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.
CSV Input (2)
CSV 1
CSV 2
Merged Result
All processing is done locally, no upload
How to Use
- Paste any valid JSON, supports nesting, arrays and escapes
- Click Beautify to auto indent and format
- Click Minify to remove whitespace into one line
- All operations run locally for privacy
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.