How are masks used in FLUX.1 Fill Pro?

Upload an image and a mask. White mask areas identify the regions to regenerate. Soft mask edges help Fill blend into surrounding pixels.

Which workflows are available in FLUX.1 Fill Pro?

Extend canvases beyond the original borders with coherent context. Large extensions work better as several smaller outpaint passes.

Adjust inference when fills need tighter adherence or smoother blends. Mention lighting, material, and perspective for masked regions.

Edit selected image regions with a mask or extend an image beyond its original frame using text instructions.

What it is good for

Edit selected image regions with a mask or extend an image beyond its original frame using text instructions.

Remove distractions and generate context-aware replacements.

Outpaint backgrounds for new aspect ratios or banner crops.

Fix small regions in product or portrait images without full regenerations.

Key capabilities

Upload an image and a mask. White mask areas identify the regions to regenerate.

Extend canvases beyond the original borders with coherent context.

Edges and lighting blend more convincingly for delivery work.

Describe what belongs inside the mask instead of cloning nearby pixels.

Adjust inference when fills need tighter adherence or smoother blends.

How to get a strong result

Start with the subject, then add lighting, style, and anything that must stay the same. Upload a reference whenever you want a more controlled edit.

1
Feather masks slightly
Soft mask edges help Fill blend into surrounding pixels.
2
Describe context in the prompt
Mention lighting, material, and perspective for masked regions.
3
Try Dev for mask tests
Test a small masked region before making a larger change, and inspect the edges of the result.
4
Outpaint in stages
Large extensions work better as several smaller outpaint passes.