Plagiarism Checker
Compare two texts to find matching phrases and calculate similarity. Perfect for checking originality.
Source Text (Original)
Text to Check
Phrase Detection
Finds matching sequences
Similarity Score
Percentage overlap
Detailed Report
Exportable results
100% Private
No data stored
What is Plagiarism?
Plagiarism is using someone else's words, ideas, or work without proper attribution. It's a serious issue in academia, journalism, and content creation. This tool helps identify matching text between two documents so you can ensure originality or proper citation.
Understanding Similarity Scores
| Score | Status | Interpretation |
|---|---|---|
| 0-20% | Low | Likely original content, minimal matches |
| 20-40% | Moderate | Review recommended, may need citations |
| 40-60% | High | Significant overlap, needs revision |
| 60%+ | Very High | Major concerns, substantial copying |
Important Notes
- Local comparison only: This tool compares the two texts you provide, not the entire internet
- Phrase-based: It detects exact phrase matches, not paraphrasing
- Privacy-first: All processing happens in your browser; nothing is uploaded
- Use cases: Perfect for checking drafts against sources, comparing versions, or verifying quotes
Frequently Asked Questions
How does this checker work?
It finds matching phrases between the two texts you provide and calculates what percentage overlaps.
Does it check against the internet?
No, it only compares the two texts you paste. For internet-wide checking, use a service with web crawling.
What similarity is acceptable?
Under 20% is generally fine. 20-40% may need review. Over 40% often needs attention.
Is my text stored?
Absolutely not! All comparison happens in your browser. Nothing is ever uploaded.