> ## Documentation Index
> Fetch the complete documentation index at: https://docs.wrldwide.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Lip Sync

> AI lip sync — synchronize any audio to any video face with Sync Labs, Standard, or Minimax

# Lip Sync

Synchronize any audio track to any video with AI-powered lip sync. Upload a video with a visible face and an audio file — the model animates the mouth and facial movements to match the audio.

**Credit Cost:** 8–12 credits (model-dependent)\
**Access:** [app.wrldwide.ai/lip-sync](https://app.wrldwide.ai/lip-sync)

***

## Models

### Sync Labs (Best) — 12 credits

**Highest quality lip sync with best accuracy**

* **Character:** Most natural facial movements, best audio-to-lip accuracy
* **Best for:** Professional content, talking head videos, brand spokespersons

***

### Standard — 8 credits

**Reliable lip sync at lower cost**

* **Character:** Good quality, reliable performance
* **Best for:** Most use cases, batch production, iterative testing

***

### Minimax — 10 credits

**Mid-tier quality with Minimax AI**

* **Character:** Natural motion, balanced quality/cost
* **Best for:** Content where Standard is insufficient but Sync Labs is overkill

***

## Sync Modes

Control what happens when the audio is longer or shorter than the video:

| Mode        | Behavior                                                          |
| ----------- | ----------------------------------------------------------------- |
| **Cut Off** | Video ends when audio finishes                                    |
| **Loop**    | Video loops seamlessly until audio finishes                       |
| **Bounce**  | Video plays forward then backward, repeating until audio finishes |

***

## How to Use

<Steps>
  <Step title="Open Lip Sync">
    Navigate to [app.wrldwide.ai/lip-sync](https://app.wrldwide.ai/lip-sync)
  </Step>

  <Step title="Select Model">
    Choose Sync Labs (best), Standard, or Minimax based on your quality/budget needs.
  </Step>

  <Step title="Upload Video">
    Upload the video containing the face you want to animate.

    **Requirements:**

    * Clear, well-lit face visible throughout
    * Face should be mostly forward-facing for best results
    * No heavy motion blur on the face
  </Step>

  <Step title="Upload Audio">
    Upload the audio file to sync to the face.

    **Supported formats:** MP3, WAV, M4A\
    **Tips:** Clear voice audio without excessive background noise yields the best results.
  </Step>

  <Step title="Select Sync Mode">
    Choose how to handle audio/video length mismatch: Cut Off, Loop, or Bounce.
  </Step>

  <Step title="Generate">
    Click **Generate**. Processing takes 1–3 minutes depending on video length and model.
  </Step>

  <Step title="Download">
    Preview the synchronized video and download. Review the lip sync accuracy and re-generate with a different model if needed.
  </Step>
</Steps>

***

## Key Features

<AccordionGroup>
  <Accordion title="Multi-Model Selection">
    Three models give you a quality vs. cost choice. Start with Standard for testing, then switch to Sync Labs for the final production version.
  </Accordion>

  <Accordion title="Flexible Sync Modes">
    The Loop and Bounce sync modes let you use shorter video clips with longer audio tracks — useful for testimonial-style ads where you have a long voice-over but a short video clip.
  </Accordion>

  <Accordion title="Audio Quality Matters">
    The cleaner and clearer the audio, the more accurate the lip sync. Studio-recorded voice-overs consistently outperform audio recorded in noisy environments.
  </Accordion>
</AccordionGroup>

***

## Use Cases

### Brand Spokesperson Localization

Record one actor speaking in English. Then use Lip Sync to match dubbed audio in Spanish, French, Japanese, etc. — without re-filming. The lip movements adapt to the new audio.

### UGC Ad Personalization

Generate a base talking avatar video, then lip-sync different voice-over scripts to the same video for A/B testing without re-generating the entire video.

### Testimonial-Style Ads

Animate any product photo or AI-generated character to deliver scripted testimonials with voice-over audio.

***

## Tips for Best Results

* **Video:** Use clips where the face is centered and lit clearly
* **Audio:** Use high-quality voice recordings (avoid phone recordings)
* **Length:** Match audio and video lengths when possible, use sync modes for mismatches
* **Model:** Use Sync Labs for professional outputs; Standard for iteration

***

## Next Steps

<CardGroup cols={2}>
  <Card title="Live Avatar" icon="circle-user" href="/en/features/live-avatar">
    Create talking avatars from photos
  </Card>

  <Card title="Face Swap" icon="user-circle" href="/en/features/face-swap">
    Replace faces in images and videos
  </Card>

  <Card title="UGC Video Ads" icon="users" href="/en/features/ugc-video-ads">
    AI-generated UGC style video ads
  </Card>

  <Card title="Localization" icon="globe" href="/en/features/localization">
    Adapt content for global markets
  </Card>
</CardGroup>