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Black Forest Labs

FLUX.1 Fill [pro]

FLUX.1 Fill [pro] is Black Forest Labs's dedicated inpainting model. It fills masked regions of images using text instructions while preserving the coherence, lighting, and style of the surrounding content. Your use subject to Black Forest Labs's Terms & Privacy Policies.

Image Gen
Use with AI GatewayView docs
index.ts
import { experimental_generateImage as generateImage } from 'ai';


const result = await generateImage({
  model: 'bfl/flux-pro-1.0-fill',
  prompt: 'A red balloon on a wooden table.'
});
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About FLUX.1 Fill [pro]

FLUX.1 Fill [pro] is a specialized model within Black Forest Labs's FLUX.1 lineup, available through AI Gateway since October 1, 2024 as part of the image-only model expansion. Unlike the Kontext models that focus on instruction-based editing, Fill Pro is specifically engineered for inpainting: generating content for a defined masked area within an existing image.

Inpainting requires a model that simultaneously understands the unmasked context (colors, textures, lighting direction, perspective, stylistic character) and generates new content for the masked region that blends seamlessly. FLUX.1 Fill [pro] treats this as its primary function, making it more appropriate for mask-based fill workflows than general-purpose editing models.

Practical applications include object removal and replacement, background extension (outpainting), e-commerce product photo cleanup, and generative content insertion (placing a new element by masking its target region and describing it in a text prompt).