Probability
Scores estimate likelihood. They are not proof.
Free AI checker
Free AI checker for text and images
Paste text or upload an image. Check AI probability, confidence, and the strongest reasons without accounts, payments, or saved uploads.
Result
Waiting
Run a check to see AI probability, confidence, key reasons, and next steps.
Preview
%
AI probability
AI vs human estimate
Human-like cues
Human-like context
Calibration
Confidence and next steps
Context only. Scores can help you review text, but they do not prove authorship or origin.
Result preview
Upload an image to estimate AI probability
The check returns probability, reasons, and metadata without claiming proof.
Preview
%
Probability
AI vs human estimate
Reasons
Key visual clues
Metadata
File facts as context
Context only. Scores can help you review images, but they do not prove authorship or origin.
AI probability is an estimate to help you review content. It is not proof that someone did or did not use AI.
Reasons
See what affected the result.
Privacy
Anonymous checks are not saved to your account. Sign in when you want saved history.
Questions
What can I check for free?+
Text and supported image files. Essay and slop pages use the same text checker with a different context.
Can this prove AI authorship?+
No. AI Checker Lab returns probability estimates to help you review content. It should not be used as proof or an accusation.
Does AI Checker Lab save my checks?+
Anonymous checks are not saved to an account. Signed-in users can save recent check history with a short preview, scores, and result details so they can review past results.
Why can AI checkers disagree?+
AI detection is uncertain. Different tools weigh style, length, topic, and evidence differently, so context matters.