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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.

xijie_Platinum v1.0
Close-up of a young woman with brown hair and hoop earrings wearing a white Adidas jacket with yellow stripes, playfully sticking out her tongue in a car.
DnD_Grainyboyz Lora FLUX DnD_Grainyboyz V1.0
Wizard's Experimental Photography Lab Portraits
Vixon's Pony Styles - Piotr v1.0 Piotr v1.0
Elle (based on Rick & Morty Anime) - Illustrious V1
Useful Quality Embeddings aid291
Woman warrior standing barefoot against a flat yellow background, wearing a deep purple kimono with golden phoenix embroidery, holding a large ornate halberd, with a blunt ash-blonde bob haircut.
Amber Style [LoRA 1.5+SDXL] SDXL
Ethereal Glow Flux v2 (Epchs 20)
All Disney Princess (Illustrious) Illustrious
An anatomical chart illustrating a great horned owl as a surveillance drone, showing half natural feathers and half robotic machinery with wires, processors, and sensors.
posILustrij v1.0
A tall winged figure in a blue dress adorned with swirling colorful abstract patterns stands against a dark background with artistic splashes and tiny curious characters at her feet.
Sheer Tights (pantyhose) v1.0
White-haired girl with blue eyes sitting on a subway bench with an abstract background filled with many blue eyes.
A glamorous woman in a deep red sequin dress performing with a vintage microphone on a stage with a grand piano and dramatic lighting in a retro nightclub setting.
Get inspirations

Made on Diffus

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

Close-up portrait of a woman with short hair illuminated by blue and red lighting, creating a moody and artistic effect.
Highly detailed biomechanical creature with cybernetically augmented metal spider-like arms and legs, featuring cables and intricate techwear in the style of H.R. Giger.
Closeup portrait of a cyberpunk samurai with a detailed black helmet featuring red neon lights and futuristic mechanical armor.
Close-up portrait of an old man with a long white beard looking down at an open leather book showing a detailed sketch of a woman, warm golden sunlight highlights his wrinkled face.
Close-up of a musician wearing a luxurious golden dress playing a polished violin in a dimly lit concert hall with warm bokeh lights.
A figure in a flowing dress made of swirling bright pinks, blues, oranges, and yellows, surrounded by vibrant paint splashes and floating spheres on a black background.
A sharp and well-detailed portrait of a stylish blonde woman wearing a black leather outfit with red ribbon accents, posing against a solid red background.
Dark digital art of a sailboat with red and blue sails navigating through heavy sea waves at night in a surreal and abstract style.
A whimsical anthropomorphic fox dressed as a Roman warrior wearing a red coat and steel helmet standing in a flower field.
A surreal bioluminescent portrait of a humanoid figure with glowing violet and neon green hues, adorned with clusters of fantastical fungi growing from their head, set against a soft violet background.
Hyper-realistic close-up portrait of a woman wearing an avant-garde mask with silver accents and cobalt blue embroidery, partially covered by a vibrant orange and blue bird of paradise flower against a vivid yellow background.
Stylized illustration of a woman with long dark hair wearing sunglasses, illuminated by green light with a bright yellow background
A detailed realistic oil painting of a shipwreck stranded in icy waters surrounded by large ice formations under enchanted lighting, in a style inspired by Boris Vallejo and Albert Bierstadt.
A futuristic cityscape at sunset featuring tall cyberpunk towers, flying vehicles docked on building platforms, and vibrant clouds illuminated by the setting sun.
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.
Bioluminescent butterflies with soft green light resting on a tree bark resembling a circuit board at night, with bokeh lights in the background.
Close-up portrait of a stylish woman with sleek straight hair parted in the middle, striking winged mascara, ghostly pale skin, wearing a shoulder-less black top, seductively posing with direct eye contact.
Half-visible female face with pale skin and red eyes, the other half concealed by a grotesque demonic skull mask, divided by an ornate sword, wearing a red hood and armor.
Digital illustration of a young woman with black hair, striking amber eyes, white bandage across her nose, facial tattoos, and wearing a black suit with patterned scarf in front of red background with Japanese characters.
A fierce female warrior clad in ornate dark armor holds a large, intricately engraved battle axe, standing heroically before a colossal, fiery-eyed dragon against a dramatic orange and yellow sky.
Digital artwork of a fierce female warrior in intricate dark armor and a hooded cape wielding a glowing red lightsaber against a vibrant red background with shadowy figures.
A gigantic circular futuristic mining city embedded in an asteroid, with icy and rugged terrain, illuminated by blue industrial lights and orange spacecraft thrusters, surrounded by tall cliffs and hovering ships.
Tall dark gothic castle illuminated by warm orange lights, surrounded by large futuristic spheric guard towers, under a bright full moon with a misty rocky landscape.
Digital artwork of a futuristic female model squatting with flowing chrome hair, wearing a fluorescent green overcoat and metallic armor under neon-lit urban background.
A female model in avant-garde fashion with flowing hair and a butterfly wing, wearing leopard trousers and a dramatic coat against a vibrant yellow and red background with a reflective multicolored floor.
Pencil sketch drawing of a large tilted Bauhaus-style concrete structure with simple geometric shapes and a prominent red circle, set against a cracked stone foreground and a reflective water surface.
Blonde woman wearing round sunglasses and a fur-lined jacket holding a transparent umbrella under warm orange neon lights in an urban setting.
A group of five teenagers standing in front of a worn-down post-soviet garage door under greenish fluorescent light, captured with a fisheye lens creating a curved perspective and a gloomy, nostalgic mood.
Stylized oil painting of a confident young Asian woman standing amid surreal voluminous yellow clouds, wearing an emerald green blazer and charcoal trousers.
A female warrior in a white tunic and black futuristic combat armor holding a large chainsaw sword, standing before a mechanical, circular structure with a dark center and light outer ring.
Black-and-white photograph featuring a large ancient Egyptian bust with a textured surface and a cloaked figure in front, draped in dark flowing fabric against a misty background.
Blonde woman in a white spacesuit with red stripes holding a retro-style red and silver ray gun, standing in a narrow urban alleyway under a bright blue sky.
Rapunzel in a Victorian dark dress standing inside a castle with detailed arches, having extremely long braided blond hair trailing on the ground.
A dark, overgrown forest clearing at night illuminated by cold bluish moonlight, featuring a decayed children's picnic scene with worn, lifelike teddy bears seated around a weathered wooden table with moldy food and old tea cups.
Oil painting of a creepy Japanese horror girl Kuchisake-onna with glowing red eyes, pale translucent skin, blood tears, and intricate modern kimono under Rembrandt lighting.
Monochromatic side profile sketch of a futuristic android geisha woman wearing a large dark visor, with an open cyborg mask revealing mechanical parts inside her head and neck.
A hyper-realistic image of a young woman in a dynamic, twisted pose with long flowing black hair. She wears black clothing and is set against a detailed background combining organic and geometric shapes in muted red and gold tones with a noir atmosphere.
Silhouette of a male figure wearing a fedora and trench coat, with red streaming tears and a cigarette, standing under rain in a dark city.
A hooded alchemist figure reading a mystical book while seated on a glowing celestial chair surrounded by white flowers in a misty, otherworldly landscape.
A hellish battlefield with a dark silhouette of a figure holding a weapon, surrounded by burning trees and fiery lava flowing from a large castle under a red 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