Online CSV Merge
CSV MergeHeader DedupMerge TablesCSV
Merge multiple CSVs with header deduplication and column alignment. Handles differing headers as union, quoted commas, empty line filtering, local processing.
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How to Use
- Paste the source data into the left panel
- Confirm the target format and click Convert
- Copy or download the result from the right panel
- All processing runs locally in your browser; your code is never uploaded
Related Tools
FAQ
How to merge multiple CSVs?
Paste each CSV (first row as header) into separate inputs and click Merge; headers union and columns aligned.
What if headers differ?
Headers become union in first-appearance order; missing fields are empty.
How are commas/quotes handled?
Per CSV spec, quoted commas not split; output quotes fields with comma/quote and escapes "" .
Will my data be uploaded?
No, merging runs locally.