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# Spreadsheet duplicate finder

Find duplicate and near-duplicate rows in an XLSX or CSV using chosen key columns, normalisation rules, and a fuzzy threshold, then review clusters and export a clean file.

Load rows, tick the key columns, then run the scan. Clusters come back with per-column scores before anything is removed.

How matching works: after normalising the ticked columns, two rows are a duplicate pair only when every key column reaches the threshold. Blank key cells score zero, so a row with a blank key never matches anything. Candidate pairs are found by blocking on each column's first character and length band, which keeps the run fast but means two rows whose key text starts with a different character in every key column are never compared. The cleaned file re-joins the kept rows with standard CSV quoting, so cell values survive but number formats and styles from an Excel file do not. Nothing is removed until you download, nothing is uploaded, and the cluster report lists every cluster with its scores.
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## More PDF & file tools

- [Excel sheets (XLSX)](/files/xlsx)
- [Word documents (DOCX)](/files/docx)
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