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Plagiarism Checker

Detect internal self-similarity using Jaccard and Cosine algorithms. Outputs a uniqueness score per document.

⚙ Settings
45%

Pairs above this threshold are flagged as similar.

📋 Input Text
🌐 How It Works
  • Step 1 — Splits text into sentences, filters stop words
  • Step 2 — Internal Jaccard + Cosine self-similarity
  • Step 3 — Searches DuckDuckGo for exact sentences online
  • Step 4 — Shows real source URLs where text was found
  • Step 5 — Computes combined uniqueness score
✓ Real internet search — Uses DuckDuckGo to check if your sentences appear online. No API key required.
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Paste text and click Analyze to begin