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Place elements with bounding boxes in FLUX 3

Lay out a scene precisely by writing bounding boxes for each element into the prompt, FLUX 3's new layout control.

FLUX (Black Forest Labs)Image generationRuleStack original

Written for FLUX 3 Image Klein (open weights) · Updated 2026-10-17

Note: Review and test before use. Provided as is, without warranty. See Terms.

[Overall scene and style, e.g. a bright flat-lay product photo on pale linen]. [Element 1] at box [x1,y1,x2,y2]. [Element 2] at box [x1,y1,x2,y2]. [Element 3] at box [x1,y1,x2,y2]. [Lighting], [palette].

Replace everything in [square brackets] with your own details.

Settings & parameters

• black-forest-labs/flux-3-image-klein (distilled, ~16 steps, no CFG) in Diffusers or ComfyUI; base checkpoint at 50 steps with CFG for fine-tuning
• Runs on 8 GB VRAM with the INT8 build; also on the BFL API
• Check the model card for the exact box coordinate format

Variations

• Move an element in a reference image by giving its new box.
• Magazine layout: reserve an empty box for the headline.

Tips

• Keep boxes from overlapping unless you want occlusion.
• License: FLUX Kommunity License; read its terms before commercial use.