Browser sampling
H.264 MP4 and WebM work most reliably; short clips use fewer frames and longer clips use up to five.
Sampled-frame video checker
Check frames.
Not motion.
The browser samples up to five representative frames and submits those images for an aggregate warning signal. The original video stays in the browser.
Open the free checkerScope before score.
Every result is a warning signal. The evidence and limitations below define what this route can and cannot support.
Aggregate only
The API reports frame count, scored, pending and failed frames plus median, mean and maximum scores.
Existing evidence
Video is judged on 15 sampled frames, at least 3 of which must score strongly: 82.6% caught (62.9-93.0%) on 23 videos at 1.4% false warnings. That interval is wide because the set is small. Sampled video says nothing about motion, lip-sync, or the moments between sampled frames.
Do not infer more than the lane measured.
- This is not temporal deepfake analysis.
- It does not evaluate lip-sync, motion continuity or audio-video consistency.
- Unsampled moments can contain signals the checker never sees.