Remove Duplicate Words
Paste text, pick a scope (per-line, per-sentence, or whole text), and the tool strips repeated words while keeping the original order. See exactly which words were duplicated and how many copies were removed.
How to use the duplicate word remover
1. Paste the text
Drop the text with repeated words into the Input box. It can be a single sentence, a paragraph, a pasted email, a list of items, or a longer document. The tool works on prose, lists, and code comments equally well.
2. Pick a scope
Three options control how aggressive the dedup is. Per line only collapses repeats inside the same line, so list-style inputs keep their structure. Per sentence splits on ., !, and ? and dedups inside each sentence. Whole text (default) is the most aggressive: any word that appears more than once anywhere in the input loses every copy past the first.
3. Set the toggles
Four toggles cover the common edge cases. Case-sensitive defaults off, so "Word" and "word" collide. Keep first occurrence is on by default; turn it off and the last copy of each word survives instead. Ignore punctuation when comparing means "word," and "word." are treated as the same token (the surviving copy keeps its punctuation). Show breakdown displays a list of which words were duplicated and how many copies were dropped.
4. Clean and copy
Click Clean. The deduped text appears on the right with a count of removed duplicates and a per-word breakdown. Use the Copy button to grab the result, or Download to save a .txt file.
When you need to remove duplicate words
Repeated words sneak into text in more places than people realize. Here are the most common situations where you want them gone.
Per-line vs per-sentence vs whole-text scope
The scope setting is the biggest single lever in this tool. Picking the wrong one is the most common cause of "the output is not what I expected" feedback. Here is a side-by-side.
| Scope | How it splits | Best for |
|---|---|---|
| Per line | Splits on every newline. Each line is a separate dedup unit. | List inputs (one item per line), CSV rows, address lists, code comments. |
| Per sentence | Splits on ., !, ? followed by whitespace. Each sentence is a separate dedup unit. | Prose where you want to catch "the the" or "and and" inside one sentence but keep repeats across sentences. |
| Whole text | No splitting. The first occurrence of every word survives across the entire input. | Keyword lists, tag sets, vocab extraction, unique-word counting. |
If your input is plain prose and you only want to fix stutters, use per-sentence. If it is a list, use per-line. If you want every word once in the whole document, use whole text.
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Frequently asked questions
What does duplicate word removal actually do?
The tool scans your text, finds words that appear more than once within the scope you choose (per-line, per-sentence, or whole text), and removes every copy after the first (or after the last, if you flip that toggle). Word order is preserved. By default, capitalization is ignored so "Word" and "word" count as the same token.
What is the difference between per-line, per-sentence, and whole-text scope?
Per-line: dedup happens inside each line, so "the cat the cat" becomes "the cat" but a separate line that also contains "the" is left alone. Per-sentence: each sentence (split on . ! ?) is deduped on its own. Whole text (default): the first occurrence of any word survives, and every later copy anywhere in the document is dropped.
How does case-sensitive matching work?
With case-sensitive OFF (the default), "Apple" and "apple" are treated as the same word, and only one survives. With it ON, capitalization counts, so a sentence-initial "The" will not collide with a mid-sentence "the". Most prose cleanup wants the toggle OFF. Code or identifier cleanup usually wants it ON.
What does Ignore punctuation when comparing do?
When this toggle is on, the comparison strips punctuation from each word before matching. So "word," and "word." and "word" are treated as the same token. The punctuation on the surviving word is kept. Turn it on for prose. Turn it off if you are deduping data tokens where the punctuation is meaningful.
Will the tool remove different forms of the same word (run, ran, running)?
No. The tool matches on the surface form of the word, not its lemma or stem. "run" and "running" are different tokens and both will survive. If you need lemma-aware deduplication, you need a stemmer or a thesaurus-aware tool, not a simple deduplicator.
What is the difference between keeping the first and keeping the last occurrence?
Keep first (default) drops every copy after the first time a word appears. Keep last drops every earlier copy and only the final occurrence survives. Use keep last when later mentions carry the right capitalization or punctuation context, for example when a list ends with the canonical form.
Does the duplicate breakdown count the surviving copy?
No. The breakdown shows how many copies were removed for each word, not the total count. A word that appeared four times in your input shows as "word x3 removed" (the original survives, three were dropped).
I'm deduping keyword lists for an SEO brief and tag taxonomies. Could a competitor's tool pick up what I pasted?
No. The word-dedup pass runs in your browser using JavaScript Set logic. Your keyword list, tag taxonomy, and any other brief material stay on your device and don't leave this page. See also: Character Frequency. See also: All removers.
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