AI lip sync uses neural networks to analyze an audio track and generate corresponding mouth movements on a video of a person. The AI maps phonemes (speech sounds) to visemes (mouth shapes) and modifies the video frames to match. It preserves the original facial identity, expressions, and head movement while only changing the mouth region. The result is a video where the person appears to naturally speak the provided audio.

AI lip sync has many creative and practical applications: dubbing videos into different languages while matching lip movements, creating talking-head content from a single photo and audio recording, producing educational and training videos, making personalized greetings and messages, synchronizing voiceover narration with existing footage, and creating content for presentations and social media without filming new video.

For video input, we support MP4, MOV, and WebM formats. For audio, MP3, WAV, and M4A are accepted. The video should clearly show the person's face, ideally front-facing with good lighting. Audio should be clear speech without heavy background noise or music. Maximum video duration depends on your plan and credits available. Output is delivered as MP4 with the synced audio embedded.

Modern AI lip sync produces highly convincing results when the input video and audio are of good quality. The mouth movements closely match the speech sounds, and the blending with the rest of the face is seamless. Result quality depends on video resolution, lighting, face visibility, and audio clarity. Front-facing videos with clear speech produce the most natural-looking results. Side profiles or extreme angles reduce accuracy.

Yes, AI lip sync is language-agnostic — it works with any spoken language because it maps audio waveforms to mouth shapes rather than understanding the language itself. The AI recognizes speech patterns and phonetic sounds universally. This means you can use it for Russian, Spanish, Chinese, Arabic, Hindi, and any other language. It even works with singing and non-verbal vocalizations to some degree.

The ideal source video has: a clearly visible face (front-facing or at a slight angle), good and even lighting without harsh shadows on the face, stable camera with minimal shaking, resolution of at least 480p, and the mouth area clearly visible without obstructions. Avoid videos where the face is frequently turning away, covered by hands, or poorly lit. Videos with existing speech work well — the AI replaces the mouth movements with new ones matching your audio.

Technically, the AI can process any video containing a visible face. However, using lip sync to create misleading content that impersonates real people is against our terms of service and may violate laws in your jurisdiction. Acceptable use cases include educational content, parody, artistic projects, and clearly labeled entertainment. Always disclose that AI-generated lip sync was used and ensure your content does not deceive viewers about its authenticity.

Processing time depends on video duration, resolution, and server load. A 10-second clip typically takes 30–90 seconds to process. Longer videos take proportionally more time. Premium plans include priority processing for faster results during busy periods. You will see a progress indicator during processing and can continue using other tools while waiting. A notification appears when your lip-synced video is ready to download.