Free Online Excel Diff & Compare
Compare two versions of an Excel or CSV file. Highlight added rows in green, deleted rows in red, and cell-level modifications in yellow. Align sheets instantly using unique key columns or sequential indexes.
How Excel Compare Works
Spot values changes, row insertions, and deletions in 3 simple steps.
Upload Version A & B
Upload the original spreadsheet (File A) and the modified version (File B). Files are processed locally.
Set Key Identifier
Choose a column (e.g. ID, SKU, Email) to align rows correctly. Fallback to row-by-row index matchup if needed.
Inspect Diff & Export
Audit highlighted cells on the grid, view tooltips with old values, browse the audit Change Log, and download the Excel delta report.
Download Test Datasets
Download both historical and updated spreadsheet files to try the aligned differences engine.
Visual Budget Reconciliation
Download both versions to test cell changes and row additions in cost forecasts.
HR Employee Payroll Roster
Audit employee list changes, salary modifications, and terminations side-by-side.
Product Inventory Reconciliation
Download both versions to reconcile SKU quantities, highlight modified prices, and detect missing stock.
Why use our Excel Comparator?
Manually highlighting differences between spreadsheets is tedious and error-prone. Our tool makes it fast and completely private.
100% Browser-Based Security
Spreadsheets are parsed locally using JavaScript. Your confidential account sheets or payroll rosters are never sent to external servers.
Auto-Row Alignment Mechanics
Aligns rows using a custom key column index to prevent rows from throwing off mismatches when items are added or deleted.
Detailed Cell-Level highlights
Highlights additions in green, deletions in red, and cell-level changes in yellow, displaying hover tooltips of original values.
Frequently Asked Questions
Answers to popular questions about client-side Excel comparing.
Q.How does the row alignment engine work?
It scans a selected key column (like ID or SKU) to pair rows between original A and modified B sheets. If records are inserted or deleted, it preserves row pairings instead of misaligning all remaining cells.
Q.Are my spreadsheets uploaded to servers?
No. The entire comparison is done locally within your browser using JavaScript memory. Your company financials or employee logs never leave your device.
Q.Can I export the highlight differences?
Yes. You can click "Download Diff Report" to export a new Excel workbook containing a structured Audit Log sheet and a formatted comparison delta sheet.
Q.What formats are supported?
The tool supports standard Microsoft Excel workbooks (.xlsx, .xls) and comma-separated raw tables (.csv) files.