Image model guide

FLUX 3 Klein image generation with flexible file output

The FLUX 3 family product available on this platform: text generation and reference editing at 1K, 2K or 4K, with PNG, JPEG and WebP output.

Controls and specifications

Klein handles both starting points. Write a description for a fresh image, or upload references for an edit, and pick the tier and shape that match the destination.

Output format is the detail worth noticing: PNG, JPEG and WebP are all selectable, so web-focused work can ship straight to the format it needs.

Quality tiers
1K · 2K · 4K
Reference images
10
Shape options in text mode
1:1 · 4:3 · 3:4 · 3:2 · 2:3 · 16:9 · 9:16 · 21:9 · 9:21
Shape options when editing
1:1 · 4:3 · 3:4 · 3:2 · 2:3 · 16:9 · 9:16 · 21:9 · 9:21 · Automatic
File types
PNG · JPEG · WEBP
Prompt limit
5000 characters

Choose a quality tier, a shape and an output format. In editing mode the shape list also includes automatic, which follows the reference you uploaded.

What this model is good at

Generation and editing

Generate from a written description or edit your own images, with up to ten references per edit.

Three file types

PNG, JPEG and WebP output, selectable per task rather than fixed by the model.

Automatic shape in editing

Keep the proportions of the reference automatically, or pick an explicit ratio from the standard list.

Typical projects

Web-ready imagery

Produce WebP directly for pages where file weight matters.

Reference-matched edits

Let the output adopt the reference proportions instead of forcing a ratio.

Standard-format work

Everyday image generation across the usual ratio list without specialist options.

Limits to know before you start

  • The prompt limit is 5000 characters; several other image models on this platform allow 20000.
  • No explicit background control, so transparency is not a selectable option here.
  • Reference editing requires at least one uploaded image.

How to start

1

Open the workspace

Use a button on this page. It opens the right workspace with this model already selected, in the language you are reading now.

2

Describe the result

Write what should happen in the shot or image. Concrete subjects, framing and action give the model more to work with than short labels.

3

Set the controls and confirm

Choose length or quality tier, shape and sound where offered, then read the credit quote for those exact settings before you generate.

What it costs

Generation uses account credits. Cost depends on the model, quality and output size or duration. Reference images, video or audio may add charges in some modes. Check the workspace quote for your selected inputs and settings before generating; the pricing page lists credit packages.

See credit packages

Questions about this model

Is FLUX 3 Klein the only FLUX 3 model here?

Yes. Klein is the FLUX 3 family product selectable on this platform today; other family variants are not offered.

Can I export WebP?

Yes. PNG, JPEG and WebP are all selectable before you generate.

How many references does editing accept?

Up to ten images per editing task.

Does it support transparent backgrounds?

No. There is no background control on this model, so use a model with explicit background support for transparent output.