# Fuzzy Duplicate Finder for Spreadsheets

> Source: <https://cleanmysheet.in/use/fuzzy-duplicate-finder>
> Published: 2026-09-11 17:17:51.300499+00:00

CleanMySheet guide

# Find near-duplicate rows (fuzzy matching)

CleanMySheet groups similar rows using normalized Levenshtein similarity (default ~85%) after blocking on a short key prefix so large files stay usable. Matches appear in a review drawer; nothing is removed until you mark a pair as a duplicate.

Near-duplicates wait for your review.

Drop CSV or Excel here

Tap to choose a file. Parsing stays on this device.

Parsing stays on this device. Optional: drop a .cleanmysheet.json recipe with it.

[Open the cleaner](/clean?op=fuzzy)

## Steps

1. Run a scan after upload
2. Add Fuzzy duplicate detection from search or Recommended
3. Open Review fuzzy pairs
4. Mark Duplicate or Keep both
5. Undo anytime

## Not an LLM guess

Similarity is a string distance, not a model hallucination. You can undo the whole step from the recipe list.

## Related searches this page answers

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