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AI Plagiarism & Copy Checker
AI Plagiarism & Copy Checker reviews a document with a language model and reports an estimated similarity figure, an AI-writing signal, readability and sentence-level flags. It is a second opinion on a draft, not a database match: read the limitations below before relying on it.
How to use AI Plagiarism & Copy Checker
- Paste the text you want reviewed.
- Connect your own OpenRouter key in the panel above.
- Run the check and read the sentence-level flags alongside the scores.
Where AI Plagiarism & Copy Checker is useful
- Spotting passages in your own draft that read as borrowed or overly generic.
- Getting a quick readability reading before publishing.
- Flagging sentences that sound machine-written so you can rewrite them.
- Checking a submitted piece before deciding to edit it further.
Formats, algorithms and limits
The analysis is a language-model judgement over the text you paste. It does not query a plagiarism database or crawl the web, so a "similarity" figure is the model's estimate of how derivative the writing reads, and any source suggestions are model recollections that must be verified before you act on them. Nothing is submitted anywhere except your own key's model provider.
Troubleshooting and honest limits
- Treat the scores as directional, not evidential: no AI judgement should be the sole basis for an accusation.
- Rewrite flagged sentences in your own words and re-run the check rather than trusting a single pass.
- Always cite real sources from your own research — the model may misremember titles and links.
Frequently asked questions
Does this check against a global database of articles?
No, and you should be sceptical of tools that claim to do so instantly for free. It is a language-model review of the text you paste; for institutional decisions use a service with a documented corpus and reporting process.
Can the result be used as proof?
No. It is an automated estimate with the known weaknesses of such estimates: false positives on common phrasing and false negatives on paraphrased text. Use it as a hint for editing, never as evidence about a person.
Where do the suggested sources come from?
The connected model may recall documents that resemble the flagged text, but it can also be mistaken. Verify any source yourself before citing it.
Is my document uploaded?
It is sent from your browser to OpenRouter using your own key, so this site never receives or stores it.
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Page written and reviewed by the FreeConvertio engineering team on 2026-10-14. AI Plagiarism & Copy Checker runs entirely in your browser — no uploads, no account and no daily limits.