About Plagiarism Detector

Detect plagiarized content and calculate originality percentage. Part of the DevTools Surf developer suite. Browse more tools in the Web / Frontend collection.

Use Cases

• Check student submissions for copied passages before grading.
• Screen marketing copy for unintentional duplication of competitor content.
• Verify freelance writing deliverables before paying and publishing.
• Self-check academic manuscripts before journal submission.

Tips

• Break long documents into sections before checking — similarity scores are more meaningful per-section than for a 10,000-word document as a whole.
• Compare against your own prior work to catch self-plagiarism before submitting academic papers.
• Use the originality percentage as a starting flag, not a final verdict — common technical phrases will always appear in multiple sources.

Fun Facts

• Turnitin, the most widely used academic plagiarism detection platform, was founded in 1998 and processes over 200 million submissions per year as of 2023.
• The word 'plagiarism' derives from the Latin 'plagiarius' (kidnapper) — Roman poet Martial used it in the 1st century AD to accuse another poet of stealing his verses.
• Studies published in the journal Computers & Education found that awareness of plagiarism detection software reduced submitted plagiarism by 30–40% even before any checks were run.

FAQ

What originality percentage is acceptable for academic work?

Most universities flag submissions above 15–20% similarity. Thresholds vary by institution and field — technical papers with shared terminology naturally score higher.

Does it detect paraphrasing?

Basic detectors catch direct copying. Paraphrase detection requires semantic similarity analysis, which is more computationally intensive and less precise.

Can it check against private databases?

This tool performs local text analysis. For checks against published web content or academic databases, dedicated platforms like Turnitin or Copyscape access indexed sources.