Question 1

How do I merge multiple CSV files into one?

Accepted Answer

Upload two or more CSV files and the tool combines them into a single file. If all files share the same columns, rows are stacked vertically. If columns differ, the tool aligns matching columns and adds new ones as needed.

Question 2

Do the CSV files need to have the same columns?

Accepted Answer

No. The merger handles files with different columns by creating a unified header with all columns from all files. Rows from files missing certain columns will have empty values in those fields.

Question 3

Will duplicate headers cause problems?

Accepted Answer

No. When merging files with the same headers, only one header row is kept in the output. The tool matches columns by name, so even if column order differs between files, data is aligned correctly.

Question 4

Is there a limit on how many files I can merge?

Accepted Answer

There's no hard limit on file count. You can merge dozens of files at once. The practical limit is your browser's memory, which depends on total combined file size. Merging stays fast for typical datasets.

CSV Merger

Upload Files to Merge

Frequently Asked Questions

Then send the result straight to Google Sheets