How to cell-by-cell comparison of two excel files with change highlighting
- Step 1Upload File A and File B — Drop the two Excel file versions to compare — File A is the 'before' and File B is the 'after'.
- Step 2Run the diff — Every cell in every sheet is compared. Changed, added, and removed values are flagged.
- Step 3Download the diff report — Save the colour-coded XLSX and read the text summary showing every cell change.
Frequently asked questions
Does it compare formatting as well as values?+
Values and text only — formatting changes (fonts, colours, borders) are not diffed in the current version.
What happens with sheets that exist in one file but not the other?+
Sheets present in only one file are shown in full with all cells marked as added or removed accordingly.
Can it handle very large files?+
Pro tier allows 50 MB per file. Files with 100,000+ rows may take several seconds to compare in the browser.
Privacy first
Every JAD Excel tool runs entirely in your browser using SheetJS and ExcelJS. Your spreadsheets, formulas, and data never leave your device — verified by zero outbound network requests during processing.