Black Forest Labs launches 4K video upscaler
Black Forest Labs has released FLUX Video Upscale, a paid API tool that regenerates video at up to native 4K, aimed at teams whose AI-generated footage must meet broadcast and campaign delivery specs.
Black Forest Labs announced FLUX Video Upscale, a standalone FLUX Tool and API endpoint that takes video from 480p upward and regenerates it at higher resolution, up to native 4K.
The company says the tool reads FLUX 3 output natively and can fix artifacts that general-purpose upscalers may miss, such as smudged faces or grid patterns on textures like water and grass. Its stated reasons for building it: local upscalers lose quality at broadcast and campaign resolutions, and today's high-quality upscalers can be slow on video at scale.
The upscaler runs in two modes:
- Precise: 4 steps, $0.07 per megapixel-second. BFL says it is faster and cheaper, and the better choice when identity or reference details need to stay consistent.
- Creative: 8 steps, $0.10 per megapixel-second. It uses more steps for repair and detail generation but can change or replace identity, so reference consistency is lower.
An upscale_factor parameter accepts 1.5x, 2x, and 3x. From an HD input, BFL says those settings come out at roughly 1080p, 2K, and 4K.
The tool is available through the BFL API and playground. BFL did not publish benchmark comparisons against other upscalers, processing-speed figures, or maximum clip lengths. It also did not say how well the tool handles video that was not generated with FLUX.