Merge
PRO
Spreadsheet merge

Many files in.
One clean stack out.

Combine CSV, TSV, and Excel files without hand-matching columns. SheetSweep lines up matching headers, keeps every extra column, and stacks all rows into one file.

Merged in your browser
Headers aligned automatically
CSV or Excel output
Build a merged file2+ files · 4 MB each

Choose files to stack

Add at least two CSV, TSV, XLSX, or XLS files. Nothing leaves this page while they’re being merged.

Tip: drag & drop files right onto the panel · add at least two

Pro tool preview · files up to 4 MB each
Private by design — your files never leave this browser tab.
By merging files you agree to our .

How a merge works

Three steps, all in your browser. Nothing ever uploads.

1Drop your filesAt least two — CSV, TSV, XLSX, or XLS, up to 4 MB each.
2Columns line up themselvesMatching headers stack into the same column. Extra columns are kept, never dropped.
3Download one fileEvery row is tagged with its source file, so you always know where data came from.
0files ready
0projected rows
0output columns
Track where every row came fromAdd the originating filename to each merged row.

Add at least two files to see how their columns will line up.

Your merged file is ready

0 rows · 0 columns