Two or more similarly structured CSV or TSV files
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CSV Merger
Combine multiple CSV or TSV files and align columns by their headers.
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No uploadsYour files stay on this device.
Local engineYour browser does the work.
Auto cleanupTemporary memory is released.
About this tool
Use csv merger without uploading files
Append compatible CSV or TSV files into one table while handling their shared header row locally.
Processing takes place in your browser tab. Temporary working data is released when you leave or reload the page.
Three steps
- Choose the tables you want to combine.
- Confirm the delimiter and header behavior.
- Merge the rows, inspect the preview, and download the result.
Useful for
Common merge csv tasks
- Combining monthly exports
- Joining survey batches
- Consolidating report files
Practical details
What to know before you start
One combined delimited table
- Column order should match across source files.
- This appends rows; use CSV Key Join to combine columns by an identifier.
- Check for repeated headers and duplicate records after merging.