Compare two Excel files, cell by cell
To compare two Excel workbooks, drop both files into Diffesq: it lines up the sheets and shows exactly which cells changed, were added, or were removed — all in your browser.
Spreadsheets often carry the numbers you least want on someone else's server. Diffesq never uploads them: the workbook comparison runs locally on your device.
How it works
- Open the Diffesq workbench and drop a workbook on each side.
- Diffesq parses both workbooks locally and aligns their sheets.
- Review changed cells in a grid view, sheet by sheet, with changes tinted and a summary count across the workbook.
- Export a report (HTML, Markdown, JSON, PDF) generated on your device.
What the comparison covers
- Cell-level differences across every sheet in the workbook.
- Added, removed, and modified cells are tinted distinctly and summarized.
- A virtualized grid keeps large sheets scrollable and responsive.
Free vs Pro
Structured-file comparisons run in full on your device on the free tier, with about a third of the results shown as a preview; Pro unlocks the complete results and clean, unwatermarked exports (HTML, Markdown, JSON, PDF).
See Pricing for plans — $2.97/month, $27.99/year, or $49 once.
Privacy
Every comparison runs locally in your browser. Your files are never uploaded — there is no server that receives them, and the page keeps working with Wi-Fi turned off. Details in the Privacy Policy.
Frequently asked questions
Can it compare CSV exports too?
Yes — CSV files get the same cell-by-cell treatment. See Compare CSV files.
Is my spreadsheet uploaded?
No. The workbook is parsed and compared entirely in your browser.
Does it work offline?
Yes — once the page has loaded, parsing, comparing, and rendering all happen on your device. Turn off Wi-Fi and it still works.
Do I need an account?
No. Comparisons run without any signup. Pro features unlock with a license key — still no account or login.