Paste
Use drafts, replies, or page copy.
AI text checker
AI text checker with clear reasons
Paste writing and get AI probability, human score, generic-writing score, key reasons, and highlights.
Result
Waiting
01
AI probability
02
Human-like cues
03
Calibration
Context only.
AI probability is an estimate to help you review content. It is not proof that someone did or did not use AI.
Check
The checker looks for measurable writing patterns.
Review
Use the score to ask for context or edits.
Questions
How much text should I paste?+
Aim for at least 80 words when possible. Short samples can run with lower confidence.
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.
More tools
AI detectorPaste text and get AI probability with reasons.Free checkerText and image checks.PricingFree and Pro AI checking plans.Image checkerUpload an image for metadata review.Social account checkerReview suspicious social accounts privately.Public social intelligenceBrowse masked public-interest account review aids.Essay checkerReview academic drafts carefully.Generic writing checkerFind generic writing patterns.