Paste any text to find words you've used more than once.
Repeated words
A duplicate word checker scans a piece of writing and flags every word that appears more than once, then sorts those repeated words by how often they show up. Instead of manually rereading a document line by line hoping to spot repetition, you paste your text in and get an instant breakdown: total word count, unique word count, and a list of every word you've reused, ranked from most to least frequent.
Using the tool is simple. Paste any text into the box — an email, essay, article, product description, or social media post — and click Check (or press Ctrl+Enter). The tool immediately tokenizes your writing, counts every occurrence of every word, and highlights repeated words directly in the text so you can see exactly where they show up. Toggle "Ignore common words" if you want to filter out function words like "the," "a," and "is" that are naturally used often and rarely worth changing, so you can focus on the content words — nouns, verbs, and adjectives — that actually affect how varied your writing sounds.
This kind of check is especially useful during proofreading and editing, when it's easy to lose track of word choices after staring at the same paragraph too long. Students use it before submitting essays to avoid looking repetitive, bloggers and copywriters use it to keep content feeling fresh rather than mechanical, and it also doubles as a quick way to catch accidental typos — like typing "the the" — since those show up as high-frequency repeats. Because everything runs locally in your browser, no text ever leaves your device, making it a fast, private way to tighten up any piece of writing before it goes out.