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Black Forest Labs' Flux.2 line

Run Flux.2 Klein in Your Browser

Klein 9B and 4B, plus the 2,100+ community models built on them. No 9-billion-parameter download, no GPU, no environment to keep alive.

Images generated on Diffus
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The difference, not the spec sheet

Why Run Klein Here

The weights are open. What is not free is the disk, the card and the afternoon of setup.

2,100+ Klein Models, Already Hosted

Community checkpoints and LoRAs built on Klein 9B and 4B are on disk and selectable. Paste a Civitai link to add one that isn't.

Browse models

One Node, the Whole Workflow

Generate, edit, inpaint, outpaint and face swap from a single self-contained Klein node in ComfyUI — no graph to assemble before the first image.

Open ComfyUI

Compare It Against the Rest

Flux.1, Flux Kontext, Qwen, SDXL and SD 3.5 are in the same session. Run one prompt through several and keep what wins.

Start generating

Core capabilities

What You Can Do With It

Generation is the first step, not the whole job.

Prompt to picture

Text to Image on Klein

Prompt Klein 9B for quality or 4B when you want the lighter model, at the aspect ratio you need, with the sampler and guidance already tuned for the Flux.2 line.

Start generating
Selecting a Flux model on Diffus
Edit where you generate

Edit, Inpaint and Outpaint

The Klein node covers editing in the same place you generate — repaint a region, extend the frame, swap a face — without exporting and losing the parameters.

Open ComfyUI
Editing an image on Diffus
Bring your own LoRAs

Stack Community LoRAs

Klein has its own growing LoRA ecosystem on Civitai. Import one by URL and stack it, or fine-tune your own here and use it the moment training ends.

Browse models
A ComfyUI workflow on Diffus

How it works

Three Steps, No Setup

Nothing to download and no hardware to buy.

step 1

Pick Klein

Choose Klein 9B or 4B, or a community fine-tune built on either.

step 2

Write the Prompt

Or bring an image to edit — the same node handles both.

step 3

Generate and Refine

Inpaint, outpaint or upscale in place. Outputs land in your gallery.

Get started
Free creator tools

More Free Tools to Try

Single-purpose tools that need no setup. Describe it, click, done.

Flux 1 Image Generator

Text to image on the Flux.1 line, with community LoRAs.

Try for free

Flux Kontext Image Editor

Prompt-guided edits that keep character and style consistent.

Try for free

AI Image Generator

Text to image with community models, styles and aspect ratios.

Try for free
Explore the library

Models Built on Flux

Checkpoints and LoRAs across the Flux line, ready without a download.

Close-up of a colorful layered dessert in a clear cup topped with whipped cream with a striped straw, set in a cozy restaurant interior with warm ambient lighting.
Close-up portrait of a girl with short black hair and green eyes wearing dark sunglasses, illuminated by warm golden hour light with high contrast and volumetric lighting effects.
Vixon's Illustrious Styles - Expressive Detailed Art illust
Valbun Style Illustrious
[SDXL]LuanFangHua | 乱芳华 | 国风大模型 v1.0
Ri-mix - [Illustrious + Anima] Bravo
A rat-like monster with red glowing eyes, sharp claws, and tattered leather wings wearing detailed dark fantasy armor standing on a log in a foggy forest.
Keij No.01
xa_gueuzav (xaxaxa) art style [illustrious-XL] v1.0
Melkor Mancin Style V4 [Illustrious-XL]
Anime-style girl with short dark hair and red eyes wearing a bike helmet, backpack, and pleated skirt, riding a bicycle on a crosswalk at sunset, looking back angrily.
Close-up of a glowing blue and purple crystal surrounded by moss on a wooden tavern table with warm low lighting and rustic wooden beams in the background.
Stylized illustration of a sulking girl with orange hair, deep blue eyes, wearing a chest harness and an o-ring collar, rendered in a partially colored painterly sketch style.
A blonde woman with very short curly hair wearing a light blue mini dress stands laughing joyfully with a dynamic pose against an abstract, glitch-patterned, dark background.
A girl with long black hair and red eyes sits confidently on an ornate chair holding a glowing red katana, dressed in a black floral kimono and high heel boots, set in a dark, chain-decorated room.
30-year-old woman in a bathroom wearing a pink towel wrapped around her head, white tank top, and patterned loose pajama pants, taking a night time selfie with a small smile
Side view of a blonde woman kneeling indoors wearing a floral kimono and thigh-high boots, holding a katana in a rustic wooden room.
Detailed vintage-style illustration featuring a skeletal figure with long hair, depicted in dark red, pale brown, and black hues, set at a Dutch angle.
Oil painting in impressionism style depicting a blonde woman in a white dress sitting on a patterned sofa with a calico cat resting on her lap, both characters showing emotional expressions.
Anime style blonde girl with twin drills hairstyle, decorated with gemstone pins and ribbons, giving a thumbs up with a smiling expression.
Get inspirations

Made on Diffus

Work from the community, with the model and prompt behind every image.

Close-up of a white-haired girl with bright, gem-like blue eyes and round glasses, featuring a broken gem on her cheek and colorful flowers around her face
Close-up portrait of a techno orc prophet wearing a frost-covered dented GP-5 gas mask with glowing teal crystal lenses, set against a cold grey wasteland background.
Cyberpunk cityscape featuring a large cylindrical structure with a yellow kiosk at its base, surrounded by industrial walkways and buildings. A young female figure stands contemplatively in the foreground within a rainy, muted-toned urban environment.
A grotesque creature made of corroded teal-green metal with rust patches, wearing a spherical helmet with holes, holding a large shield and a blade-like weapon, standing on a muddy reflective surface with a hazy sky background.
A solitary figure in flowing white robe stands on cracked ground, split by a vertical luminous fissure with contrasting blue and orange light and fractured textures.
Close-up of a cyborg girl with blonde hair tied in a ponytail, green eyes, and black mechanical body armor holding a katana, posed against a red to black gradient background.
Close-up monochrome portrait of an eerie anthropomorphic rabbit cyborg with glowing red eyes and illuminated ears, set against a cloudy sky background.
Digital landscape of a large oak tree silhouette against a vibrant starry nightly sky with orange and dark red highlights, flying birds, and distant stars
Cinematic portrait of a young person with smooth skin, dramatic lighting, subtle film grain texture, and motion blur effects emphasizing emotion and depth.
A female cyborg with metallic bodywork and glowing orange eyes in a dynamic pose against a dark background filled with golden glowing lights and particles.
A dark fantasy figure in a futuristic, fantastic costume with glowing golden wings and bright eyes, rendered in an atmospheric oil painting style.
Close-up portrait of a gothic muse with pale face and dark hair, featuring a fragmented reversed cross overlay and wisps of smoke in monochrome tones.
A striking portrait of a blonde woman wearing large neon orange glasses with vivid blue and red lighting on her face and hair, dressed in black against a white background.
Two girls looking out of a window with an intricate cable wiring background and a flower basket hanging on the window ledge, featuring watercolor effect.
Two girls with orange and blonde hair walking three dogs along a dirt path on hills near a village at early morning with gradient sky and long shadows.
A fantasy scene showing a frightened elf girl with long light brown hair and piercing green eyes holding a burning torch in a dark cave, while a glowing-eyed skeleton looms behind her.
Vintage matte ceramic teacup beside a stack of worn leather-bound books and a dried bundle of lavender on an aged concrete tabletop with strong natural daylight shadows.
A young woman with long curly blonde hair wearing a flowy sundress sitting barefoot on the hood of a light blue 1950s Chevrolet Bel Air parked on Route 66 during golden hour sunset.
A young woman sitting in a large green leaf shaped like a boat, floating on a turquoise lake filled with water lilies, surrounded by a mystical forest at sunset with fireflies in the air.
Woman in profile wearing a traditional black kimono with intricate red, gold, and floral designs, standing with elegant posture surrounded by flowing waves and birds.
Portrait of a robot girl with a metal body, glowing blue details, punk tomboy hair, showing broken parts with sparks and pistons in a dimly lit industrial background.
Close-up of a cyborg with a youthful face and highly detailed prosthetic arms featuring elongated fingers and cinematic lighting.
Digital painting of a large black cat with bright yellow eyes facing a small white mouse wearing a brown leather tunic on a kitchen floor.
Cubist side-profile illustration of a male figure with white flowing hair, glowing orange eye, black ruff collar, red diamond-patterned coat, black gloves, holding a staff, against a textured ivory and tan background.
A cinematic impressionist painting showing a dramatic figure in yellow standing against a yellow wall with a red background shadow, featuring high contrast and bold outlines.
Woman in tattered Bedouin-style clothing watering a vibrant sunflower in a volcanic ash-filled dystopian environment at sunset.
A dramatic alien volcanic landscape featuring two colossal symmetrical obsidian monoliths flanking a glowing molten lava waterfall at sunset under a swirling purple and orange sky.
A colossal dark monolithic tower with glowing crimson circuitry stands on an alien world under a massive blue planet and a star-filled night sky, with a lone cloaked figure nearby.
A high-tech, cylindrical space station tower rising above misty cliffs with floating clouds and sleek spacecraft flying nearby under a cloudy sky.
Portrait of a woman wearing a futuristic metallic kokoshnik adorned with neon light circuits and glowing runes, featuring Slavic embroidery and cyber fashion elements.
A lone traveler stands on a rugged cliff edge beside a solitary tree bathed in golden sunset light overlooking a vast ocean of clouds under a vibrant blue-to-violet sky.
A person in a red coat stands on a coastal road holding luggage, watching a rocket launch creating a massive explosion cloud in the sky.
Dark surreal landscape featuring a swirling vortex with a black sphere in the sky above a mysterious castle atop a hill, with a desolate village and barren trees in the foreground.
A skeletal figure with a red-capped mushroom hat and long flowing hair stands in a bioluminescent forest surrounded by glowing purple mushrooms and magical spores.
Person in a dark hooded sweatshirt with a stylized duck mask featuring glowing orange eyes and a yellow beak, seated with Nike sneakers by a basketball in a dimly lit textured urban environment.
Portrait photograph showing a woman's face with natural skin and freckles, illuminated by focused light creating long shadows; her huge, wavy hair fills the background, resembling a hair-made backdrop.
A distant girl wearing a white animal hat and a light green floating shirt stands near the ocean, under a light blue sky with pastel hues.
A detailed bronze mechanism on a worn tile floor emits a glowing cyan light while small figures decode maps in a dim archive room, with a mysterious creature watching from the doorway.
A female silhouette standing in a vibrant flower field wearing a long dress, with petals dissolving into the pastel-colored sky in a dreamy, watercolor style.
Black cat with yellow eyes and a corgi dog sitting on a rooftop against a deep red-orange vibrant sunset sky.

Flux.2 Klein — FAQs

Try Klein Without Downloading It

And put it next to Flux.1, Qwen and SDXL on the same prompt.

Get started

2,100+ Models

No GPU

Product screen shoot