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Plagiarism Checker

Model:
Honest disclosure: we do not crawl the live web. This tool runs two independent passes: (1) AI-pattern analysis, how likely the text was machine-generated, and (2) an optional fuzzy-match against a reference text you paste or upload. For graded academic work use Turnitin; for paid web-wide scans use Copyscape or Quetext. What we do well: pre-submission sanity checks, catching obvious self-copying, and detecting AI ghost-writing.
0 chars · 0 words
Flags passages that read as if generated or ghost-written by an AI model. Uses perplexity-style reasoning, not a true web search.
QuickStandardDeepForensic
Up to ~60K characters. The comparison uses word-level LCS (longest common subsequence), the same algorithm Git uses for diffs.
~100 tokens per use
Originality score
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AI-written likelihood
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Reference overlap
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Full report
Humanize AI-flagged parts Paraphrase overlaps Deeper AI check
Advanced options
Result
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Want better results? Premium models (GPT-5, Claude, Gemini) deliver higher quality.View Plans

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Run a pre-submission originality check: detect AI patterns, flag self-copied passages and measure overlap with a reference text.

How to Use Plagiarism Checker

1
Open Plagiarism Checker

Open Plagiarism Checker on Rewind.ai. No account needed to start.

2
Add your input

Enter your text or upload a file, then set any options Plagiarism Checker offers.

3
Get the result

Plagiarism Checker runs on our own GPU servers and returns a result in seconds. Download it, copy it, or share the link.

Use this tool via API

Call this tool straight from your own scripts. The endpoint follows the OpenAI REST format and signs requests with a bearer token, so client libraries you already use keep working. You are billed the same token rate as the web app.

API DocumentationGet API Key
curl -X POST https://api.rewind.ai/v1/chat/completions/ \
  -H "Authorization: Bearer sk-rewind-..." \
  -H "Content-Type: application/json" \
  -d '{"model": "qwen/qwen-2.5-7b-instruct", "messages": [{"role": "user", "content": "Sanity-check this passage for AI patterns and reference overlap..."}]}'

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Plagiarism Checker FAQ

Plagiarism Checker on Rewind.ai is a free AI tool. There's no charge and no sign up needed to start.

Yes. You get 2,500 free tokens per day to use Plagiarism Checker and every other tool on Rewind.ai. A free account raises that to 5,000 tokens/day. You can buy more starting at $1.

Plagiarism Checker runs open-source AI models on our GPU servers. Send your request and the result comes back in seconds.

No. You can use Plagiarism Checker right away without signing up. A free account doubles your daily usage to 5,000 tokens and saves your history.

Anonymous users get 2,500 tokens/day. Free accounts get 5,000 tokens/day. Tokens reset every 24 hours. Each generation costs ~100-5,000 tokens depending on the operation.

Your data is processed on our servers and isn't stored permanently unless you choose to save it. We don't sell or share it.

Yes. Content from Plagiarism Checker is yours to use for personal or commercial work. The AI models we run are commercially licensed.

Plagiarism Checker matches the quality of paid services because it runs the latest open-source AI models. The difference is you don't pay per use.

Plagiarism Checker runs open-source AI models including Qwen 2.5, FLUX and Whisper. We update to newer models as they ship.

Yes. Plagiarism Checker works in any mobile browser, and the layout adapts to your screen size.

Sign up for a free account to get 5,000 tokens/day, double the anonymous limit. Or buy token packs starting at $5 for 200,000 tokens. See /pricing/ for all options.

Yes. After you generate content, you can download it, copy it, or share it via a unique link. Signed-in users can also view their generation history.

Sign up free for 10,000 tokens

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