ByteDance LatentSync

Sync audio to video with realistic lip movements

"Sync this audio with the video"

Input Video

@Video1

Generated Video

Generated

Upload your video and sync lips in seconds

10,000+ generations this month

📄 About ByteDance LatentSync

ByteDance LatentSync is a cutting-edge AI model engineered to deliver high-quality, frame-accurate lip sync animations by seamlessly synchronizing any audio file with video content. Powered by advanced diffusion modeling, LatentSync analyzes both the phonetic characteristics of an audio track and the intricate facial dynamics present in a video, enabling it to generate natural, visually compelling mouth movements that perfectly match the provided audio—even when the original video and audio are mismatched. Designed for maximum accessibility, ByteDance LatentSync supports both video and audio files up to 30 seconds and 100MB each, accommodating a wide variety of content types from social media clips to professional video productions. Users can upload files directly or provide URLs, streamlining the workflow for creators, agencies, and studios alike. Once the files are submitted, LatentSync’s intelligent AI processes the inputs and produces a new, high-fidelity video with expertly synchronized lip movements in as little as 30-60 seconds. At the core of LatentSync is its state-of-the-art diffusion model, which excels at phoneme-to-visual alignment. This ensures that lip movements in the rendered video are in precise harmony with the nuances of the audio, resulting in ultra-realistic and engaging lip sync animations. This technology is especially valuable for dubbing videos into multiple languages, producing virtual avatars or Vtubers, enhancing animated or VFX-driven content, and localizing educational or marketing materials for global audiences. LatentSync’s versatility makes it an invaluable tool for a broad spectrum of creative professionals. Content creators and filmmakers can use it to localize videos without costly reshoots, while animators and game developers can bring characters to life with accurate voiceover synchronization. Marketers and educators benefit from the ability to quickly personalize videos or update training materials with new audio tracks, ensuring content remains fresh and relevant for diverse audiences. The platform’s user-friendly interface and flexible input options support efficient integration into existing creative pipelines, whether you’re an individual freelancer or part of a large production team. In addition to its technical prowess, ByteDance LatentSync offers a highly scalable and cost-effective solution for teams of any size. Its rapid processing times accelerate post-production workflows and enable creative experimentation without long delays. By leveraging AI-powered diffusion modeling, LatentSync sets a new industry standard for accuracy and creative flexibility in the field of lip sync animation, making it easier than ever to achieve professional-grade results in record time. Whether you’re dubbing content for international markets, animating characters for games, producing personalized video ads, or revitalizing archival footage with new audio, ByteDance LatentSync empowers you to create engaging, perfectly synchronized videos with minimal effort. With its blend of advanced AI, user-centric design, and broad compatibility, LatentSync is an essential addition to any modern content creation toolkit.

✨ Key Features

AI-driven lip sync animation using advanced diffusion models for lifelike, frame-accurate results.

Supports video and audio files up to 30 seconds and 100MB each, accommodating a wide range of content.

Fast processing speeds, generating synchronized videos in approximately 30-60 seconds.

Accepts both file uploads and direct URLs for seamless workflow integration.

Phoneme-to-visual alignment ensures natural, expressive mouth movements with any audio track.

Flexible and scalable for both individual creators and large production teams.

User-friendly interface designed for efficient, hassle-free operation.

💡 Use Cases

⚡Dubbing and localizing videos into different languages for international audiences.

⚡Syncing voiceovers with animated characters, avatars, or Vtubers in entertainment content.

⚡Producing personalized marketing, explainer, or training videos with custom audio.

⚡Enhancing educational materials with accurate narration or translations.

⚡Revitalizing archival or legacy footage with new, high-quality audio tracks.

⚡Improving accessibility by adding synchronized voiceovers or subtitles.

⚡Streamlining animation and VFX workflows with automated lip sync generation.

🎯 Best For

🎯 Video creators, animators, marketers, educators, and production teams seeking fast, high-fidelity lip sync solutions.

👍 Pros

✓Delivers highly realistic and natural lip sync animations using state-of-the-art AI.

✓Rapid output generation accelerates creative and post-production workflows.

✓Supports a broad variety of video and audio formats with generous file size limits.

✓Simple, intuitive interface with flexible input options for files and URLs.

✓Adaptable for both short-form content and professional video projects.

✓Cost-effective and scalable for individuals and organizations alike.

⚠️ Considerations

△Limited to video and audio clips up to 30 seconds and 100MB each.

△Requires clear, high-quality video input for optimal lip sync accuracy.

△Performance may be affected by poor audio or video quality.

△Not suitable for real-time or live streaming applications.

📚 How to Use ByteDance LatentSync

Prepare your video and audio files, ensuring each is no longer than 30 seconds and under 100MB.

Access the ByteDance LatentSync platform or your chosen integration interface.

Upload your video file or paste the video URL as prompted.

Upload your desired audio file or provide the audio URL for synchronization.

Start the processing and wait around 30-60 seconds for the model to generate the synced video.

Download and review the output, making adjustments as needed for your project.

💡 Pro Tips for ByteDance LatentSync

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Optimize Video Framing for Best Results Ensure the subject's face occupies at least 30-40% of the frame and remains clearly visible throughout the clip. Avoid rapid camera movements, quick cuts, or extreme angles that obscure facial features. Stable, well-lit footage with the subject facing the camera directly yields the most accurate lip sync. If your source video has challenging framing, consider using Kling AI Avatar v2 Standard to generate a fresh talking-head video from scratch.

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Use High-Quality Audio for Natural Sync Clean, noise-free audio with clear phonetic articulation produces the best lip sync accuracy. Record in a quiet environment and use a decent microphone to capture crisp voiceovers. Avoid heavy background music or ambient noise during speech, as these can confuse the phoneme detection. For projects requiring more control over avatar speech and emotion, Sync Lipsync v2 Pro offers advanced tuning options that complement LatentSync's fast processing.

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Match Audio and Video Duration Closely While LatentSync can handle slight timing differences, aligning your audio length closely with your video duration minimizes artifacts and ensures smooth synchronization. Pre-edit your clips so the speech fits naturally within the video's runtime. If you need to extend or loop video content to match longer audio, consider generating additional frames with Ovi Image-to-Video before syncing.

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Test Different Lighting and Angles First Experiment with a few short test clips under varied lighting conditions and camera angles to identify what works best for your specific content style. LatentSync performs optimally with even, frontal lighting that clearly defines facial contours. Once you identify the ideal setup, batch-process similar clips for consistent results across your project.

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Combine with Avatar Tools for Full Control If you're creating entirely synthetic characters or need precise control over expressions and gestures, pair LatentSync with avatar generation models. Start by creating a base talking-head video using Kling AI Avatar Pro or Stable Avatar, then refine the lip sync with LatentSync for polished, production-ready output.

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Keep File Sizes Under Limits for Faster Processing Compress your video and audio files to stay comfortably below the 100MB limit without sacrificing quality. Use modern codecs like H.264 for video and AAC for audio to maintain clarity while reducing file size. Smaller files process faster and reduce upload times, letting you iterate quickly during creative workflows.

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Frequently Asked Questions

LatentSync supports most common video and audio formats. Each file should be no longer than 30 seconds and must not exceed 100MB in size. Both direct uploads and URLs are accepted for convenience.

Typically, LatentSync processes and generates a synchronized video within 30-60 seconds. This rapid turnaround helps speed up content creation and post-production workflows.

Yes, to ensure efficiency and optimal performance, both video and audio files are limited to a maximum of 30 seconds in length and 100MB in size.

Absolutely. LatentSync is ideal for dubbing, allowing you to sync translated audio tracks or voiceovers with existing video content, making it perfect for multilingual projects.

Pricing varies by model and is based on a pay-as-you-go credit system, making it flexible and accessible for all project sizes without long-term commitments.

Credit costs on JAI Portal vary by model and processing complexity. ByteDance LatentSync typically charges per video generation, with pricing visible on the model page before you run the job. Because LatentSync processes quickly (30-60 seconds per clip), it's a cost-effective choice for high-volume dubbing or localization projects. For detailed credit breakdowns and to compare costs with alternatives like Sync Lipsync v2 Pro or Kling AI Avatar Standard, visit the model pages directly. JAI Portal's pay-as-you-go system means you only pay for what you use, with no subscription required.

Yes, all paid output generated on JAI Portal—including videos created with ByteDance LatentSync—comes with full commercial-use rights. You can use synced videos in advertisements, client projects, YouTube monetization, social media campaigns, and any other commercial application without additional licensing fees. This makes LatentSync ideal for agencies, freelancers, and businesses producing multilingual marketing content or localized training materials. Always ensure your input video and audio files have the necessary rights for commercial use, as JAI Portal's license applies only to the AI-generated output, not the source material.

ByteDance LatentSync accepts most common video formats, including MP4, MOV, AVI, and WebM, as long as each file is under 30 seconds and 100MB. The model preserves the original resolution of your input video during processing, so uploading high-definition (1080p or higher) footage yields HD output. For best results, use progressive scan video with a frame rate of 24-30 fps. If you need to upscale or reformat output for specific platforms, consider post-processing with standard video editing tools or pairing LatentSync with other JAI Portal models like VEED Fabric 1.0 for additional editing capabilities.

JAI Portal offers API access for many models, enabling batch processing and integration into automated workflows. If you need to sync dozens or hundreds of videos at scale—such as for multilingual content localization or large marketing campaigns—check the JAI Portal API documentation or contact support to confirm LatentSync's API availability and rate limits. Batch processing via API can significantly accelerate production timelines and reduce manual upload overhead. For single or small-batch jobs, the web interface remains the fastest and most user-friendly option.

Unnatural or misaligned lip sync usually stems from poor input quality. First, verify that your video has clear, well-lit facial visibility and that the audio is clean with minimal background noise. Ensure the subject's face remains stable and forward-facing throughout the clip. If issues persist, try trimming the video to focus on the most stable segments, or re-record the audio with better enunciation. For more advanced control over lip sync tuning and facial expressions, consider testing Sync Lipsync v2 Pro or generating a new base video with Bytedance Omnihuman v1.5 before syncing.

⚖️ How ByteDance LatentSync Compares

ByteDance LatentSync excels at fast, accurate lip sync for existing video footage, making it the go-to choice when you already have high-quality video and need to swap or localize audio quickly. Its 30-60 second processing time and support for up to 30-second clips make it ideal for short-form content, social media dubbing, and rapid iteration. If you're creating talking-head videos from scratch or need more control over avatar appearance and expressions, Kling AI Avatar v2 Standard or Kling AI Avatar Pro generate full synthetic avatars with built-in lip sync, though they take longer and cost more per generation. For projects requiring advanced tuning of phoneme timing or emotional nuance, Sync Lipsync v2 Pro offers deeper customization at a higher complexity level. If you need to animate still images or create longer video sequences before syncing audio, pair LatentSync with Ovi Image-to-Video or Bytedance Omnihuman v1.5 for a complete production pipeline. Choose LatentSync when speed, simplicity, and cost-efficiency matter most for dubbing or localizing real footage. Explore JAI Portal's side-by-side comparison tool or sign up at /auth/signup to test multiple models and find the perfect fit for your workflow.