Remove Duplicate Lines Online
Input
Output
Text Tools
Paste any text into the input box and duplicate lines are removed instantly as you type. The output shows only unique lines with a count of how many duplicates were eliminated. All options update the result in real time — no button to press.
A duplicate line remover scans a block of text line by line and removes any line that has appeared before. It is useful for cleaning lists, deduplicating data exports, consolidating keyword lists, removing repeated log entries, and tidying up any multi-line text where repetition should be eliminated.
Paste your text into the left panel. The right panel instantly shows the deduplicated result. Use the options to control whether matching is case-sensitive, whether leading and trailing whitespace is ignored before comparing, and whether to keep the first or last copy of a repeated line. Optionally remove all blank lines too.
Writers and editors use it to clean up keyword lists and tag sets. Developers and data analysts use it to deduplicate CSV rows, log files, and code output. SEO professionals use it to remove duplicate anchor texts or URL lists. Anyone managing lists in spreadsheets, Markdown, or plain text will find it instantly useful.