Runs locally in your browser
Visually highlight every repeated line in place and show how many times each duplicated value occurs.
About this tool
Deleting duplicates immediately can hide useful context. Highlighting lets you audit where repeated values occur while preserving the original row order.
Duplicate rows receive a visible warning style and count badge; copied output contains a compact count table.
FAQ
Yes. The visual result keeps every row so duplicates can be reviewed in context.
The copied result contains one line per duplicated value with its count.
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Guides
Compare two spreadsheet columns, identify missing values, handle duplicates and blanks, and validate the result safely in Excel or Google Sheets.
Read guide →Learn decision-focused methods to remove duplicate lines while keeping first or last occurrence. Compare command-line, spreadsheet, and browser-local tools.
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