Flux 3 Image
Flux 3 Image is Black Forest Labs' newest image model. It generates detailed,
well-composed images from a text prompt, with native output up to 4K and clean
text rendering.
For editing and multi-reference work, use
Flux 3 Image Edit.
Highlights
- Native 2K and 4K. Choose a resolution tier from
512sq up to 4k
(16MP). Fine textures, faces, patterns and small text stay sharp when you
zoom, crop or print.
- Improved text rendering. Well suited to graphic design, ads, posters and
infographics.
- Composition control. The model is trained to understand layout, so
placement described in the prompt is followed closely.
- One flat price per image, set by resolution.
Parameters
| Parameter | Values | Notes |
|---|
prompt | text | Required. |
resolution | 512sq, 768sq, 1k (default), 2k, 4k | Higher tiers take longer; 4k can take several minutes. |
aspect_ratio | auto, 21:9, 2:1, 16:9, 3:2, 7:5, 4:3, 5:4, 1:1, 4:5, 3:4, 5:7, 2:3, 9:16, 1:2 | |
enable_prompt_expansion | true / false (default) | Rewrites short prompts into a fuller description while keeping your intent. |
safety_tolerance | 0 (strictest) to 4, default 2 | |
output_format | jpeg (default), png | |
Prompting tips
- Write in plain sentences. Describe the subject first, then the action,
setting, composition and style.
- Say what you want, not what you don't. Write "a deserted beach at dawn",
not "a beach, no people".
- Put exact text in quotes and give its style and placement:
a van covered in graffiti that spells "FLUX" in chrome bubble letters.
- Use hex codes for exact colors, paired with a name:
walls painted #0047AB (cobalt blue).
- Use concrete visual details instead of praise words: "soft window light
from the left, 28mm lens, fine film grain" works better than "stunning".
Example prompt
Ultra-wide cinematic shot of a fog-drenched coastal highway at dawn, cliffs on
one side, turquoise sea on the other, a single vintage car with headlights on,
soft golden rim light
blackforestlabs/flux-3/text-to-image
