How to Spot a Deepfake
Updated July 1, 2026 · 7 min read
A deepfake swaps or synthesizes a real person's face — and often their voice — onto video or images. As the tech improves the obvious tells are fading, but there are still reliable ways to catch one. Here's what to look for.
Fastest check: check the mouth, blinking, lighting, and edges, then verify with a reverse image search — and run any still frame through an AI image detector.
Check an image now →1. Watch the mouth and lip-sync
Lip movement in a deepfake often drifts slightly out of sync with the audio. Pay attention to hard consonants — "p," "b," "m" — which need the lips to fully close. If they don't, that's a strong tell.
2. Blinking and eyes
Deepfakes struggle with natural blinking — too slow, too frequent, or oddly timed. Eyes can also look glassy or unfocused, with mismatched or blurry reflections.
3. Lighting and shadows that don't match
One of the biggest giveaways: a brightly-lit face against a background that should put it in shadow, or shadows falling in different directions. Deepfakes graft a face onto a scene without matching the light.
4. Head motion, neck, and edges
Look for a head that turns stiffly or seems to "float" apart from the shoulders, a neck that blurs or thins when the person moves, and a flickering or blurry boundary where the swapped face meets the rest of the head.
5. A neglected background
Creators focus on the face, so the background is often an afterthought — flickering objects, warped lines, or textures that distort when the subject moves.
6. Audio tells
Synthetic voices lack natural imperfections — subtle pitch changes, breathing, emotional emphasis. Listen for a flat, even tone, awkward pauses, or strange pacing.
7. Ask whether it makes sense
Sometimes the biggest clue isn't in the pixels. Would this person realistically say or do this, here, now? Deepfakes are often deployed in implausible, high-stakes, or urgent scenarios designed to make you react before you think.
8. Verify with tools
Run a reverse image search (Google Images, TinEye) to find the original — you may discover an earlier, unaltered version. For a still image or a captured video frame, an AI image detector can flag signs of synthesis. See also how to tell if an image is AI-generated and our impersonation detection use case.
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Try the free AI Image DetectorFrequently asked questions
What's the difference between a deepfake and an AI-generated image?
A deepfake manipulates or swaps a real person's likeness (usually in video), while an AI-generated image is created from scratch by a generator. Both can be checked for signs of AI synthesis.
Can you always spot a deepfake?
No — the best deepfakes are very convincing. Combine visual and audio checks with context and verification tools rather than relying on any single clue.
Can an AI detector check a deepfake?
For still images and captured video frames, an AI image detector can flag signs of synthesis. For video, extract a few clear frames and check those.