ChatGPT Plagiarism Checker Free: Tools to Detect AI-Generated Text [2023]

ChatGPT has taken the world by storm, with its ability to generate amazingly high-quality text on any topic with just a prompt. However, this has also raised concerns about AI plagiarism as more students, writers, and marketers use ChatGPT to produce written content.

Thankfully, various free plagiarism checkers can now detect text created by ChatGPT and other AI. In this guide, we’ll compare the top options and how they flag AI content.

Why AI Plagiarism Detection Matters

Here are some key reasons why identifying AI-written text is becoming crucial:

  • Academic integrity: Schools and universities need to combat cheating if students submit AI-generated essays or assignments.
  • Content quality: Publishers want high-quality, original human-written content, not AI content farmed at scale.
  • Search engine penalties: Search engines like Google can penalize sites with duplicate or auto-generated content.
  • Legal compliance: Using AI to generate infringing copyrighted work has legal consequences.
  • Ethical concerns: Many view passing off AI content as your own unethical, even if not illegal.

The stakes are high, and the technology has advanced quickly. Let’s look at tools that can detect this new type of plagiarism.

Comparing Top ChatGPT Plagiarism Checkers

Here are leading free plagiarism checkers that flag AI-generated text from ChatGPT and similar language models:


Launched in response to ChatGPT, GPTZero is specifically designed to detect AI-written text. It analyzes linguistic patterns to identify content not created by a human.

GPTZero can check content directly or integrate via API/Chrome extension. It provides detailed similarity reports and sources. The free plan has limited checks but is helpful for basic AI detection.


Quetext has added AI plagiarism detection to its robust similarity checker for students and professionals. It scans for text modeled from ChatGPT and other sources.

Quetext offers a free plan with 10 monthly checks. The paid plans provide more checks, custom reports, and plagiarism research tools.


Bibblio is a capable online plagiarism checker with AI detection capabilities. It checks against ChatGPT and flags text written in its conversational style.

The free version allows unlimited checks up to 500 words each. Bibblio also has Chrome and Office extensions.


PaperRater has an AI detector that analyzes linguistic patterns to uncover content generated by ChatGPT and similar language models. Its cloud-based software helps maintain integrity in academic and corporate environments.

It offers a basic free plan. The paid plans unlock more advanced tools including AI detection.


Copyleaks provides an AI plagiarism checker that scans for ChatGPT and other language model content. It works across many document types and has a bulk scanning option.

The free plan includes 50 pages a month. Premium plans enable higher volumes plus customized similarity reports.


The free SmallSeotools plagiarism checker compares text to ChatGPT responses to identify AI-generated content. It also checks against common web sources.

While basic, it’s handy for quick plagiarism scans if you just want to spot check something against ChatGPT.


Popular writing assistant tool Grammarly has started integrating AI text detection into its premium plans. This alerts users if the writing style matches common language models.

The free version focuses on grammar and spelling. But premium Grammarly can flag potential AI plagiarism during the writing process.

What To Look For in an AI Plagiarism Checker

When evaluating tools, here are key criteria to ensure effective AI detection:

  • Specialized AI models – Purpose-built systems like GPTZero outperform generic checkers.
  • Multiple sources – Check against ChatGPT but also other language models like Claude, Anthropic’s research model.
  • Style analysis – Look for tools that identify linguistic patterns typical of AI-generated text.
  • Similarity reporting – Quantify the percentage of text that matches AI systems.
  • API access – Programmatically integrate detection into existing tools and workflows.
  • Bulk scanning – Scan high volumes of documents for maximum integrity.

Prioritize plagiarism checkers designed specifically to uncover AI content instead of just checking against public web sources.

Best Practices for Using AI Plagiarism Checkers

To leverage these tools most effectively, keep these tips in mind:

  • Use multiple checkers for more robust detection. Each has strengths and weaknesses.
  • Integrate into writing and submission workflows when possible via extensions and API.
  • For students, run assignments before submission to give a chance to correct issues.
  • Adjust similarity thresholds lower for strict checking or higher to allow some paraphrasing.
  • Understand limitations – advanced AI can sometimes fool detectors temporarily.
  • Update tools frequently as AI detection models continue advancing rapidly.
  • Combine with policies that align incentives, like requiring source citations.

Routinely running content through quality AI plagiarism checkers mitigates risks and maintains integrity.

The Future of AI Plagiarism Detection

As AI content generation explodes in popularity, detection technology will rapidly evolve:

  • Improved accuracy through adversarial training approaches against the latest AI capabilities.
  • Custom models trained on domain-specific data sets like academic papers or news content.
  • Crowd-sourced detection by allowing users to flag suspicious content which trains models.
  • Native solutions offered by AI providers like Anthropic and OpenAI to maintain trust.
  • Multi-modal sensing using indicators beyond just text such as metadata, audio, images and video.

The technology race between generative AI and detective AI has just begun. Maintaining information quality and provenance will only grow more critical.


ChatGPT has triggered revolutionary progress in AI content creation. But with great power comes great responsibility. AI plagiarism checkers give us the tools to benefit from generative models while maintaining ethical standards.

Implementing controls like routine plagiarism scanning, citations, and transparency builds trust. As both humans and AI advance together, we can catalyze creativity instead of conflict.

FAQs About ChatGPT Plagiarism Checking

Is ChatGPT plagiarism illegal?

Passing off auto-generated text as your own original work is typically considered unethical plagiarism, though not explicitly illegal in most cases currently. However, it does violate academic integrity policies.

How accurate are current AI plagiarism detectors?

Early accuracy rates are good, typically 95%+ for ChatGPT. But advanced AI can sometimes evade detection through paraphrasing, so results should be interpreted carefully.

Can AI plagiarism checkers detect images and code?

Currently most focus on text content, but AI can also generate images, code, audio and more. Detecting different content types requires specialized algorithms.

What happens if AI plagiarism is identified?

Consequences depend on the environment – academic integrity violations can result in failing grades, while publishers may blacklist contributors. Legal penalties may apply for copyright infringement.

Will AI detection cause false positives on human-written text?

Properly calibrated checkers have low false positive rates, but it’s possible. Human review, multiple checkers, and appealing incorrectly flagged work reduces this risk.

How fast do these detectors update to identify new AI models?

The most advanced systems update continuously based on adversarial training and crowd-sourced data as new generative models emerge.

Can language models create plagiarism-free content?

In theory advanced AI could minimize self-duplication and paraphrase sources to evade detectors. But human oversight and ethics policies prevent abuse.

Will AI plagiarism eventually be impossible to detect?

It’s unlikely as detective AI evolves too, but generative models are rapidly advancing so it will be a persistent cat-and-mouse game requiring continuous innovation.

Should schools update policies to penalize AI plagiarism?

Most educators agree formal policies should address AI plagiarism explicitly as technology evolves, with consistent penalties and an educational approach.

Hopefully these AI plagiarism detection and prevention insights prove useful! Let me know if you have any other questions.

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