Your text
Report
Results appear here. Matching sentences are listed in pairs with their sentence numbers.
This checks for repetition inside your own text. It does not search the internet or other documents.
What this tool does
The Duplicate Sentence Finder scans one piece of writing and shows where it repeats itself: sentences that appear twice, sentences that say almost the same thing in slightly different words, and four-word phrases you keep reusing. It is useful for long essays, reports, product descriptions and articles that were assembled from several drafts.
It is not an internet plagiarism checker. Nothing is compared with websites, journals or other students’ work, and your text never leaves your browser. To check for copying from published sources, use a service that searches an index of the web, such as the checker built into your school’s learning platform.
How to use it
- Paste your text. Each sentence needs at least four words to be compared.
- Set the sensitivity. At 60%, two sentences are flagged when most of their meaningful words are the same. Lower values catch looser paraphrases; higher values show only close copies.
- Click Find repeated sentences. Shared words are highlighted in each pair so you can decide which sentence to cut or rewrite.
How the matching works
Common words such as “the”, “and” and “is” are ignored. For every pair of sentences the tool counts the remaining words they share and divides by the total number of different words in both (the Jaccard index). Identical sentences score 100%. Repeated phrases are found by counting every run of four consecutive words.
Tips for fixing repetition
- Keep the clearer sentence of each pair and delete the other, or merge the two into one stronger sentence.
- A phrase repeated many times often signals a filler habit (“it is important to note that”). Replace it or remove it.
- In long reports some repetition is deliberate, for example a summary that restates the conclusion. Only fix the repeats that add nothing.