⚡ Utility → Plagiarism Checker
🔍
Plagiarism Checker
Compare two texts and instantly detect duplicate sentences, matching phrases, and overall similarity percentage. Useful for students, writers, and educators.

// Compare Two Texts

Original / Source Text 0 words
Text to Check 0 words
Similarity Score
0%
✅ Low Similarity
Matched Sentences
0
Total Sentences
0
Unique Sentences
0
// Highlighted Result — red = matched, white = unique

What is this Tool?

The Plagiarism Checker compares two pieces of text and calculates a similarity score based on matching sentences and phrases. It highlights which parts of your text overlap with the source, making it easy to identify copied content. This tool works entirely in your browser — no text is ever uploaded to any server, making it completely private and secure.

This is a document-to-document comparison tool. It is ideal for checking if a student's submission matches a reference document, comparing a paraphrased version against the original, or verifying that rewritten content is sufficiently different from the source material.

How to Use This Tool

1
Paste your original or reference text in the left box.
2
Paste the text you want to check in the right box.
3
Click Check Plagiarism.
4
The similarity percentage, matched sentence count, and a colour-highlighted breakdown of matched vs unique sentences are shown instantly.
5
Rewrite the highlighted red sentences to reduce similarity and improve originality.

Why This Matters

Frequently Asked Questions

Q: What similarity percentage is considered plagiarism?
A: Generally, a similarity score below 15% is acceptable for academic work. 15-30% is borderline and warrants review. Above 30% is typically considered high plagiarism. However, standards vary by institution — always check your university or publisher's specific policy.
Q: Does this tool search the internet for plagiarism?
A: No. This tool compares the two texts you paste directly — it does not search the web or any database. For internet-wide plagiarism checks, tools like Turnitin, Grammarly, or Copyscape are used. This tool is best for document-to-document comparison.
Q: Is my text stored or sent to a server?
A: No. All comparison happens entirely in your browser using JavaScript. Your text is never sent to any server, stored anywhere, or seen by anyone. This makes the tool completely private and safe for sensitive content.
Q: How is the similarity score calculated?
A: The tool splits both texts into sentences and checks how many sentences in the checked text have a strong match in the original text. The score is the percentage of checked sentences that closely match the source. It also performs phrase-level matching to catch partial similarities.
💡 Pro Tip: If a sentence is flagged as matching, don't just change a few words — restructure the entire sentence. True paraphrasing means conveying the same idea in a completely different sentence structure, not just swapping synonyms. Changing word order and adding your own analysis makes rewritten content genuinely original.