Compare Excel Files Privately — No Uploads, Processed Locally
Drop two Excel workbooks to securely generate a 100% private Diff Report showing changed cell values and added/removed sheets without your data ever leaving your computer. Note: comparisons are by cell address — inserted or deleted rows are not detected as structural moves.
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Your files never leave your computer — guaranteed.
This tool runs 100% inside your browser. Both workbooks are loaded directly into your device's memory (RAM) using JavaScript. No data is transmitted to any server, at any point. Not even a filename. You can disconnect from the internet entirely and this tool will still work.
Important: understand what this tool does and does not do
This tool executes a direct cell-by-cell comparison using each cell's address (e.g. A1, B3) as the unique key. It works best when both workbooks share the exact same column and row structure. It does not natively handle dynamically inserted or deleted rows and columns — if a row was inserted in File B, every cell below it will appear as "changed" even if the actual data is the same.
Original File (Base)
The "before" workbook
Drop .xlsx / .xlsm here, or click
Modified File (To Compare)
The "after" workbook
Drop .xlsx / .xlsm here, or click
How it works
What gets reported?
- Cell values that differ between File A and File B (including cells that went from empty to a value, or vice versa)
- Sheets present in File B but not in File A (added sheets)
- Sheets present in File A but not in File B (removed sheets)
What is NOT reported?
- Inserted or deleted rows/columns — the tool compares by cell address, not row position
- Formatting changes (colours, fonts, borders)
- Formula changes where the computed value is identical
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