Open weights
5.6B checkpoint you can fine-tune and self-host.
Flux 3 Klein Online
The open-weights member of the Flux 3 family — run Flux 3 image generation free in this studio, or take the 5.6B checkpoint home and run it on your own GPU.
AIモデル 6 クレジット
プロンプト0/2000
著作権で保護されたキャラクター・ロゴ・音楽や、敏感・露骨な内容は避けてください。ブロックされる場合があります。
解像度
アスペクト比
バッチ生成1
推定コスト：6クレジット
作品がここに表示されます
モデルを選び、ショットを描写して「生成」を押してください。
Flux 3 Klein Onlineの魅力
クリエイターがFlux 3 Klein Onlineを選ぶ理由
Flux 3 Klein is the open-weights member of the family — try the Flux 3 engine free in this studio, or self-host the checkpoint.
Layout control
Bounding boxes place elements or confine edits.
Up to 4K
Native high-resolution output from a small model.
Try free online
No GPU needed — free starter credits in this studio.
Flux 3 Klein guide
Flux 3 Klein: the open-weights path into the Flux 3 family
Flux 3 Image Klein is Black Forest Labs’ open-weights release in the Flux 3 family: a 5.6B-parameter model that does text-to-image, instruction editing, multi-reference generation, and bounding-box layout control at up to 4K. This guide covers what Klein is, how it differs from the hosted model, and the two ways to run it — online here, or on your own GPU.
What Flux 3 Klein actually is
Klein packages the core FLUX 3 Image capabilities into a small open checkpoint: text-to-image, image editing, multi-reference generation with up to ten images, and bounding boxes that control where elements are placed or confine an edit to a defined area. It generates natively at up to 4K and ships two checkpoints — a step-distilled build for low-latency generation and a base build for fine-tuning and LoRA training.
Quantized FP8, INT8, and NVFP4 builds, developed with NVIDIA support, let it run on a consumer GPU — an RTX 3090-class card is enough — and the same model is served through the BFL API as flux-3-image-klein with prompt upsampling and pixel restoration.
Open weights
Download, fine-tune, distill, and build on the checkpoints under the FLUX Kommunity License.
Layout control
Bounding boxes in the prompt tell the model where things go — a capability most image models lack.
Runs locally
Consumer-GPU friendly builds plus first-party ComfyUI and Diffusers support.
Klein vs the hosted Flux 3 model
The choice is not quality, it is control versus convenience. Klein gives you the weights: fine-tune it on your products or characters, wire it into ComfyUI, run it offline. The hosted Flux 3 model in this studio gives you zero infrastructure: open a tab, write a prompt, and the engine runs — with free starter credits on new accounts.
For experimentation, the fastest path is to try prompts online first, then decide whether your pipeline needs self-hosted weights.
Running Klein yourself
Both checkpoints — black-forest-labs/flux-3-image-klein (distilled, 16 steps) and -klein-base (50 steps, for fine-tuning) — are on Hugging Face, with first-party Diffusers and ComfyUI support. The FLUX Kommunity License permits free commercial use for individuals and companies under $5M in annual revenue; larger deployments license through Black Forest Labs.
Trained LoRAs on the base checkpoint also load into the distilled one, which makes Klein a practical target for style and product adapters.
Try it online, free
The studio panel on this page runs the Flux 3 image engine — write a prompt, attach references, and compare results at 1K before spending credits at 2K or 4K. New accounts start with free credits, and failed generations refund automatically.
Flux 3 Klein Onlineの使い方
Flux 3 Klein Onlineを3ステップで使う
Describe the image
Name the subject, setting, light, and format — or attach reference images.
Choose size and ratio
Pick 1K, 2K, or 4K and an aspect ratio; the estimate updates live.
Generate and iterate
Compare variations, refine with one change at a time, or download the weights and go local.
Flux 3 Klein Onlineのユーザー
画像制作にFlux 3 Klein Onlineを使う人々
Developers
Self-hosted pipelines, ComfyUI graphs, fine-tunes.
Product teams
Custom LoRAs trained on real catalog imagery.
Indie builders
Commercial use under the Kommunity License.
Creators
Free online trials without touching a GPU.
その他のモデル
Flux 3 Klein Onlineと他の全モデルを1つのスタジオで
エンジンを変えてもツールは変えない — Flux 3と最強の公開画像・動画モデルが、Flux 3 AIスタジオで並んでいます。
マルチ参照編集キャラクターの一貫性テキストレンダリング1K〜4K出力対話型編集スタイル転送動画生成バッチ生成
FAQ
Flux 3 Klein Onlineに関するよくある質問
Understand the model, prepare better references, and choose a practical approach to your next image.
01What is Flux 3 Klein?
Flux 3 Image Klein is Black Forest Labs’ 5.6B-parameter open-weights image model — text to image, instruction-based editing, multi-reference generation with up to 10 images, bounding-box layout control, and native output up to 4K.
02Can I try Flux 3 Klein online for free?
Yes — this studio runs the Flux 3 image engine in the browser, and new accounts get free starter credits. No GPU, install, or ComfyUI setup required.
03Where can I download the weights?
Both checkpoints — the fast distilled build and the fine-tunable base — are on Hugging Face under the FLUX Kommunity License, with FP8, INT8, and NVFP4 builds that fit a consumer GPU such as an RTX 3090.
04Is Flux 3 Klein free for commercial use?
The FLUX Kommunity License allows free commercial use for individuals and companies under $5M in annual revenue, plus research and non-commercial use. Larger organizations license self-hosted deployment through Black Forest Labs.
05Klein vs the full Flux 3 model?
Klein keeps the core capabilities — editing, multi-reference input, 4K output — in a small open checkpoint you can fine-tune and self-host. The hosted Flux 3 model trades that flexibility for zero infrastructure work.
Make the next idea visible
次の画像はプロンプト1つ分の距離
Bring a product reference, a character, or a clear headline. Explore a composition, refine the details, and save a version that fits your project.