Internal Duplicate Text Checker

Checks a text for duplicates inside itself (lines, sentences, or word shingles).

Internal Duplicate Text Checker is a lightweight Chrome extension designed to help users detect duplicated content inside a single block of text. Users can paste any text into the extension and instantly analyze internal repetition using multiple methods: Line duplication – finds repeated lines Sentence duplication – detects repeated sentences Word shingle duplication – identifies repeated word sequences (n-grams) The extension provides a clear overview of: Total analyzed items Unique fragments Duplicate occurrences Overall uniqueness percentage All processing is performed locally inside the browser. The extension does not collect, store, transmit, or share any user data. No accounts, logins, or network connections are required. Key characteristics: Fully offline operation No permissions required No tracking or analytics Simple, single-purpose functionality Designed for writers, editors, SEO specialists, and content creators This extension is intended solely for checking internal text duplication and does not analyze external websites or third-party content.