AI Text Detector
FREECheck whether text was written by AI in seconds — right in your browser. This free AI text detector analyzes writing for patterns common to AI-generated content from tools like ChatGPT, Gemini, and Claude, then gives you a probability score showing how likely it is to be AI-written versus human-written. Paste your text and get an instant result. It's useful for educators, editors, and anyone verifying content authenticity — best used as a guide alongside your own judgment, since no detector is perfect. No signup, no limits.
About AI Text Detection
AI text detection uses statistical analysis to estimate whether writing was generated by a language model. It looks at signals like perplexity (how predictable the word choices are) and burstiness (how much sentence length and structure vary), since AI text often reads more uniformly than human writing. These are probabilistic signals, not proof — human writing can look "AI-like" and skilled edits can make AI text look human. Detectors are known to produce false positives, so results are best read as guidance rather than certainty. We built this tool to offer a fast, free first-pass check you can pair with your own judgment.
How to Check if Text Is AI-Generated
How to Check if Text Is AI-Generated
Common Mistakes to Avoid
❌ Treating the score as proof
✓ Solution:
No AI text detector is fully accurate, and both false positives and false negatives happen. Read the probability as a signal, not a verdict. For anything consequential, gather more evidence before drawing a conclusion.
❌ Penalizing someone on a detector result alone
✓ Solution:
Acting on a score without context — especially in academic or work settings — can wrongly accuse a real writer. Use the result to start a conversation or a closer review, never as sole proof of wrongdoing.
❌ Ignoring bias against non-native writers
✓ Solution:
Detectors often flag simpler, more uniform English — common among non-native speakers — as AI. Be aware of this bias and don't assume a high score means dishonesty, particularly for writers whose first language isn't English.
❌ Checking text that's too short
✓ Solution:
Very short passages don't give the detector enough to analyze, making results unreliable. Provide a longer sample where possible so the score has more signal to work from.
❌ Assuming AI-edited and fully AI-written are the same
✓ Solution:
Human writing lightly polished by AI is different from text generated entirely by a model, and mixed content often lands in the middle. Consider that part of the text, not all of it, may be AI-assisted.
Frequently Asked Questions
How accurate is the AI text detector?
It's designed to flag text from popular models like ChatGPT, Gemini, and Claude, as well as AI-assisted writing. Because it analyzes general language patterns rather than a single tool's signature, it can also flag content from other models it wasn't specifically tuned for.
Yes. False positives are a known limitation, and simpler or more uniform writing — often from non-native English speakers — can be misclassified as AI. This is why the result should be treated as guidance, not proof, and never used to accuse someone on its own.
Check a longer passage rather than a short snippet, since more text gives the detector more to analyze. Then read the score alongside context — what you know about the writer, the assignment, and the situation — instead of relying on the number by itself.
Your text is used only to run the analysis and isn't shared. It's processed to generate your result and not kept afterward, so you can check content with confidence.
AI Text Detector — Free Online Tool to Check if Text Is AI-Generated or Human-Written (ChatGPT, Gemini & More)
An AI text detector that helps you judge whether writing was produced by a human or an AI model. Paste your text and the tool analyzes signals often found in AI-generated content — such as unusually even sentence structure and predictable word patterns — then returns a probability score rather than a flat yes or no. It's designed to flag output from popular models like ChatGPT, Gemini, and Claude, along with AI-assisted writing. Because language models are improving quickly and human writing varies widely, no detector is fully reliable: results should be treated as an indication to look closer, not as proof. This is especially important because detectors can wrongly flag genuine human writing, particularly from non-native English speakers. Use it as one signal among several — combined with context, your knowledge of the writer, and your own reading. It's free, needs no account, and returns results in seconds, making it a helpful first-pass check for teachers, editors, publishers, and content reviewers.
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