Duplicate Word Finder

Paste a block of text and instantly see any duplicate or accidentally repeated words highlighted — catching the kind of slip that’s easy to type but hard to spot by re-reading your own writing.

Accidentally typing “the the” or repeating a word across a line break is a genuinely common slip that spell-checkers usually don’t catch, since both instances of the repeated word are correctly spelled individually. It’s also a specific type of error that’s notoriously hard to catch by proofreading your own writing, since your brain tends to read past the duplication rather than flagging it.

Paste your text, and any immediately repeated words are highlighted directly in context. Toggle whether to catch only exact adjacent repeats (the most common typo pattern) or flag any word that appears unusually often throughout the whole text, which can be a sign of repetitive phrasing worth varying even if it’s not a strict typo.

Frequently asked questions

Does this only catch words that are directly next to each other, or any repetition anywhere in the text?

Both modes are available — adjacent-repeat detection catches the classic “the the” typo pattern specifically, while the broader frequency mode flags words used unusually often across the entire text, which is more about writing style than typo-catching.

Will it flag intentional repetition, like a word used for emphasis or in a quote?

It flags based on pattern matching alone and can’t distinguish intentional stylistic repetition from an accidental typo, so treat flagged instances as things worth a quick look rather than automatic errors — you know your own intent better than a pattern matcher can.

Is this case-sensitive — would it catch “The the” with different capitalization?

By default, matching is case-insensitive, so a duplicated word is caught even if one instance is capitalized (like at the start of a sentence) and the other isn’t, since that’s still the same underlying typo pattern.

Can this replace a full proofreading pass or spell-checker?

No — it catches one very specific type of error (repeated words) and isn’t a substitute for a broader grammar or spell-check pass, which would catch a different category of mistakes entirely.