Duplicate Word Finder & Remover

Repeated words slip into every draft: the same adjective three times in a paragraph, or an accidental “the the” where a line was edited. This tool lists the words you use more than once with how often, fixes doubled words, or cleans a list of keywords or tags by keeping only the first copy of each word. It works with any language your browser can split into words, including Korean, Japanese and Chinese.

How to use this tool

1. Paste your text or word list.
2. Choose to list repeated words, fix accidental doubles, or remove every repeat.
3. For the list and removal, set the minimum word length and whether to ignore common words like “the” and “and”.
4. Copy the result; the tables show each repeated word and every double that was found.

Formula

Repeated word = a word whose count is 2 or more after lower-casing (unless case-sensitive), ignoring short and common words

Words are found with the browser’s Unicode word segmenter (Intl.Segmenter), which handles apostrophes, accents and scripts without spaces. An accidental double is the same word twice in a row with only spaces or a single line break between them; a comma or full stop in between means it is not a double. “Had had” and “that that” are often correct and are kept. When removing repeats, the separator after the removed word (space, comma or semicolon) goes with it, so lists stay tidy.

Example

In the sample paragraph, “results” appears 3 times, while “team” and “design” appear twice each; “the” is ignored as a common word. The tool also finds two accidental doubles, “the the” and “and and”, and the fix mode removes the second word of each.