Lip Sync AI is a web-based video tool for creating natural-looking speaking videos from video, audio, and portrait images. It is designed for creators, educators, marketers, and localization teams who want to produce dubbed or voice-driven content without a complex editing workflow. Users can upload a source video and an audio track to generate synchronized mouth movements, or use a portrait photo to create a talking avatar. The platform also supports multilingual dubbing, allowing users to adapt content for different languages while keeping facial performance more consistent.