Drop two or more CSV files, get one merged file. Columns are matched by header name, so files with different column orders still line up. Everything runs in your browser; your data is never uploaded.
or click to choose 2 or more files
No. The merge runs entirely in your browser with JavaScript. Your files never leave your computer.
Columns are matched by header name, not position. The result has the union of all columns, and cells are left empty where a file does not have that column.
With the option on, a row is dropped only if every value is identical to an earlier row in the merged result. Near-duplicates such as different spacing or capitalisation are not removed.
This tool handles CSV files only and assumes the first row of each file is a header. For Excel workbooks, mismatched headers, bad encodings or a merge you need every week, Sheetsmith will do it for you and deliver in 24 hours.
Fixed price before any work starts. Row counts reconciled so nothing goes missing.
See pricing Merge Excel files service