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Duplicate Word Finder

Spot accidentally repeated words that spell checkers miss

0 words

Catch the Typos That Spell Checkers Miss

Accidentally typing a word twice is one of the most common writing errors — and one of the hardest to catch during manual proofreading. Your eyes glide over"the the" because your brain auto-corrects it. Spell checkers ignore it because both words are spelled correctly. This tool catches every instance by comparing each word to the one directly before it.

How Detection Works

The finder tokenizes your text into words and compares each word to its predecessor, case-insensitively. When two identical words appear in sequence, both are highlighted. The check works across sentence and paragraph boundaries, so a duplicate split across two lines is still caught. Punctuation attached to words is stripped for comparison but preserved in the display.

Common Causes of Duplicate Words

Most duplicates come from editing — you rewrite the beginning of a sentence but leave the old first word in place. Copy-pasting across documents is another source, especially when a word falls at the boundary of the pasted block. Line breaks in narrow text editors can hide duplicates that span two visual lines. And sometimes the keyboard just stutters. Whatever the cause, the fix is the same: delete one instance.

Intentional Repetition

Not all adjacent duplicates are errors."That that" is grammatically correct in certain constructions. Rhetorical repetition ("never, never give up") is a deliberate stylistic choice. The tool highlights all instances so you can evaluate each one in context. If the repetition is intentional, leave it. If it is a typo, delete the extra word.

Privacy

All processing runs in your browser. No text is transmitted or stored.

$ faq

What counts as a duplicate word? ▸
A duplicate word is any word that appears twice in a row —"the the,""is is,""and and." These are almost always typos caused by editing, copying, or line breaks. The tool flags exact adjacent matches (case-insensitive) so you can spot them instantly.
Does this tool catch near-duplicates or just adjacent ones? ▸
It focuses on adjacent duplicates — the same word appearing back to back with nothing in between. These are the errors that spell checkers miss because each individual word is spelled correctly. Intentional repetition like"very very" is also flagged so you can decide whether to keep it.
Why don't spell checkers catch duplicate words? ▸
Spell checkers verify that each word is a valid dictionary entry. Since both instances of"the the" are correctly spelled, no error is raised. Grammar checkers sometimes catch duplicates, but many miss them across line breaks or paragraph boundaries. A dedicated duplicate finder is more reliable for this specific error.
What if the repetition is intentional? ▸
Some repetition is deliberate —"that that" can be grammatically correct ("I know that that idea works"), and rhetorical repetition is a valid literary device. The tool flags all adjacent duplicates and lets you decide. Review each instance in context before removing it.
Does this work across sentences and paragraphs? ▸
Yes. The tool checks word-to-word adjacency across the entire text, including across sentence boundaries and paragraph breaks. A duplicated word at the end of one sentence and the start of the next is caught.
Can I use this for languages other than English? ▸
The tool compares adjacent words character by character, so it works with any language that uses space-separated words. It will detect"das das" in German or"le le" in French just as reliably as English duplicates.
Is any data sent to a server? ▸
No. All processing happens locally in your browser using JavaScript. Your text is never transmitted or stored.