Seedance Video Generator
ByteDance's Seedance is the first video generation model with native audio-visual synchronization — generating video and sound in a single pass. Run Seedance V1 Pro and V1.5 Pro on ComfyUI Web, in your browser.
Seedance on ComfyUI Web
Run Seedance models directly in your browser.
Seedance V1.5 Pro Image to Video Fast
Transform images into cinematic videos with Bytedance Seedance V1.5 Pro. Supports first and last frame control for precise motion guidance, optional audio generation, and flexible aspect ratios.
Seedance V1 Pro Fast Text to Video
Generate cinematic videos directly from text with coherent multi-shot storytelling, smooth camera motion, and precise prompt alignment. Ultra-fast generation optimized for real-time workflows.
Why Use Seedance
Image to Video
Transform any image into a cinematic video with Seedance V1.5 Pro. Supports first-and-last-frame control for precise motion planning.
Text to Video
Generate multi-shot cinematic videos from text prompts. Seedance produces coherent storytelling with smooth camera transitions and precise prompt alignment.
Cinematic Camera Control
Dynamic camera movements including panning, tracking, dolly zooms, and orbital shots. Seedance handles complex cinematography automatically.
Ultra-Fast Generation
Seedance's acceleration framework boosts inference speed by over 10x. Generate production-quality video clips in seconds, not minutes.
100% Cloud-Based
No GPU required, no Python setup, no local installation. ComfyUI Web runs Seedance on cloud GPUs — works on any device.
trial-credit tier Available
Start generating Seedance videos with no credit card. Free accounts receive credits that refresh regularly.
How to Use Seedance on ComfyUI Web
Create cinematic AI videos in three steps.
Choose Generation Mode
Select image-to-video or text-to-video. For image-to-video, upload a source image. Seedance V1.5 Pro supports first-and-last-frame control for precise motion.
Write Your Prompt
Describe the scene, camera movement, and style. Seedance excels at complex cinematography — try prompts with tracking shots, dolly zooms, or multi-character dialogue.
Generate & Download
Click generate. Seedance produces clips in seconds thanks to its optimized inference pipeline. Preview, iterate, and download in MP4.
What Is Seedance?
Seedance is ByteDance's flagship video generation model family. Built on a dual-branch Diffusion Transformer architecture with 4.5 billion parameters, Seedance is the first model to natively generate audio and video simultaneously in a single unified pass.
Traditional video generation models create silent video first, then add audio in a separate step. Seedance eliminates this gap by processing visual and acoustic signals together, achieving millisecond-precision lip-sync and naturally coordinated sound effects.
Seedance V1.5 Pro Features
Seedance V1.5 Pro is the latest version, building on V1 with significant improvements in motion quality and generation speed. It supports text-to-video, image-to-video, and first-last-frame generation modes.
The model produces videos at 480p, 720p, and 1080p resolution with configurable duration from 4 to 12 seconds. Supported aspect ratios include 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, and adaptive mode.
Seedance V1.5 Pro features multilingual lip-syncing across 8 languages: English, Mandarin Chinese, Japanese, Korean, Spanish, Portuguese, Indonesian, and Cantonese — with phonetically accurate mouth movements for each language.
Post-training optimizations using Supervised Fine-Tuning (SFT) and Reinforcement Learning from Human Feedback (RLHF) ensure high visual fidelity, while the acceleration framework delivers over 10x faster inference compared to the base model.
Audio-Visual Synchronization
Seedance's defining feature is its native AV sync capability. When generating a video of a person speaking, the model simultaneously produces the speech audio with precise lip movements. Sound effects — footsteps, doors opening, rain — are generated in temporal alignment with their visual counterparts.
This is achieved through the dual-branch architecture where one branch handles visual generation and the other processes acoustic signals, with cross-attention layers maintaining synchronization throughout the diffusion process.
Seedance vs Other Video Models
Seedance competes with Wan (Alibaba), Hailuo (MiniMax), Kling (Kuaishou), and Sora (OpenAI). Its key differentiator is the integrated audio generation — no other open model offers native AV sync at this quality level.
For users who need silent video, Wan 2.6 offers longer durations (15s) and the R2V character system. For audio-visual content, Seedance is currently unmatched in the open-source ecosystem. On ComfyUI Web, you can try both and compare results directly.
Frequently Asked Questions
- Is Seedance free to use?
- Yes. On ComfyUI Web, you get trial credits to generate Seedance videos. No credit card required. Paid plans start at $9/month for more usage.
- Does Seedance generate audio with video?
- Yes. Seedance is the first model to natively generate synchronized audio and video in a single pass — including dialogue, sound effects, and ambient music.
- What resolution does Seedance support?
- Seedance V1.5 Pro generates videos at 480p, 720p, and 1080p. Supported aspect ratios include 16:9, 9:16, 1:1, 4:3, 3:4, 21:9, and adaptive.
- How long can Seedance videos be?
- Seedance V1.5 Pro generates clips from 4 to 12 seconds in length. You can choose the duration based on your needs.
- What languages does Seedance lip-sync support?
- Seedance supports 8 languages for lip-syncing: English, Mandarin Chinese, Japanese, Korean, Spanish, Portuguese, Indonesian, and Cantonese.
- Do I need a GPU to run Seedance?
- Not on ComfyUI Web. Our cloud infrastructure handles all inference. You only need a web browser on any device.