Paste your list below, then click Run.
Duplicate Word Remover Online
Paste a list into the editor and click Run: Duplicate Word Remover compares every line, drops the exact repeats, and shows the cleaned list in the output box below. The first copy of each line is always kept, and the surviving lines stay in the order you pasted them. Everything runs in your browser tab - no upload, no account, no signup.
Lines, not words: what actually counts as a duplicate here
Duplicate Word Remover compares whole lines, not individual words inside a sentence, and the match is exact. It works best on one-entry-per-line lists like emails, tags, SKUs, or usernames rather than flowing prose: if two repeated words sit on the same line, pasting one long paragraph will not remove either of them.
| Pasted lines | What happens |
|---|---|
| "Apple" then "apple" on the next line | Both kept - the match is case-sensitive, so different capitalization counts as a different line |
| "hello" then "hello " (trailing space) on the next line | Both kept - no whitespace trimming happens before the comparison |
| "hello" typed twice, identical | Only the first "hello" survives; the second is removed |
Blank lines follow the same rule: several blank lines in a row collapse down to a single blank line, because an empty line is compared against other empty lines exactly like any other text.
Running the check and copying your result
Click Run each time you want a fresh result - the output does not update live while you type, so run it again after editing the pasted list. There is no one-click Copy button on this tool, so select the cleaned list and copy the text yourself (the whitespace remover and slug generator on this site do include one).
For example, pasting eight email addresses where two of them each appear twice leaves six surviving lines after clicking Run, in their original top-to-bottom order.
A common gotcha: invisible line-ending characters
If two lines look completely identical but Duplicate Word Remover keeps both of them, an invisible line-ending character is the usual cause. The checker splits your pasted text only on the newline character, so a line that came from a file saved with Windows-style line endings carries a trailing carriage-return character that a line typed straight into the box - or copied from a Mac- or Linux-saved file - does not, and that hidden character makes the two register as different text. It shows up most often when a list is assembled from more than one source, such as a spreadsheet export plus a manually typed addition.
To confirm it is the cause, delete one of the two look-alike lines, retype it by hand, and click Run again - if the duplicate now disappears, a hidden line-ending character was the reason. Pasting the whole list from a single consistent source clears the mismatch too.
Good uses for a line-based duplicate check
Typical jobs: cleaning up a pasted email or contact list before a mailing, removing repeated tags or keywords from a list built up over time, deduplicating rows exported from a spreadsheet as plain text, and trimming a repeated entry out of a pasted log file. Any plain-text list behaves the same way whatever produced it.
What this tool does not do
A near-duplicate is kept: two lines that differ by a single letter, an extra trailing word, or different punctuation both survive, because neither similarity scoring nor fuzzy matching is performed. The exact, case-sensitive, whitespace-sensitive behaviour in the table above is also fixed - there is no settings toggle anywhere on the page to switch the comparison to case-insensitive or to trim whitespace first.
Duplicate Word Remover also does not sort your list into alphabetical order (the separate sort-lines tool on this site handles reordering), does not fix typos, and does not merge two lines that mean the same thing but are worded differently. It does not remember your list once you leave the page either - everything lives only in the browser tab for the current visit.
Frequently Asked Questions
Does this remove repeated words inside one line, or only repeated lines?
Only whole repeated lines. Word-level repeats inside a single line or sentence are left untouched, since the checker compares one full line at a time against the lines above it.
Is the duplicate check case-sensitive?
Yes. "Apple" and "apple" are kept as two separate lines because the comparison is an exact, case-sensitive match.
Why didn't a line get removed even though it looks identical to another one?
A trailing or leading space makes two otherwise-identical lines count as different, because no whitespace trimming happens before the comparison. Retype or trim the spacing and run it again.
Does the result update automatically while I type?
No. Click Run to see the result, and click Run again after editing the pasted list - there is no live, on-input update for this tool.
Can I copy the cleaned list with one click?
Not on this tool - select the result text yourself and copy it. A few of the other text tools on this site do include a one-click Copy button; this one does not.
What happens to blank lines in my pasted list?
They are treated the same as any other line, so several blank lines in a row collapse down to a single blank line in the result.
Is there a limit on how much text I can paste in?
The tool itself does not enforce a line or character limit - it checks whatever text is in the box when you click Run. A very long list is limited only by how well your browser's own text box handles that much text, not by anything the tool restricts.