CSV Diff is a free tool for comparing two CSV or TSV files with a visual table-based diff. It highlights added, removed, and modified rows and shows cell-level changes within modified rows. Perfect for data migration testing, spreadsheet comparison, and database export validation.
Compare CSV data in three steps — paste, configure, and inspect.
Enter the original CSV in the left panel and the updated version in the right. You can paste directly from spreadsheets, database exports, or .csv files.
Indicate whether the first row contains headers and select the delimiter (,, \t, |, or custom). Click Compare to start the diff.
Results appear in a table view with added rows in green, removed rows in red, and modified cells highlighted in yellow. Scan columns quickly to find exactly what changed.
Export two versions of a Google Sheets or Excel file as CSV, then paste them here to see which rows and cells were modified between versions.
Run the same query against staging and production, export the results as CSV, and diff them to verify data consistency across environments.
Compare the output of an ETL pipeline before and after a code change to ensure that transformations produce identical results. Catch rounding errors, missing rows, or column mismatches.
Paste or type your CSV data into the left and right panels, then click Compare. The tool parses each CSV, aligns the rows, and highlights added, removed, and modified cells with color coding. You can change the delimiter if your data uses tabs, semicolons, or pipes.
A CSV diff is a structured comparison of two CSV (Comma-Separated Values) datasets. Unlike a plain text diff, a CSV diff understands rows and columns — it compares cell values and highlights exactly which fields changed between two versions of tabular data.
Yes. All processing happens in your browser using client-side JavaScript. Your CSV data is never uploaded to any server, so it's safe to compare spreadsheets containing sensitive business data, financial records, or personal information.
The tool supports comma (,), tab, semicolon (;), and pipe (|) delimiters. You can select the delimiter that matches your data format. This makes it compatible with CSV exports from Excel, Google Sheets, databases, and most data tools.
Yes. Export your spreadsheet as CSV (File → Download → CSV in Google Sheets, or Save As → CSV in Excel), then paste the contents into the tool. The comparison works with any standard CSV format.
Yes. If the 'First row is header' option is enabled, the tool treats the first row as column names and uses them to align and label the comparison. This makes it easy to see which columns changed.