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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.

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.
Aka6 [Illustrious] Style LyCORIS v1.0
A cat girl character with black hair, green eyes, round rimless glasses, cat ears, and tail, wearing an off-shoulder green sweater, kneeling barefoot.
Somman v1.0
Link from the legend of Zelda BOTW [FLUX DEV] v1.0
A stylized white-haired girl with green eyes wearing a dark green overcoat stands in a snowy village at night with falling snow and illuminated lampposts.
Close-up portrait of a girl with long black hime-cut hair and red eyes drinking blood from a blood bag using a straw, dressed in a white coat and black shirt with a red necktie, set against a dimly lit dark background with soft shadows.
Quaintly Chaotic Comtesse FINAL
AyamiKojima Style v1.0
Get inspirations

Made on Diffus

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

Close-up photorealistic portrait of a wabi sabi Asian woman warrior wearing an auburn red beret with dark matte eye makeup, striking eyes, and glossy red lips showing vampire fang teeth.
A dark-skinned female wearing a black kimono with a white sash and thighhighs, standing in a lotus pond surrounded by trees and glowing fireflies, holding a katana at her waist and adorned with a pink flower in her hair.
An infected insectoid creature with cracked carapace and fungal ridges crawling beneath a rusted ruined transport vehicle, glowing bioluminescent fluid dripping from its abdomen.
A fantasy painting of a halfling girl with red hair and freckles, sitting barefoot in an ancient crystal cavern adorned with tall, clear crystals, wearing a medieval lace-up tunic, inspired by Frank Frazetta.
Menacing spectral figure with glowing eyes and a fiery sword stands in a shadowy gothic cathedral illuminated by eerie blue light and swirling mist.
Portrait of a regal woman with vibrant red hair styled in an updo, wearing a flowing yellow gown and a golden feather-like crown, seated on an intricately carved black bench in a dark enchanted forest.
A giant grotesque mech standing in a dark, narrow sci-fi city street with glowing turquoise light and silhouetted human figures.
Surreal expansive space landscape featuring golden domed and spired ancient structures by a meandering blue river under a starry sky with floating spheres.
Close-up hyper-realistic portrait of a young person with pale skin, freckles, and reddish hair, adorned with golden forehead ornament and earrings, under cinematic lighting.
A serene mountain landscape at night with a large glowing full moon above rugged snow-patched mountains, a lush green valley below, and blooming pink and purple flowers in the foreground.
A glowing orange arc of light forming a near-complete circle around a bright sun setting behind mountain peaks under a twilight sky
A woman with long auburn hair wearing a flowing bohemian dress sits on a wooden swing during sunset with a warm golden backlight and a blurred background of wildflowers.
A woman with long dark curly hair wearing a white tight T-shirt and mint green pleated skirt stands on marble steps of an ancient Greek amphitheater pointing forward, holding a small terracotta amphora filled with olive oil, with sea and mountains in the background under warm late-afternoon sunlight.
A romantic couple sits at a wooden table under soft afternoon light streaming through weathered French double windows, overlooking a turquoise lake and green mountains.
A young tween princess with flowing white hair and a gold crown wearing a sleek black dress stands in front of a large parked futuristic spaceship under stormy skies.
A surreal art piece depicting a feminine figure with two contrasting faces intertwined by flowing ribbon-like structures in sepia tones, set against a textured background.
Closeup of a haunting humanoid figure with a tattered white hood, glowing eyes, a macabre grin, and a colossal sword against a neon dystopian cityscape.
A colossal floating metallic orb levitating above a sunlit meadow with rolling hills, under a bright turquoise sky with soft layered clouds.
A surreal woman with a reflective metallic helmet head and flowing dark hair, dressed in a sleek black suit, set against a vibrant cosmic nebula background.
A lone space maid gunslinger wearing tight maid armor and thigh-high armored stockings stands with a glowing cyclopean eye and an oversized sword, in front of a swirling neon black hole.
A terrified couple hugging on a red couch while surrounded by menacing demonic creatures with glowing eyes and fangs, illustrated in a detailed fantasy style.
Moss-covered ancient cathedral ruins with shattered stained glass windows, illuminated by visible sunbeams and godrays, featuring a clear pool of water on the ground
A chaotic digital illustration of Jason Voorhees in green armor sitting on a barbershop stool holding hands with a masked humanoid robot holding a chainsaw, with another masked figure holding a chainsaw behind them. The scene is set inside a dimly lit barbershop with scattered debris and neon signs.
A photorealistic depiction of a woman wearing ornate white and gold armor underwater with flowing dark hair and a red dress surrounded by red flowers and bubbles, eyes closed.
Front profile of a punk 80s British model woman with a 50s hairstyle, wearing a white turtleneck dress and large white sunglasses, standing against a dark wall with cinematic film style and grain.
A photorealistic image of large black stones stacked in perfect balance on a desert ground with distant mountains under a soft, warm sky, rendered with cinematic film grain and high contrast.
A blonde girl with layered haircut and a single braid sits on a low wall wearing a sleeveless high-collar dress with an asymmetrical hem against a white background.
Side silhouette of a young woman with a long braid walking through a quiet street at sunset with a large pink sun and neon glow in the background.
A solitary wanderer stands atop a textured basalt rocky ridge, observing a distant cityscape of sleek steel towers mirrored in a calm water surface under cool gray and blue lighting.
Romantic couple kissing inside a car at dusk, illuminated by warm interior light with soft glow and intimate atmosphere.
Oil painting of a 1920s New York street with a young newspaper girl holding a newspaper on a wet sidewalk at early evening, rendered in Rembrandt-inspired style with warm streetlight reflections and vintage vehicles.
Oil painting of a prehistoric Stegosaurus with detailed, realistic skin texture in the style of 19th-century scientific illustrations.
A fantasy landscape featuring elegant elven-style pavilions with moss-covered roofs suspended over a calm canyon river surrounded by tall cliffs and blooming pink trees at twilight.
Portrait of Amane Kanata with blue hair, glowing neon flower on chest, and psychedelic luminous accents on dark background
A lone traveler stands at the base of a towering black monolith covered in glowing blue inscriptions in an alien desert of deep purple sand under a stormy sky with lightning.
Emo woman with black hair and blue eyes wearing a black oversized sweater featuring a skull design, ripped black leggings, and shiny black platform shoes, posed dynamically on the floor with dark makeup and red lips.
A neo-noir style ethereal portrait featuring a person silhouetted by venetian blind shadows, with cigarette smoke tendrils illuminated by neon rim light and film grain effects.
A fantasy digital painting of a large blue castle perched on a rocky cliff surrounded by steep cliffs and rock formations, illuminated by warm sunset light with a mysterious figure standing on a nearby ledge.
A silhouette of a solitary figure in a dark, fog-filled room illuminated by soft volumetric light through an architectural window frame, evoking isolated emotion.
A highly detailed sand traveler dressed in tattered robes and a red keffiyeh stands on a cliff on an alien desert planet with multiple moons in the sky, holding an ornate staff.

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