiple Columns

Compare two CSV exports by one or more columns that identify a record. Match line items using order ID and line number together, even if the exports are sorted differently. See added and removed records, individual field changes, and headers that appear in only one file. Export a JSON report.

The ZIP includes an offline HTML tool, a quick-start guide, and two sample CSVs. Open the HTML in a modern desktop browser. Each file must be UTF-8 comma-separated CSV, up to 5 MiB, 25,000 records, and 100 columns. Files stay in your browser.

Values are compared exactly as text. The tool reads your files and leaves them intact. Keep generated reports private if the inputs contain personal data. Developed with AI assistance and tested.