
Sync.so Lipsync v3 API by Sync.so
Sync.so Lipsync v3 (sync-3) is Sync Labs state-of-the-art lip-sync model, re-syncing the lips of an existing video to a new audio track with industry-leading naturalness.
Sync.so Lipsync v3
Sync.so Lipsync v3 (sync-3) is Sync Labs' state-of-the-art lip-sync model. It re-syncs the lips of an existing video to a new audio track with industry-leading naturalness, preserving the speaker's identity and expression.
🌟 Key Features
👄 SOTA Lip Sync
The most natural lip-sync quality available — from the team behind Wav2Lip. Handles expressive speech and preserves facial identity.
🎚 Duration Mismatch Handling
sync_mode controls how video/audio length differences are resolved: cut_off, loop, bounce, silence, or remap.
🌍 Dubbing, Localization & Editing
Swap the voice or language of any talking video without reshooting.
💰 Duration-Based Billing
Billed per second of the driving audio (= output video duration).
⚙️ Parameters
| Parameter | Required | Description |
|---|---|---|
video_url* | ✅ | Input video whose lips will be re-synced. Public URL or Base64. Formats: mp4/mov/webm. |
audio_url* | ✅ | Driving audio to sync the lips to. Public URL or Base64. Formats: wav/mp3/m4a. |
sync_mode | ⬜ | Duration-mismatch handling: cut_off (default), loop, bounce, silence, remap. |
💲 Pricing
| Unit | Price |
|---|---|
| Per second (output video duration) | $0.20 / second |
🎯 Use Cases
- Premium Dubbing — Highest-fidelity lip-sync for professional localization.
- Film & Advertising — Re-voice actors or spokespeople with natural mouth motion.
- AI Avatars — Drive avatar videos with new speech at top quality.
- Multi-speaker Video — With active-speaker handling for scenes with several people.


















