Free CSV tool · runs in your browser

Merge CSV files online

Combine multiple spreadsheets into one file. Headers are matched by name. Nothing is uploaded to a server.

  1. 01Upload files

    Drop two or more CSV files. Drag a row to change merge order.

  2. 02Merge & download

    Review any warnings, then download the combined CSV instantly.

Drag & drop CSV files

or click to browse · .csv only

What this tool does

  • 01
    CSV only. Merge several comma-separated files in one pass.
  • 02
    Smart headers. Columns line up by name even when order differs.
  • 03
    Private by default. Files stay in your browser and never leave the device.
  • 04
    Clear errors. Empty files, header clashes, and missing rows are flagged before you download.