What aspect ratios and output dimensions are supported?

Aspect Ratios and Output Dimensions

FLUX.2

FLUX.2 gives you direct control over output dimensions. Set width and height to any values you need:

Examples

• Square: 1024 × 1024 (1MP)

• Landscape 16:9: 1920 × 1088 (~2MP)

• Portrait 9:16: 1088 × 1920 (~2MP)

• Ultra-wide 21:9: 2048 × 880 (~1.8MP)

• Max resolution: 2048 × 2048 (4MP)

Images over 4MP are automatically resized. We recommend staying at or below 2MP for optimal quality and speed.

Code example

import os
import requests

response = requests.post(
    "https://api.bfl.ai/v1/flux-2-pro",
    headers={
        "accept": "application/json",
        "x-key": os.environ.get("BFL_API_KEY"),
        "Content-Type": "application/json",
    },
    json={
        "prompt": "A panoramic mountain landscape at golden hour",
        "width": 1920,
        "height": 1088
    },
).json()
print(response)

FLUX.1 Kontext

Kontext outputs at a fixed ~1MP resolution. You can set aspect_ratio (e.g., "21:9") and the model adjusts dimensions to the nearest multiples of 32 pixels while staying at 1MP. Supported range: 3:7 to 7:3.