BlueprintLab Tools
JAEN
All tools / CSV · Duplicates

FREE WEB TOOL

CSV duplicate finder

Find duplicate values and row numbers in a selected column.

Find duplicates

Files are processed in your browser and are not sent to our server.

About this tool

CSV duplicate finder is a free online utility from BlueprintLab Tools. Find duplicate values and row numbers in a selected column.

Use it when you need to inspect, compare, clean, or transform CSV and structured data quickly.

No account is required. The tool is designed to complete the task directly in your browser with a short input → process → result flow.

How to use

  1. Enter or choose ＋ choose csv.
  2. Enter or choose column.
  3. Run the tool and review, copy, or use the result.

Related tools

CSV row splitterSplit a large CSV into files with a chosen number of rows.CSV mergerMerge multiple CSV files with matching headers.CSV mojibake & character risk checkerFind emoji and special characters that often cause problems in Shift_JIS-based imports.CSS clamp() generatorGenerate a fluid CSS clamp() expression from viewport and size ranges.