How to Use FLUX 3 Image Klein
Make an FLUX 3 Image Klein image in the CheaperGen Studio — no code, no install, no Black Forest Labs account. Pick a mode, write one clear prompt, set the size and press Generate. A test costs $0.002; developers can follow the API tutorial instead.
- Modes
- 2
- Text → Image · Edit
- Test image
- $0.002
- 768
- Sizes
- up to 4K
- 5 options
- Failed runs
- $0
- refunded automatically
Prompt builder
Build a FLUX 3 Image Klein prompt
Fill in the parts of the shot; the prompt assembles itself. Send it to the playground below and run it — the steps after it explain each part.
Your FLUX 3 Image Klein prompt
Fill in a few boxes — or start from the example — and the prompt appears here.
Try it
Try FLUX 3 Image Klein here
Runs on your balance at the price on the button; failed runs are refunded. Results are saved to your account.
Before you start
Which FLUX 3 Image Klein mode to use
FLUX 3 Image Klein has 2 modes. Pick by what you already have.
| Mode | You give it | Best for | From |
|---|---|---|---|
| Text → Image | A prompt | Images from a description: concepts, illustrations, ad visuals. | $0.0011/image |
| Edit | Up to 10 images and an instruction | Changing an image you have: backgrounds, colours, outfits, or combining several images. | $0.0011/image |
Step by step
How to use FLUX 3 Image Klein in 6 steps
- 1
Open FLUX 3 Image Klein in the Studio
Open the Studio (it opens with FLUX 3 Image Klein selected), or choose the Image tab and pick FLUX 3 Image Klein in the model menu. Sign in with Google or your email; you pay per generation from prepaid credits.
- 2
Choose what to make
- Text → Image — a prompt.
- Edit — up to 10 images and an instruction.
- 3
Write the prompt
One shot per prompt works best. Cover these, in plain sentences:
- Subject. The main subject and its key details: material, colour, expression, product features.
- Composition. Framing and angle: close-up, flat lay, three-quarter view, rule of thirds, negative space.
- Setting and light. Background, environment and lighting: studio softbox, golden hour, neon.
- Style. Photo, illustration, 3D render or painting — plus lens or medium details.
- Edit instruction. For edits, say what to change and what must stay the same: “replace the background, keep the product and its shadow”.
More structure and examples: the FLUX 3 Image Klein prompt guide.
- 4
Set the options
The settings sit under the prompt; rarely needed ones are behind ⋯. What each does — and to the price — is in the table below.
- 5
Generate
The exact price is shown before you run: press Generate (or ⌘/Ctrl + Enter). The amount is held from your balance and refunded in full if the generation fails.
- 6
Download and iterate
Results appear above the prompt; download them from there. Change one thing per try — the prompt, the composition or a setting — so you know what helped. Compare runs the same prompt on several models side by side, and Code shows the same request for the API.
Settings
FLUX 3 Image Klein settings explained
For Text → Image; the other modes add their inputs (frames, references or images to edit). Prices are per image.
| Setting | Choices | Default | What it does | Price |
|---|---|---|---|---|
| Aspect ratio | 1:1, 4:5, 3:4, 2:3, 9:16, 1:2, 9:21, 5:4, 4:3, 3:2, 16:9, 2:1, 21:9, 7:5, 5:7 | 1:1 | Output image shape. | Changes the price |
| Resolution | 768, 1K, 1.5K, 2K, 4K | 1K | Output size tier: 768 ≈ 0.6 MP, 1K ≈ 1 MP, 1.5K ≈ 2.4 MP, 2K ≈ 4 MP, 4K ≈ 16 MP. Up to 2K, wide and tall ratios keep the long side at 2048 px or less; 4K takes 1:1, 4:3, 3:4, 3:2, 2:3, 16:9, 9:16, 21:9, 9:21. | $0.0011–$0.0342/image |
| Seed(⋯) | Free text | — | Use the same seed and settings to reproduce a result. Leave empty for random. | No effect on the price |
Every tier and a calculator: FLUX 3 Image Klein API Pricing.
Worked example
A first prompt to try
Text → Image with the default settings. Paste it into the Studio and change one thing at a time.
“Editorial still life of a hand-thrown terracotta vase with dried orange ranunculus on a travertine plinth, low golden-hour sun from the left, long soft shadows on a warm plaster wall, medium-format film photograph”
Aspect ratio: 1:1 · Resolution: 1K
$0.002$0.009 for this image
Try it in the StudioAvoid these
Common FLUX 3 Image Klein mistakes
Drafting at 4K
Every try at 4K costs 32.2× one at 768. Settle the composition and motion at 768, then render the keeper at the size you deliver.
Vague edit instructions
Say what to change and what must stay: "replace the background with a beach at sunset, keep the product and its shadow".
Describing what you don't want
Prompts work better when they describe what should be on screen. "No blur" or "no extra fingers" can pull the result towards the very thing you name.
FAQ
How to use FLUX 3 Image Klein: questions
FLUX 3 Image Klein is Black Forest Labs' open-weights model. CheaperGen provides API access to the open weights, run on GPU inference for open-source models, and does not own the model. Trademarks belong to their respective owners.