Merge CSV Files
Merge multiple CSV files into one result with strict and loose schema handling modes.
CSV to ExcelExcel to CSVCSV to JSONJSON to CSVMarkdown TableCSV DeduplicateRemove Empty RowsTransposeSort by ColumnSelect ColumnsSplit CSVMerge CSV
Upload Files
Upload multiple files. Processing stays in the browser.
Active input: -
Paste Input
Paste CSV, JSON, or Markdown table content directly.
Settings
Result Preview
Load data first and generate a result. The preview will appear here.
How to use
Upload multiple CSV files and optionally add a pasted CSV block as extra input.
Choose strict or loose merge mode.
Review the merged result and download the combined CSV.
Best for
Combine multiple order or contact exports into one file.
Aggregate CSV files maintained by different teams.
Use loose mode first when schemas do not match exactly.
FAQ
What does strict mode validate?
Strict mode requires every CSV to have the exact same headers in the same order.
How does loose mode handle missing columns?
Loose mode fills missing columns with empty values.
Are headers duplicated in the merged output?
No. The merged result keeps only a single header row.