Merge CSV Files, free in your browser

Combine two or more CSV or TSV files into one. Matching headers are aligned even when the columns appear in a different order.

How to merge CSV files

1. Choose at least two CSV or TSV files.
2. Reorder files if needed and confirm the header option.
3. Merge and download the combined CSV.

Limits & good to know

• Each file may be up to 50 MB and the combined total up to 200 MB.
• Header names match without regard to case or surrounding spaces. Duplicate headers in one file must be renamed first.

Frequently asked questions

Are my files uploaded to a server?

Your files are processed on your device, not uploaded to our servers. Your file and edits are saved in this browser for recovery, and previous documents remain in Saved drafts when you open another file. Use Saved drafts to resume or delete individual copies, or clear this site’s browser data to remove all copies. Browser storage can be cleared or become unavailable; download important work.

What happens when a file is missing a column?

The merged result leaves that file’s cells blank for the missing column.

Is this really free, or free "until you hit a limit"?

Really free. Unlike most "free" PDF sites there is no task-per-day cap, no locked Pro features, no watermark stamped on your file, and no payment step before download. Every tool is the full tool.