About Plagiarism Checker (Text Compare)
The Plagiarism Checker compares two texts against each other and reports how similar they are — an overall percentage based on shared 5-word phrases, plus a list of sentences that are near-duplicates between the documents.
Use it to check a rewrite against the original source, compare two student submissions, verify that spun or paraphrased content is genuinely different, or ensure your own draft doesn't track a reference too closely.
Unlike web-based plagiarism services, this tool doesn't search the internet — it's a private, local comparison between the two texts you paste. Nothing is uploaded, indexed or retained.
How to Use the Plagiarism Checker (Text Compare)
- Paste the first text into the left box and the second into the right.
- Click Compare texts.
- Review the similarity score and the list of near-duplicate sentence pairs.
Features
- Overall similarity score from 5-word phrase overlap
- Sentence-level matching with per-pair overlap percentages
- Handles thousands of words instantly
- Fully private — no web search, no upload
Frequently Asked Questions
Does it check against the internet?
No. It compares only the two texts you provide, locally in your browser. For web-wide plagiarism detection you'd need a service with a search index — this tool is for direct document-to-document comparison.
What similarity score means plagiarism?
There's no universal threshold, but above ~30% phrase overlap between independent documents is unusual, and above 60% almost always indicates copying or light paraphrasing. Always review the matched sentences yourself.
Is the Plagiarism Checker free?
Yes, the Plagiarism Checker is completely free with no usage limits. No signup, no account and no installation required.
Is my data safe?
Yes. All processing happens locally in your browser using JavaScript — nothing you type is uploaded or stored on our servers.
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