Free Excel Diff Checker
Paste or upload two CSV files and instantly see every row that was added, removed, or changed.
How to use Excel Diff Checker
Paste or upload two CSV files and instantly see every row that was added, removed, or changed.
Frequently asked questions
What types of differences does it detect?
It detects added rows (in file B but not A), removed rows (in A but not B), and modified rows (same row key but different values).
Does it compare by row position or by key column?
By default it compares row-by-row. You can also select a key column (like an ID) to match rows across files even if their positions differ.
Is my data uploaded?
No. Comparison happens entirely in your browser.
Can I compare XLSX files?
Yes. Upload .xlsx or .csv files. The tool reads the first sheet of Excel files.
Is there a row limit?
No hard limit. Files with tens of thousands of rows work well; very large files may take a few seconds.
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