Drop two Excel or CSV files to compare side-by-side. All processing happens in your browser — no data is uploaded anywhere.
File A No file selected
Load a file or paste data to begin
Click ☆ to mark a column as KEY (row identity).
Click — on the left to mark a row as HDR (header).
File B No file selected
Load a file or paste data to begin
Click ☆ to mark a column as KEY (row identity).
Click — on the left to mark a row as HDR (header).
Load both files above, then click Compare (or press Ctrl+Enter)