Seedance 2 Fast: Text & Image to Video Online
Bottom line
Seedance 2's range at draft speed — the same 4–15 s durations and six ratios, capped at 720p. Start from a prompt or a still image in the Image to Video tool; VdoBloom shows the exact credit cost before each Seedance 2 Fast run, with no separate Seedance account.
Seedance 2 Fast exists to answer one question quickly: is this prompt worth a bigger render? It keeps everything that defines ByteDance's Seedance 2 — the single-second duration ladder from 4 to 15 seconds, the six aspect ratios including 21:9 — and trades the upper resolution tiers for speed, topping out at 720p instead of 4K.
That symmetry with the flagship is the point. Because durations and framing options match exactly, a prompt developed on Fast transfers to Seedance 2 without re-composition: what you saw at 480p in a 21:9 frame is what you will get at 4K in the same frame. Fast becomes the look-development stage; the flagship becomes the print run.
Like its siblings, it takes both text and image inputs, so image-driven work gets the same rapid loop. Runs are metered in VdoBloom credits with the price for your settings shown before generation — exactly what you want from a model whose job is to be run many times.
What creators use Seedance 2 Fast for
- Run five prompt variations at 480p, shortlist the winner, and re-render it on Seedance 2 at 4K.
- Draft 21:9 shot compositions at speed before committing to flagship renders in the same frame.
- Deliver 720p social cuts directly when the destination platform will compress the video anyway.
How to use Seedance 2 Fast on VdoBloom
- 1Open the Image to Video tool and select Seedance 2 Fast from the model picker.
- 2Write your prompt — or upload a starting image for image-to-video.
- 3Choose your duration (4–15s), quality (480p/720p), aspect ratio, review the credit cost, and generate.
Frequently asked questions
What is the difference between Seedance 2 Fast and Seedance 2?
Fast keeps the identical 4–15 second single-step duration ladder and all six aspect ratios including 21:9, but caps resolution at 720p where the flagship goes up to 4K. In exchange, it returns results faster, which suits drafting and iteration.
Will prompts I develop on Fast transfer to Seedance 2?
Yes, and that is the intended workflow. Because duration and framing options match the flagship exactly, a composition proven at 480p or 720p re-renders at higher resolution without changing the prompt or ratio.
What resolutions does Seedance 2 Fast offer?
Two tiers: 480p and 720p. Both are available across the full 4-to-15-second range and all six aspect ratios.
Does Seedance 2 Fast filter content differently from Seedance 2?
No. Both carry the MODERATE label, meaning standard content filtering comparable to mainstream providers. Prompts behave the same across the two models, which keeps the draft-then-finish workflow consistent.