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[ARTICLE · art-127073] src=cleanmysheet.in ↗ pub= topic=ai-tools verified=true sentiment=· neutral

Fuzzy Duplicate Finder for Spreadsheets

CleanMySheet released a fuzzy duplicate finder that groups near-duplicate spreadsheet rows using normalized Levenshtein similarity at a default threshold of about 85%, blocking on a short key prefix to keep large files usable. The tool parses CSV and Excel files on the user's device, surfaces matches in a review drawer, and removes nothing until a user marks a pair as a duplicate, with an undo option available from the recipe list. CleanMySheet states the similarity measure is a string distance rather than an LLM guess.

read1 min views1 publishedSep 11, 2026

CleanMySheet guide

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

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 #

  • fuzzy duplicate finder
  • near duplicate rows
  • similar contacts csv
source & further reading
cleanmysheet.in — original article Spreadsheet Cleaner vs ChatGPT Clean CSV Online (Free, In-Browser) Show HN: CleanMySheet – Privacy-first CSV/Excel cleaner that runs in the browser
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