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Home/Tools/File Tools/CSV Merge & Join Tool

CSV Merge & Join Tool

Merge multiple CSV files online. Combine CSV files by stacking rows or joining on a common column key. Browser-based — files never sent to servers.

Your data never leaves your browser

Related

CSV Viewer & Analyzer

View CSV files as a sortable, searchable table

JSON ↔ CSV Converter

Convert between JSON arrays and CSV files online

Excel File Viewer

View Excel XLSX files in your browser

Frequently Asked Questions

What merge modes are available?

Stack (append rows from all files, assuming same headers) or Join (merge on a matching column key, like SQL JOIN).