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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.

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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.

[Style/Pony] RELSM - Semi Realism✨ v1.0
[Pony] Geekpower AI Styles SomethingWeird
Ariel (The Little Mermaid) Disney Princess - | Illustrious XL | XL PONY | SD 1.5 - by YeiyeiArt Ariel PONY XL V.
Close-up selfie of a woman wearing makeup in natural lighting with mountains and a sunset in the background
Vixon's Cute Styles - colourcore colourcore v1.0
Close-up portrait of a grimdark sci-fi figure wearing a heavily detailed gas mask with glowing green circular lenses, covered in religious symbols and tangled wires, holding a glowing mechanical relic cube.
Velvet's Mythic Fantasy Styles | Flux + Pony + illustrious + ZiT + Anima + Krea2 Pony Anime Illustrations
Not Artists Styles for Pony Diffusion V6 XL Smooth Anime [M]
A dynamic illustration of a girl in a floral summer dress throwing a baseball towards the viewer, set against an orange background with motion lines and dramatic perspective.
Cyberpunk android with a robotic arm standing in a steamy shower with rain falling, viewed through a wet glass panel, set against a futuristic city backdrop at night.
Photorealistic image of a Japanese girl with blue bob hair wearing a shiny white and black edgPlugsuit bodysuit sitting on a rooftop at sunset in Tokyo.
Steampunk woman wearing a corset dress and tiny top hat, holding an owl, standing framed in a riveted teal train doorway with cinematic low-key lighting.
Humans LyCORIS v1.0
Portrait of a nordic female demon with flawless crimson skin, white marble horns curving from her temples, sharp white graphic eyeliner, and avant-garde red couture fashion against a smoky gray background.
Anime-style girl in a pink hoodie bending forward, tying red high-top sneakers, with long brown hair and a green backpack outdoors in a park setting.
Portrait of a cyberpunk girl with pink hair, yellow eyes, sharp golden teeth, wearing a futuristic black outfit and metallic collar against a vibrant neon background.
A futuristic robotic insect warrior with golden butterfly wings and chrome armor stands confidently with cables in each hand, set against a vibrant paint splatter background.
A retro anime style wolf girl with ginger hair, wolf ears, and a bushy tail sits on a moss-covered balcony railing with a playful expression, plants around, and buildings in the foggy background.
Get inspirations

Made on Diffus

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

Profile view of a cyberpunk comic woman in white attire with a futuristic mechanical spaceship headdress, set against a dark background, featuring a surreal, sci-fi atmosphere.
Dominant giantess with white hair and full arm tattoos wearing a white vest, navy pants, and cape, standing confidently in a rainy city street at night.
A detailed realistic oil painting of a ghul-like monster in intricate armor standing in a dark street at night, accompanied by a young woman holding a lantern.
A red and black ink wash painting depicting an advanced sci-fi cityscape with towering skyscrapers, a calm river with a bridge, and a clear sky.
A mystical denizen with ornate golden armor decorated with blue gemstones, extending a serrated claw against a dark background.
A solitary post-apocalyptic sorcerer in flowing tattered robes stands on a cracked barren landscape under swirling gray clouds, holding a glowing magical staff.
A dark fantasy vampire woman with two-tone hair, wearing a detailed red and black corset dress with gothic accessories and sharp lineart.
A surreal, retro risograph style image featuring a huge mechanical skull with glowing red eyes and attached smaller skulls, set against a sci-fi landscape, with a lone figure facing it.
A young woman with blonde hair sitting outdoors on a cushion with an intense gaze, wearing a white shirt and floral skirt.
A vast scifi super structure featuring large, imposing futuristic architecture with an industrial design, illuminated by strong light and shadows, with a few human silhouettes in the foreground
Close-up digital painting of an astonished owl with large golden eyes, intricate feather details, and dramatic chiaroscuro lighting.
A black silhouette of a raised hand reaching up to catch delicate flying dandelion seeds against a white sky, with a minimalist monochrome background and soft misty atmosphere.
Double exposure artwork blending a majestic cathedral with golden domes and Gothic arches into the right side of a woman's delicate face, featuring a luminous cosmic halo and shimmering golden embers.
A woman with a 2000s scene emo haircut and dramatic black winged eyeliner walks purposefully down a foggy cobblestone street wearing a black cloak, with candlelit windows glowing behind her and ash drifting in the air.
Massive Shai-Hulud worm with a tooth-covered exoskeleton emerges from golden desert dunes, as three robed Fremen walk facing it under dramatic sunlit skies.
A blonde female explorer in 1930s safari attire wearing a wide-brimmed hat stands amidst dense tropical jungle vegetation with dappled sunlight and soft lighting.
A highly detailed portrait of a woman with long wavy hair, wearing an elegant blue gown with wide sleeves, holding white lilies against a deep blue background with dramatic cinematic lighting.
A glowing cosmic skull in space, with starry purple and magenta liquid flowing from its open jaw into a swirling pool of energy, set against a star-filled void.
Castle ruins bathed in soft dawn light with blooming and decaying flowers in the foreground, captured in a serene twilight setting with detailed textures.
A blonde-haired man swimming underwater with arms extended forward, surrounded by rising bubbles, illuminated by soft, dramatic lighting against a dark background.
Sinister cloaked figure with unnaturally long limbs perched atop a majestic dome overlooking a gothic cityscape at sunset, with towering spires and eerie lighting.
A dark silhouette of a girl in a black dress with abstract patterns, standing against a white background with vibrant colorful paint splashes exploding behind her head.
Portrait of a woman with pale white skin, black hair styled in a hime cut, red lips, intricate black tribal face tattoos, white eyes with black sclera, wearing white mecha horns adorned with dreamcatchers, and dressed in a black lace corset.
A girl with a braided ponytail wearing a pinafore dress stands in a hallway bathed in bolt green volumetric lighting, with shadows cast by windows.
Close-up half body shot of a hyperdetailed feminine android cyborg with glossy white porcelain skin, short wavy hair, and glowing multicolored lights on her robotic armor.
Colossal crystalline citadel with three tall azure towers floating above dense clouds under bright sunlight, featuring glowing energy veins and reflective surfaces.
A glowing female knight with purple butterfly wings and glowing purple eyes, clad in high tech dark armor, riding a black unicorn with glowing purple eyes and a bright horn, surrounded by magical forest.
Four-man tactical squad in dark gear with burlap sack masks and blood-red pentagrams on chest plates, standing in a dim, run-down apartment hallway.
A Japanese female warrior in a dramatic pose holding a katana, depicted in traditional Japanese ink on paper style with sepia tones, tattoos, and flowing black and red hair.
Goddess with flowing red hair in an ornate green and gold medieval dress, standing before clouds and a golden halo under volumetric lighting
Dramatic dystopian illustration showing a giant skull with glowing red eyes amidst an apocalyptic cityscape, surrounded by red flames and armed figures symbolizing social inequality and revolution.
Extreme close-up of a man crying desperately with tears dripping, mouth open in anguish, rendered with saturated colors and bold line inking in a graphic novel style.
A sleek starfighter spaceship with neon plasma cannons on its wings, silhouetted against a dark background with vibrant rainbow colours, stars, and nebulas.
A woman with curly brown hair in a white oversized sweater stands in a pastel blue kitchen, holding a white cat and drinking from a pink can.
Full-body digital artwork of a female warrior wearing a white and gray futuristic combat suit with mechanical wings, holding a katana sword while kneeling, wearing a helmet and face mask.
A black cat gazes into water under a starry night sky with a glowing crescent moon and bright stars reflected in rippling water.
Pixel art of Pikachu lying on its back smiling with eyes closed in a grassy patch surrounded by colorful flowers and a poké ball.
A giant, thick-furred spider with glowing red eyes emerging ominously in a dark cave filled with webs, bones, and a haunting atmosphere
Anime illustration of Frieren with grey twintails and green eyes, lying barefoot on a bed wearing a white nightie, looking back with a smug smile.
White-haired male warrior with heterochromia and black armor parrying an attack from a glowing blue robotic skeleton in fantasy city ruins.

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