Find Duplicate Lines
See which lines repeat in any list or text — with exact counts, privately in your browser.
Result
Before cleaning up a mailing list, keyword set, log file, or exported spreadsheet column, it often pays to know what exactly repeats — and how many times. Deleting duplicates blindly hides that information; this tool surfaces it instead.
Paste your text and get an instant report: how many distinct lines are duplicated, plus each repeated line with its occurrence count, sorted from the most frequent down. Your original text is never modified, and nothing is uploaded — the analysis runs entirely in your browser, so confidential lists stay on your device.
Matching is flexible: enable case-insensitive comparison so "Apple" and "apple" count as the same line, and whitespace trimming so indented or padded copies are caught as well. The first occurrence of each line is shown in its original spelling, so the report stays readable.
Need the full picture? Switch the output mode to list every distinct line with its count in original order — handy for frequency audits, log triage, and spotting near-duplicates before you decide what to keep.