How to Spot AI Text with the Is This AI? Checker

The Is This AI? text checker helps writers, students and editors quickly gauge whether a passage was likely produced by artificial intelligence. Paste any block of text into the tool and it instantly runs a series of heuristic tests directly in your browser. There is no upload or logging, so you can safely check private drafts without worrying about third‑party storage.

Why AI Text Detection Matters

Generative models such as ChatGPT and Claude have made it effortless to produce polished paragraphs in seconds. That convenience comes with new challenges: educators need to confirm that assignments are original, publishers worry about AI‑generated spam, and companies want to verify that branded content still reflects a human voice. Recent studies highlight how AI text can evade traditional plagiarism detectors, making purpose‑built analysis tools increasingly important.¹

Understanding the Metrics

The checker does more than spit out a single “AI or not” verdict. It explains its reasoning through three complementary metrics.

Burstiness

Burstiness looks at sentence length variation. Human writing tends to flow with a mix of short and long sentences, while many models output more consistent patterns. A paragraph like:

The rain stopped. Sunlight pierced the clouds. People left their shelters, smiling.

shows natural variation. Compare that with an AI‑generated snippet:

The weather improved and the atmosphere brightened as individuals emerged from cover.

The second example is smoother but less varied. High burstiness implies a human touch, while low burstiness signals uniform sentence structure.

Repetition

Repetition measures how often phrases or n‑grams recur. Language models sometimes reuse the same construction several times in a row, especially in longer pieces. Excessive repetition can be a hint that the text was generated automatically.

Entropy

Entropy calculates how predictable the next word is, based on probability distribution. Human writers inject surprising turns of phrase; models, particularly when prompted to be factual or concise, often stick to high‑probability words. Lower entropy suggests the text follows common patterns, nudging the confidence score toward “likely AI.”

Step‑by‑Step: Using the Is This AI? Checker

1. Open the tool. Visit the Is This AI? text checker.
2. Paste or type your text. The analysis works best on passages of at least 150–200 words. Longer samples give the metrics more data to work with.
3. Click “Analyse.” The checker processes everything locally in a second or two.
4. Review the verdict. You’ll see a confidence rating alongside burstiness, repetition and entropy explanations.
5. Iterate if needed. Try different sections of a document or run the tool on individual paragraphs to see how the scores change.

Real‑World Use Cases

Teachers and Students

Educators can quickly scan essays to flag passages that warrant a conversation. Rather than acting as judge and jury, the tool offers a starting point for discussions about academic integrity.

Editors and Publishers

Guest posts, sponsored content or outsourced articles can be checked before publication. If a submission appears heavily machine‑written, editors can request revisions or verify that sources are properly cited.

Businesses and Freelancers

Marketing agencies or freelance writers often juggle multiple contributors. Running content through the checker ensures it meets a client’s expectation for authentic, human‑sounding copy.

Personal Curiosity

Sometimes you just want to know if a viral tweet or comment thread was crafted by a bot. The tool’s low‑friction design lets you test snippets without signing up or uploading files.

Limitations and Responsible Use

No AI detector is infallible. OpenAI itself acknowledges that reliably spotting machine‑generated text remains an unsolved problem and advises caution when interpreting automated scores.² The metrics used here are heuristics—they point to patterns but do not provide definitive proof. Human writers can mimic machine traits, and models can be prompted to write with higher variability. Always pair detection results with context and critical judgment.

Tips for Better Accuracy

• Use longer samples. Very short paragraphs don’t provide enough data for meaningful analysis.
• Remove formatting artifacts. Copying from PDFs or webpages can introduce line breaks or hidden characters that skew results.
• Combine with plagiarism checks. While the checker evaluates style, traditional plagiarism tools can reveal whether the text was lifted from elsewhere.

How It Compares to Other Detectors

Cloud services like GPTZero and Originality.ai analyze text on remote servers and often charge per document. Those platforms may integrate with learning management systems or offer bulk scanning for enterprises. Our checker runs entirely in your browser, so sensitive drafts never leave your device and there are no usage limits. It focuses on transparency and privacy rather than enterprise features.

Related Tools on Infinite Curios

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Conclusion and Next Steps

The Is This AI? checker offers a practical way to interpret the authenticity of text without sacrificing privacy. By explaining burstiness, repetition and entropy, it demystifies the detection process and gives you evidence to support follow‑up conversations. Give it a try the next time you receive a suspicious paragraph or want to double‑check your own work before submitting it.

Call to action: Visit the Is This AI? text checker and run your latest draft. Share feedback or feature requests on GitHub to help us improve the tool.

Why Trust This Content?

Adam Johnston is the creator of Infinite Curios and has years of experience experimenting with AI tools for content creation and analysis. Guides on the site are tested in real workflows and updated as technology evolves.