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CSV Duplicate Row Finder

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Find duplicate rows in CSV or TSV data by comparing the whole row or a chosen set of key columns, and see exactly which data rows each duplicate group appears at.

Paste CSV or TSV data and this groups rows that share the same value, either across every column or just the key columns you pick, so you can spot accidental duplicates before importing a spreadsheet export into a database or spreadsheet tool. It reports each duplicate group's value, how many times it occurs, and exactly which data rows it appears at, so cleanup is a matter of jumping to those rows rather than eyeballing the whole file. Comparison is case-sensitive and whitespace-trimming by default, both configurable, and it never mutates or writes anything, it only reports what it finds.

csvduplicatesdata-cleaningdedupetsv

How to use CSV Duplicate Row Finder

  • 1.Paste CSV or TSV data with a header row (or turn off the header toggle if your data has none).
  • 2.Optionally list specific key columns to compare, comma-separated; leave it blank to compare the entire row.
  • 3.Review the duplicate groups, each showing its value, occurrence count, and which data rows it appears at.

Frequently asked questions

Does row numbering include the header row?
No, row numbers count data rows only starting at 1; the header row, if present, is never counted.
Can I check duplicates on just one or two columns instead of the whole row?
Yes, list the column names you want to compare (comma-separated); rows are grouped by those columns' values only, ignoring the rest.
Is comparison case-sensitive?
By default yes, and whitespace is trimmed before comparing. Both are toggles if you need exact-whitespace or case-insensitive matching instead.
Does it remove the duplicates for me?
No, it only finds and reports them. You still decide which rows to keep or delete yourself.

Use via API, SDK, or MCP

cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/csv-duplicate-row-finder \
  -H "Authorization: Bearer utx_live_..." \
  -H "Content-Type: application/json" \
  -d '{"csv":"name,email\nAlice,alice@x.com\nBob,bob@x.com\nAlice,alice@x.com","delimiter":",","keyColumns":[]}'

Get an API key from your dashboard · Full API docs →

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