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Free spreadsheet tool

Spreadsheet Duplicate Finder

Find repeated spreadsheet records using selected columns, then download unique rows and duplicate rows separately.

Files stay on your deviceCSV, TSV or XLSX ยท Up to 10 MB per file
Try a sample first

Explore the tool with example spreadsheet data before using your own file.

Columns that define a duplicateChoose a file first.

Limits: 50,000 data rows and 500,000 cells per result. Excel files: one selected worksheet per file. Only table values are exported.

How to use this tool

  1. Choose your file and worksheet. Every column needs a unique heading.
  2. Select the columns that define a duplicate, such as product ID or a combination of name and postcode.
  3. Review the counts. The first matching record is kept; later matches appear in the duplicate download.

What to check

Matching is exact and case-sensitive. Similar names, spelling differences and changed whitespace are not treated as duplicates. Review the selected columns before removing records.

Does this tool upload my files?

No. Processing happens in your browser. The tool does not send spreadsheet contents to Tech Tycoon or to an AI service. Your original file is unchanged.