How does duplicate word removal work?

It scans your text and removes repeated words — either every repeat throughout the text (keeping the first use) or just accidental adjacent duplicates like 'the the'. You choose the mode.

What's the difference between removing all duplicates and adjacent ones?

'Remove all' keeps only the first occurrence of each word anywhere (good for deduplicating word/tag lists); 'adjacent only' fixes the common typing error of doubling a word ('and and', 'is is') while preserving normal repetition in prose.

Will it ruin normal writing that repeats words?

In adjacent-only mode, no — it only catches back-to-back repeats, which are almost always errors. Full-deduplication mode is meant for lists and tag strings, not prose, since normal sentences legitimately reuse words.

Does it handle case and punctuation?

Yes — case-insensitive mode treats 'The' and 'the' as duplicates; punctuation-aware matching prevents 'run' and 'run,' from being seen as different when you don't want them to be.

Is it good for keyword and tag lists?

Ideal — paste a space- or comma-separated tag list and full-dedup mode returns each unique word once, cleaning up merged keyword sets in seconds.

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Remove Duplicate Words — Two Jobs, One Tool

"Duplicate words" means two different problems: the accidental "the the" that slips into writing, and genuinely repeated entries in a word or tag list. This free tool handles both — an adjacent-only mode that proofreads prose safely, and a full-deduplication mode that reduces a list to unique words — with case and punctuation options. In-browser, no signup.

Choosing the Right Mode

Mode	Removes	Use for
Adjacent only	Back-to-back repeats ("is is")	Proofreading prose
All duplicates	Every repeat, keeps first	Tag/keyword/word lists

This distinction is the whole design. Prose should repeat words — "the" appears dozens of times legitimately — so running full deduplication on an essay would wreck it. Adjacent mode targets only the doubling error; full mode is for lists where each word should appear once.

The Doubled-Word Typo

"I think that that is correct" — did you mean the double "that" (grammatically valid) or fat-finger it? Adjacent-duplicate detection surfaces every back-to-back repeat so you can judge each one. These slip past spellcheck constantly because each individual word is spelled correctly; they're among the most common errors in fast-typed drafts and the hardest to self-spot, since the brain reads the intended sentence. A machine that flags every "word word" catches what your eye skips.

Cleaning Word and Tag Lists

Merge tag sets from two sources and you get "seo, marketing, seo, content, marketing" — full-dedup mode returns "seo, marketing, content" in one pass, case-normalized so "SEO" and "seo" collapse together. The same applies to keyword research exports, comma-separated categories, and any list where duplicates inflate counts. (For deduplicating whole lines rather than words, use our remove duplicate lines tool.)

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All processing is local — drafts and keyword lists never leave your device. Unlimited use, no account.

Remove Duplicate Words

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