Runs locally in your browser
Find values that occur more than once and output each duplicated value once in its first-seen order.
About this tool
Sometimes the duplicated values are the result you need—for example when checking repeated IDs, overlapping responses, or accidental reimports.
This extractor returns one copy of each value whose frequency is greater than one.
FAQ
No. Each duplicated value appears once, regardless of how many times it occurred.
Use the frequency counter or duplicate highlighting tool for counts.
Related tools
Guides
Compare two spreadsheet columns, identify missing values, handle duplicates and blanks, and validate the result safely in Excel or Google Sheets.
Read guide →Learn decision-focused methods to remove duplicate lines while keeping first or last occurrence. Compare command-line, spreadsheet, and browser-local tools.
Read guide →