Line dedupe
Remove Duplicate Lines Online
Remove extra line occurrences, find and count repeated lines, or keep once-only lines. Newline-separated input preserves retained order unless you choose sorting.
Paste/type up to 300 KB · local text files up to 10 MB per file and batch · CSV is plain text
Line dedupe
Remove, find, and count with one line parse
Newline is the default delimiter
Each line is treated as one item, so the output remains easy to scan and copy back into editors, terminals, spreadsheets, or documents.
Preserve order and keep first or last
The result keeps retained lines in input order by default. Keep first preserves the first matching line; Keep last retains the final spelling or formatting and its position.
Switch between Result, Repeated, and Once only
Result removes extra occurrences, Repeated lists values that occur at least twice, and Once only keeps lines seen exactly once. Copy with counts adds each returned line's occurrence count.
A line-by-line remove, find, or count workflow
Paste lines
Each newline is treated as one item, matching the most common duplicate-line workflow.
Choose the result view
Use Result to remove extras, Repeated to find duplicate lines, or Once only to isolate lines that occur once.
Review counts and retention
Check total, distinct, repeated, once-only, and removed counts, then keep the first or last occurrence before copying or downloading.
Remove duplicate lines FAQ
Can I find and count duplicate lines instead of removing them?
Yes. Use the Find duplicates preset or switch Show to Repeated. The preview shows occurrence counts, and Copy with counts creates a counted report.
Will the result preserve line order?
Yes. Order is preserved by default. Sorting changes that order only when you enable it, and Keep first or Keep last controls which matching line is retained.
Can blank lines be removed too?
Yes. Turn on Remove empty lines in the visible cleanup options.
Duplicate-removal workflows
Related duplicate-removal workflows
Each route uses the local processing engine with defaults and guidance for one clearly defined task.
Text and list dedupe
Duplicate Remover Online for Text & Lists
Choose matching, keep, sorting, and result-view rules for mixed text or list input.
List dedupe
Remove Duplicates From a List Online
Split one list by comma, tab, or another delimiter and keep stable item order.
TXT and local text files
Remove Duplicates From TXT Files
Start with local TXT or plain-text files, process them in the browser, and download the result.