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Create frame-accurate AI lip sync videos from any video + audio in seconds, with 40+ languages, multi-speaker detection, and up to 4K export.
Bad lip sync ruins dubbed videos: mouths drift off timing, eyes go frozen, and fixing it by hand or with ADR can cost hundreds to thousands per project. Lip Sync AI focuses on one job: take your video (or a portrait photo) plus an audio track and generate mouth movement that matches speech timing closely enough for real production work.
Lip Sync AI is a web-based AI lip sync video generator for voice-to-mouth synchronization, multilingual dubbing, and talking avatar creation. You upload a source video and a new audio track (or a headshot photo + audio), choose settings like target language and multi-speaker detection, preview the sync, then export a new video with updated mouth movement.
The site positions it for video dubbing, multilingual localization, and “talking avatar” presenters, with a specific emphasis on preserving the original performance rather than reanimating a flat face.
Lip Sync AI analyzes the audio waveform, extracts phonetic timing (phonemes), and maps those sounds to mouth shapes “frame-accurately.” The product highlights phoneme-level precision and claims 98%+ phoneme alignment accuracy, plus sub-frame synchronization for tighter timing than basic frame-based methods.
A common failure mode of lip-sync tools is the “dead-eyed” look, where the mouth is animated but the rest of the face becomes rigid. Lip Sync AI says it processes upper and lower facial regions separately to keep eyebrow movement, eye motion, and head tilts intact, and claims it keeps 97% of the original performance.
For localization, you can replace the original dialogue with translated audio and re-sync lips to the new language. The site states support for 40+ languages (examples include English, Spanish, Mandarin, French, German, Japanese, Korean, Portuguese, Arabic, and Hindi) using native phoneme models to keep mouth shapes believable for each language.
For interviews, dialogue scenes, or group clips, Lip Sync AI includes multi-speaker detection (also described as active speaker detection/character identification). It identifies and tracks multiple speakers so each face gets its own lip-sync processing.
If you do not have video footage, you can upload a portrait photo and an audio track to generate a talking-head video. The page describes added head motion, micro-expressions, blinks, and gaze behavior, which is useful for presenter-style content.
Lip Sync AI offers a free plan and paid subscriptions. The FAQ states 30 free credits on signup (no credit card required) and that paid plans start at $19.9/month. The pricing section on the page also shows a Free tier and an annual Basic plan displayed as $13.3/month billed at $159.9/year, with a 7-day money-back guarantee.
The pricing page lists free-tier constraints such as 720p output only, watermarked videos, and public generation only. Credit costs vary by output quality (the FAQ notes standard lip sync at 1 credit; high-quality at 2–3 credits), and the built-in generator UI shows a short-form workflow (audio upload UI indicates a max 15s clip for that interface).
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