AI lip sync — natural mouth movement in any language
DubSync re-renders the speaker's mouth movements to match the dubbed audio perfectly. The result is a video that looks like it was originally recorded in the target language.
How lip sync works
Detect facial landmarks
The AI maps the speaker's face in every frame, identifying the mouth, jaw, and surrounding facial muscles with sub-pixel precision.
Analyze dubbed audio phonemes
The translated speech is broken down into individual phonemes. Each phoneme maps to a specific mouth shape (viseme) that the model knows how to render.
Re-render mouth movements
The video is re-composited frame by frame, adjusting the mouth region to match the new audio. Skin texture, lighting, and shadows are preserved for a seamless result.
Why lip sync matters
Audio-only dubbing leaves a gap between what viewers hear and what they see. Lip sync closes that gap completely.
Viewer trust
Mismatched lip movements are immediately noticeable and make viewers question content quality. Proper lip sync keeps audiences engaged and builds credibility.
Higher retention
Videos with synchronized lip movements hold viewer attention longer. Studies show dubbed videos with lip sync have 35% higher completion rates than those without.
Platform performance
YouTube, TikTok, and Instagram algorithms favor videos with strong watch time. Lip-synced dubs reduce drop-off and improve algorithmic reach in every market.
Supported content types
Talking-head videos
YouTube vlogs, course lectures, and podcast clips where the speaker's face is front and center. Lip sync is critical here because the mouth is the focal point.
Presentations & webinars
Speaker-led content with slides. DubSync detects when the speaker is on screen and applies lip sync only to those segments, leaving slide-only sections untouched.
Short-form social content
TikToks, Reels, and Shorts where viewer attention is fleeting. Even a single frame of mismatched lips can trigger a scroll. Lip sync keeps the illusion intact.
Interview & multi-cam footage
Content with multiple speakers and camera angles. DubSync tracks each speaker independently and applies lip sync to whoever is currently speaking.
Make dubbed videos look native
Try lip sync with 5 free minutes of dubbing. No credit card required.
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