CSV Merger
Combine multiple CSV files or text blocks into a single CSV. Handles different column sets and optionally removes duplicates.
Merged CSV
About CSV Merger
The CSV Merger stacks multiple CSV files vertically into one. It automatically handles CSV files with different column sets by using the union of all columns and filling missing values with empty cells. Each source file's header row is used once in the output.
How It Works
- Add two or more CSV sources (paste text or upload files).
- Choose the delimiter used in your CSVs.
- Optionally enable "Remove duplicate rows" to deduplicate the output.
- Click "Merge CSVs" to combine them into one file.
FAQ
The merged output uses all unique column names across all source files. Rows from a file that doesn't have a given column will have an empty value for that column.
Yes — two rows are considered duplicates only if every cell value matches exactly (case-sensitive).
No. Everything happens in your browser. Your data never leaves your device.