Excel Diff Viewer
Compare two Excel workbooks (.xlsx, .csv) cell-by-cell and row-by-row.
Original File (Base)
Modified File (Target)
Excel Diff Viewer helps you compare two Excel workbooks (.xlsx, .xls, .csv, .tsv) or pasted table data cell-by-cell and row-by-row.
Easily select and compare any sheet within multi-sheet workbooks. Modified cells (yellow), added rows (green), and removed rows (red) are visually highlighted so you can pinpoint differences instantly. All calculations run strictly inside your browser for complete data privacy.
How to use
- Upload or drag & drop the Original and Modified Excel files.
- Select the worksheet you want to compare if the workbook contains multiple sheets.
- Toggle options such as treating the 1st row as headers or matching rows by a key column.
- Inspect the diff table with highlighted changes (Yellow: Modified cell, Green: Added row, Red: Removed row).
- Use the 'Differences Only' filter to focus strictly on changed rows.
FAQ
- Are uploaded Excel files sent to any server?
- No! File parsing and comparison are executed 100% locally in your web browser. No file or cell data is ever sent to an external server.
- Which file formats are supported?
- Supports .xlsx, .xls, .csv, and .tsv formats, as well as direct text pasting of table data copied from Excel.
- Can I compare workbooks with multiple worksheets?
- Yes, all sheets in the uploaded workbooks are detected, allowing you to select and compare matching sheets.
- Can it handle large Excel files?
- Yes, files with tens of thousands of rows can be parsed and compared instantly using browser-native processing.