Spreadsheet merger
Merge Excel & CSV Files Online
Merge Excel files online without copying rows between workbooks. SheetSweep lines up columns with matching headers, keeps extra columns that appear in only one file, and stacks every row into a single spreadsheet.
Use the same workflow to combine CSV files, TSV files, or a mix of supported spreadsheet formats. A source-file column can tag each merged row, which makes the final data easier to audit.
Download the merged result as CSV or Excel. The tool works in your browser, so even multi-file jobs stay on your device.
Open the MergerPrivate by design. Your files never leave this browser tab — no uploads, no servers, no signup. What happens in your spreadsheet stays in your spreadsheet.
1Add two or more filesChoose CSV, TSV, XLSX, or XLS files that you want to stack.
2Check the column alignmentMatching headers share a column while unmatched headers remain in the output.
3Download one spreadsheetSave the merged rows as CSV or Excel, with source filenames if you want them.