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Remove Duplicate Words

Delete repeated words while the first occurrence and all punctuation survive, with a consecutive-only mode for fixing the classic the the typo.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Paste the text that contains repeated words.
  2. 2.Choose case sensitivity and whether to collapse only immediately repeated words.
  3. 3.Check how many duplicates were removed, then copy the cleaned text.

About Remove Duplicate Words

Remove Duplicate Words deletes repeated words from pasted text while keeping the first occurrence of each, which is a different job from the site's duplicate-line remover: that one compares whole lines, this one works inside them. Paste the text, choose how strict to be, and copy back a version where every word appears once.

Two switches control what counts as a repeat. Case sensitivity is off by default, so The and the are the same word, and the survivor keeps its original casing, the first form you wrote is the one that stays. The consecutive-only mode narrows the tool to the classic editing typo: it collapses immediately repeated words like the the or very very while leaving legitimate distant repeats alone, and it deliberately does not fire across punctuation, so the emphatic no, no survives untouched. With the mode off, deduplication is global across the whole text.

A word here is a run of letters, digits, apostrophes and hyphens, matching the site's other word tools, so don't is one word and well-known is one word, not two halves. Punctuation is never a word and is never removed. When a duplicate goes, exactly one adjacent space or tab goes with it, the one before the word when available, otherwise the one after, so the text does not fill with doubled separators; newlines are never consumed, and the layout of what survives is otherwise untouched. That one-separator rule is deterministic and pinned by tests, including its honest edge: removing a duplicate that sits between two spaces leaves a single space behind rather than silently rewriting your whitespace.

The operation is idempotent in every option combination, running the output through again changes nothing, which makes it safe in repeated cleanup pipelines. The result reports exactly how many duplicates were removed, so a paste that comes back shorter is auditable rather than mysterious. Input is capped at one million characters and processes in a single linear pass; a flood of half a million repeated words clears in well under a second. Everything runs in your browser, and the text is never uploaded, stored or attached to an account.

Use it for cleaning keyword lists where the same term crept in twice, tidying transcripts and dictated text where words double under hesitation, deduplicating tag collections and search queries, repairing copy-paste accidents where a phrase landed twice, or as the word-level companion to the duplicate-line remover in any data-cleaning chain. What it does not do is equally plain: it does not judge meaning, so two different words that mean the same thing both stay; it does not remove repeated phrases, only repeated single words; and it does not normalize your whitespace beyond the one separator that accompanies each removed word. A cleanup tool earns trust by doing exactly what it says, and the rules above are the whole of what this one does: read them once, and every output the page ever produces follows from them, with the removal count as your receipt for each run.

Methodology & sources

Tokenize words as runs of letters, digits, apostrophes and hyphens, compare under the chosen case rule, keep each first occurrence, remove exactly one adjacent space or tab per deleted duplicate while never touching newlines or punctuation, and report an exact removal count from a single linear pass.

Frequently asked questions

Which copy of a repeated word survives?
The first occurrence, in its original casing. With case sensitivity off, The and the count as the same word and whichever appeared first is kept as written.
Will it break no, no or other deliberate repeats?
The consecutive-only mode fires solely when the gap between repeats is whitespace, so no, no survives. Global mode does remove distant repeats, which is exactly its purpose; choose the mode that matches your intent.
How is this different from the duplicate line remover?
That tool compares entire lines and removes repeated lines. This one works at word level inside the text, keeping the first occurrence of each word.

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