Excel Diff · Two-Sheet Compare
Drag two XLSX or CSV files to get a cell-by-cell diff with color-coded add / remove / modify. 100% browser-side — nothing uploaded.
🔒 Files never leave your browser — processed fully client-side
Choose file
XLSX · XLS · CSV · TSV supported. Click or drag & drop.
Choose file
XLSX · XLS · CSV · TSV supported. Click or drag & drop.
First row is treated as the header. Duplicate keys are matched in order of appearance.
Merged cells are represented by their top-left value.
Pick both files, choose sheet and key column, then press "Run compare".
Notice: All processing is in-browser; files are never uploaded. Very large files (100k+ rows) may slow down depending on your device.