Remove Duplicate Lines
Paste a list to remove duplicate lines and keep only the unique ones. The first occurrence of each line is kept in its original order, so your list stays intact — it all happens instantly in your browser, nothing uploaded.
Keep only unique lines, in order
Deduplicating a list by hand is tedious and error-prone. This tool scans your text line by line, keeps the first time each distinct line appears, and drops every later repeat — so a messy export becomes a clean set of unique lines without losing the order you pasted them in. That order-preserving behaviour is what sets it apart from tools that sort first and dedupe as a side effect.
Case, whitespace, and blank lines
Real lists are rarely perfectly clean. Turn on Ignore case when capitalisation differences shouldn't count as different lines, and Trim spaces so stray leading or trailing whitespace doesn't hide a duplicate. Remove empty lines clears the blank gaps that often come from copying out of a document or spreadsheet.
Private and instant
Everything runs on your device — there is no upload and nothing is stored, so it is safe for email lists, log files, or any private data. Need to reorder or combine steps? The sort text tool can sort and remove duplicates together, and the word counter tells you how much text you have left afterwards.
Frequently asked questions
How do I remove duplicate lines from text?
Paste your text into the box and the duplicates are removed as you type, leaving one copy of each line. The first time a line appears is the copy that is kept, so the original order of your list is preserved rather than shuffled.
Does it keep the original order of the lines?
Yes. Unlike sorting-based dedupers, this tool keeps your lines in their original order and simply drops later repeats. If you would rather have the result sorted as well, use our sort-text tool, which can sort and remove duplicates in one step.
What do the ignore-case and trim options do?
Ignore case treats "Apple" and "apple" as the same line so only one is kept. Trim surrounding spaces ignores leading and trailing whitespace when comparing, so " apple" and "apple" count as duplicates. Both change only how lines are compared — the kept line keeps its original text.
Can it also remove blank lines?
Yes — enable "Remove empty lines" to strip out blank or whitespace-only lines entirely, which is handy when cleaning up a list pasted from a document or spreadsheet that has gaps between entries.
Is there a limit on how much text I can paste?
It comfortably handles very large lists — tens of thousands of lines — because the deduplication runs instantly in your browser with no upload. Extremely large inputs depend on your device memory, but for typical logs, email lists, and keyword lists there is no practical limit.
Is my text uploaded anywhere?
No. Everything runs locally in your browser with no network requests, so your list never leaves your device and nothing is stored. That makes it safe for email lists, internal data, or anything private.