Duplicate Line Remover
Strip duplicate lines from pasted text and keep only the unique ones.
This free online duplicate line remover cleans up lists, email addresses, log files, and CSV exports by removing repeated lines. Choose case-sensitive or case-insensitive matching, decide whether to keep the first or last occurrence, and optionally ignore leading/trailing whitespace. No signup required, runs entirely in your browser.
Case-sensitive
When off, "Apple" and "apple" are treated as the same line.
Keep occurrence
Trim whitespace before comparing
Ignores leading/trailing spaces when comparing lines (the original spacing is still kept in the output).
How to remove duplicate lines from text
Paste text into the input box above. The tool keeps a single copy of every unique line — based on the options you choose — and removes the rest, updating the result instantly. Toggle Case-sensitive to control whether "Apple" and "apple" count as duplicates, pick whether to keep the first or last occurrence of each repeated line, and turn on Trim whitespace to ignore stray leading or trailing spaces when comparing.
When you need to dedupe lines
Duplicate lines show up constantly in real work: email lists collected from multiple sign-up forms, log files where the same error repeats on every request, CSV exports merged from several sources, or a list of URLs scraped from more than one page. Removing the duplicates before importing the data into a spreadsheet, mailing tool, or database keeps counts accurate and avoids sending the same message twice.
