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Combine multiple CSV files into one. Auto-matches columns by header name — handles different schemas gracefully. 100% private.
Merge multiple CSV files into one online — no signup, no upload, no limits. Drop your CSV files, and the tool combines all rows into a single output. Columns are matched by header name, so files with different schemas merge cleanly — missing columns get empty values. Everything runs locally in your browser using a client-side spreadsheet engine. Your data never leaves your device.
Drop or select multiple CSV files at once. The tool reads all files, matches columns by header names, and combines all rows into a single CSV. If files have different columns, the merged output includes all columns with empty cells where a file didn't have that column.
The tool handles mismatched schemas gracefully. It creates a union of all columns across all files. Rows from files missing a column get an empty value for that column.
No hard limit on the number of files. You can merge dozens of CSVs at once. The practical limit depends on your browser's memory.
This tool is optimized for CSV files. To merge Excel files, first convert them to CSV using our Excel to CSV tool, then merge the CSVs here.