Compare Excel & CSV files online
Spot every change in seconds. Upload two files and the diff appears automatically, side by side, with changed cells, added rows and removed rows highlighted. Your files stay in your browser.
- 100% free forever
- Private, in your browser
- Instant results
File A (original)
Click to upload or drag and drop
Excel (.xlsx) or CSV files
File B (new)
Click to upload or drag and drop
Excel (.xlsx) or CSV files
How do I compare two Excel files?
Upload both files and the diff appears automatically, no button to press. Pick a key column, like an ID or email, so rows line up even when they are sorted differently. DataSort highlights every changed cell, added row and removed row, and you can export just the differences. It runs in your browser and is free with an account at five comparisons every twenty minutes.
- 1Drop File A (the original) into the first box above.
- 2Drop File B (the new version) into the second box. The comparison runs on its own.
- 3Choose a key column so rows pair up even when sorted differently, or leave it on row order.
- 4Switch between Compare files, Reconcile and Compare columns for the view you need.
- 5Export the differences to Excel. Your original files are never changed.
Everything the comparison shows you
Changed cells, highlighted
Every cell whose value differs between the two files is highlighted on both sides, so a single edited number never slips past you.
Added and removed rows
Rows that exist in only one file are colour coded as added or removed, with gap markers on the other side so the two stay aligned.
Match by a key column
Pair rows by an ID, email or any column instead of by position, so a re-sorted or re-ordered file still lines up correctly.
Reconcile records
Match by a key and check a value column: see full matches, value mismatches, and keys that exist on only one side. Built for audits.
Compare columns as sets
Compare two lists and see which values appear in both, and which are only on the left or only on the right. No row by row noise.
Private and free
Files are read in your browser with SheetJS and never uploaded. Free with an account at five comparisons every twenty minutes, unlimited on any paid plan.
Teach others how to clean Excel files and get paid.
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Common questions about comparing files
How do I compare two Excel files?
Are my files uploaded to a server?
Is comparing files free?
Can I match rows that are in a different order?
How It Works: Technical Methodology
Deterministic, local diff
Comparisons are computed in your browser, not by an AI model. Rows are matched by a key column or by position and compared cell by cell, so the result is exact and repeatable every time.
Privacy & processing
A stateless architecture: files are parsed locally with SheetJS and never stored on our servers. The only thing the server does is count your free comparisons so the limit is fair.