Plagiarism Checker
Check text uniqueness or compare two documents for similarity. Uses advanced n-gram analysis, cosine similarity, and sentence matching.
How It Works
Our plagiarism checker offers two powerful modes for content analysis:
Check Uniqueness
Paste your text and the tool analyzes each sentence for uniqueness indicators. Sentences with personal pronouns, specific details, and informal language are flagged as likely unique. Formal, textbook-style sentences are flagged for manual verification. Each sentence includes a Google search link so you can check for exact matches online.
Compare Texts
Paste two texts side-by-side and get a detailed similarity breakdown using three proven algorithms:
- Cosine Similarity — Measures word frequency overlap between documents
- Jaccard Index — Calculates n-gram (word sequence) overlap
- Phrase Matching — Finds identical 5-word phrases across both texts
The tool also performs sentence-level matching to identify the most similar passages between both texts.
Frequently Asked Questions
How does plagiarism checking work?
The tool offers two modes: Uniqueness Check analyzes each sentence for personal, generic, or textbook-style patterns and provides Google search links for manual verification. Compare Texts uses Jaccard similarity, cosine similarity, and n-gram matching to measure overlap between two documents.
Is my text safe and private?
Absolutely. All analysis runs 100% in your browser using JavaScript. No text is uploaded, stored, or sent to any server. Your content never leaves your device.
Can this replace paid plagiarism tools?
This tool is great for quick checks and text comparison. For comprehensive web-based plagiarism scanning against billions of pages, you may still need a paid service. Our tool excels at document-to-document comparison and provides Google search links for manual web checking.