GPTZero
AI content detection tool built for educators
💎Freemium
🌐Web🧩Chrome⚡API
About
GPTZero is an AI detection tool specifically designed to help educators determine if submitted text was written by a human or an AI. By analyzing writing for patterns characteristic of large language models, it assists in upholding academic integrity and ensures students are submitting original work. It also allows students to verify their own writing for unintentional AI influence.
How to Use
- Go to gptzero.me — no account is required for basic checks. Create a free account to unlock history and batch scanning.
- Paste your text (up to 5,000 characters on the free plan) into the detection box, or upload a .doc, .docx, or .pdf file.
- Click 'Get Results'. GPTZero returns an overall likelihood score (Human, Mixed, or AI), a sentence-level heat map highlighting the most probable AI-generated passages, and separate 'perplexity' and 'burstiness' metrics.
- Review the heat map carefully — orange-highlighted sentences are statistically uniform (low perplexity), a pattern typical of LLM output. Use this to have a targeted conversation with a student rather than citing the overall score alone.
- For classrooms with high submission volume, upgrade to GPTZero Educator and use the batch upload feature to check multiple documents simultaneously and export a class-level summary CSV.
- Optionally enable the GPTZero Chrome extension to detect AI content inline while browsing student work in Google Docs, Canvas SpeedGrader, or any web-based text.
Available On
webchrome_extensionapi
✓ Pros
- •Free tier is genuinely useful — no account required for one-off checks, and the sentence-level heat map is available at no cost, giving educators actionable detail, not just a score.
- •Educator-focused design includes batch upload, class dashboards, and a dedicated API for LMS integrations, making it practical for high-volume classroom use.
- •Transparent methodology — GPTZero publishes its perplexity and burstiness metrics so educators understand what the score means rather than treating it as a black box.
- •Actively maintained with regular model updates targeting the latest GPT, Claude, and Gemini outputs, reducing the gap between new model releases and detection capability.
✗ Cons
- •Free tier caps text at 5,000 characters per scan; longer essays or multi-chapter work require a paid plan or must be split manually.
- •Like all AI detectors, GPTZero has a documented false-positive rate — non-native English writers and highly technical or formulaic text often produce inflated AI-likelihood scores.
- •The Chrome extension requires broad page permissions, which may be blocked by stricter institutional browser policies.
- •Pricing for the Educator plan scales by user seat, so large-department rollouts can become expensive compared to institutional Turnitin licences.
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Frequently Asked Questions
What do 'perplexity' and 'burstiness' mean in GPTZero results?▾
Perplexity measures how unpredictable the text is — human writers naturally vary word choice in ways that produce high perplexity, while LLMs tend toward statistically likely word sequences that produce low perplexity. Burstiness captures variation in sentence complexity: human prose alternates between short punchy sentences and long complex ones, whereas LLM output tends to be uniformly moderate in length. GPTZero flags text that scores low on both as likely AI-generated.
Can GPTZero detect content from Claude, Gemini, or Llama as well as ChatGPT?▾
GPTZero's models are trained to identify statistical patterns common across transformer-based LLMs, not just OpenAI's GPT series. In practice, accuracy varies by model version and writing style — it performs most reliably on unedited ChatGPT output and is generally good on Claude and Gemini, but accuracy drops when AI-generated text has been significantly paraphrased or manually edited.
How should educators use GPTZero results fairly?▾
GPTZero explicitly recommends using its output as a conversation starter, not a verdict. If a submission returns a high AI-likelihood score, the appropriate response is to ask the student to explain their writing process, review earlier drafts, or complete a brief oral defence — not to immediately refer the case for academic misconduct without further evidence.
Does GPTZero offer an API for LMS integration?▾
Yes. GPTZero provides a documented REST API available on the Educator and Enterprise plans. It accepts plain text or file uploads and returns perplexity scores, sentence-level classifications, and an overall verdict that can be ingested into Canvas, Blackboard, or custom workflows.
Topics & Tags
🌍Global👩🏫Teachers🎯Ethics & Detection📚General👨🎓Students🏛️Administrators🎯Assessment