Merge Spreadsheets
Stack several Excel or CSV files into one clean table — no formulas required. Free, private, and right in your browser.
Drop Excel or CSV files here, or browse
.xlsx, .xls, .csv · stacked into one sheet on your device, never uploaded
Output
Reads the first sheet of each file and stacks the rows into one table, matching columns by their header names. Everything runs on your device.
How to merge spreadsheets
- Drop your Excel or CSV files into the box above.
- Choose whether to add a “Source File” column and pick the output format.
- Click Merge — the combined file downloads automatically.
Frequently asked questions
- Is my data uploaded to a server?
- No. The files are read and merged entirely inside your browser, so your spreadsheets never leave your device.
- How are columns matched?
- Rows are matched by their header (column) names. If files share the same headers, they stack cleanly; any extra columns from a file are added to the combined sheet too.
- Can I mix Excel and CSV files?
- Yes. You can drop a mix of .xlsx, .xls and .csv files and they'll all be combined into one sheet.
- Can I tell which file each row came from?
- Yes — keep the “Source File” column option on and the merged sheet will include the original filename for every row.