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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.

zhongfenghuaStyle_FLUX_ Lora | 厚涂笔触_FLUX版_ Lora v1.0
Extreme close-up of a person with ashy skin wearing aviator goggles with colorful reptilian lenses, bright green lipstick, long black hair with vibrant green streaks, and blue ribbons, surrounded by neon bokeh light effects.
A pale-haired gothic sorceress clad in detailed black and gold armor wielding a rune-inscribed sword, standing on rocky terrain before a colossal obsidian dragon with glowing crimson eyes, set against a pink and purple ethereal sky.
A girl with folded ponytail wearing a white dress with Juliet sleeves and white strappy heels sits calmly on a wooden bench next to a fierce black dragon, illuminated by dappled sunlight filtering through surrounding foliage.
Nova Furry XL Illustrious v6B
Stormtrooper outfit v1
She-Venom (Illustrious) v1.0
Ant King Beru Solo Leveling IL / PD / XL-GMR Ant King Beru Pony-GMR
Fusor's Cute-sor Style II [Illustrious] v1.0
RadSister Pony
Toadette (Super Mario) - [Anima/IL] Illustrious
Fire Human | Fantasy Fire Human | Ver 2.0
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.
Get inspirations

Made on Diffus

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

A grotesque humanoid creature with elongated limbs and a large bulbous head leans forward emerging from a circular white futuristic machine in a minimalist white room lit by diffused daylight.
Watercolor painting of an elderly Black man wearing headphones and a light-colored jacket, sitting on a subway bench with an introspective expression.
A bold portrait of a Black woman with voluminous afro hair passionately singing into a vintage silver microphone, wearing large red hoop earrings and a black top against a terracotta background.
A girl with black medium messy hair and glasses reading a book in her messy bedroom, illuminated by soft natural lighting.
Photorealistic close-up portrait of a highly detailed alien woman with geometric skull and sharp features set in a cinematic film still style.
Realistic street art mural on a white brick wall showing a black silhouette in a suit holding a red balloon, observed by a man standing nearby.
A synthetic angel stands on a cracked obsidian plinth in a ruined sanctuary flooded with overgrowth, featuring golden crystalline wings and a glowing halo at dusk.
A sunset over Italian mountains with a crystal lake surrounded by autumn foliage and blooming pink flowers, a quaint village perched on cliffs above tranquil waters.
Four witches sitting around a glowing fire surrounded by tall blue mushrooms shaped like a crescent moon under a starry night sky.
Close-up of a high-detail horror-themed mechanical skull with glowing eyes, sharp jagged teeth, and a cracked blue metal mask against a red background.
A mysterious fantasy creature composed of translucent water-like tentacles rises in a floral-filled town square with old buildings and a person facing it.
Close-up portrait of a young Asian woman with striking yellow eyes, dark tousled hair, and a translucent orange-red scarf partially covering her face.
A surreal depiction of Little Red Riding Hood rendered in a fractured stained-glass Cubist style, showing a girl in a red cloak within a dense forest with geometric shard divisions.
A red armored warrior with flowing red hair stands dramatically on a cliff edge holding a glowing sword, with a dark fantasy village visible in the mist ahead.
Close-up portrait of a young woman with pale skin, short ginger hair adorned with small white daisies, natural freckles, and soft natural lighting with a shallow depth of field effect.
Portrait of a boy with pale skin and trimmed hair wearing a golden crown and green robe, partially obscured by a large green banana leaf against a red background.
Sunlit ancient courtyard with earth-toned textured walls, terracotta jars, patterned rug, woven cushions, and wooden ceiling beams.
A young medieval princess with long pale blond hair sleeps serenely on an ornate bed in a dusty castle room filled with antique furnishings, moonlight casting an ethereal glow.
A cheerful young Victorian factory woman in simple work dress and shawl, smiling while seated on industrial factory steps with tea nearby, depicted in kaoYada art style with natural lighting.
A colossal wrecked frigate grounded near snowy cliffs beside a traditional East Asian temple with glowing warm lights, under a moody overcast sky in winter.
Hyper-realistic half-body portrait of a young female space pilot with pale skin and intense blue eyes, wearing a detailed high-tech white spacesuit and helmet, set against a starry space background.
A miniature blue whale, wearing a dark formal suit jacket, leans against a textured stone wall holding a bouquet of dried roses, illuminated by matte turquoise lighting with tilt-shift macro effect.
Hyper-realistic oil painting of a young Victorian girl in a cream dress standing on a foggy London cobblestone street looking up at a towering brass clockwork robot with glowing orange eyes under warm gas lamp lighting.
Papier-mâché sculpture of a girl with short white hair crouching and reading a book, crafted from newspaper pieces with a textured collage effect under soft diffused light.
A majestic wolf stands on a cliff at sunset, featuring a dreamy double exposure effect that reveals a misty forest and glowing sun within its silhouette, enhanced by expressive oil brushstrokes and cinematic lighting.
Highly detailed futuristic cyborg clad in reflective segmented steel armor with glowing red core and eyes, set against a dark rocky mountainous background under twilight sky.
A female knight in gleaming silver armor stands gracefully on water surrounded by pink spring blossoms, holding an enchanted sword and wearing a flowing cape.
Minimalist black and white sketch of an ethereal young maiden wearing a sheer flowing dress standing among ancient stone ruins.
A luminous mermaid with flowing silver hair and bright blue eyes emerges from glassy Arctic waters, gazing at vibrant green, violet, and turquoise Northern Lights above icy glaciers.
A delicate Chinese female face with closed eyes surrounded by intricate flowing golden floral designs on a black background.
Elegant woman silhouette standing on a windswept shore surrounded by flying seagulls, depicted in a pastel-colored modern illustration style.
A world suspended between two inverted cities, with radiant marble spires floating above in golden mist and dark, inverted ruins below under a dramatic cloudy sky.
Black and white photograph of a small ghostly figure with glowing eyes wearing a hooded cloak, sitting on a tiled floor in a cracked doorway under a twisted tree in a dark, eerie setting.
Flat vector illustration of a thunder goddess girl with lightning horns and yellow glowing eyes, standing confidently before an old TV with electric sparks surrounding her.
Young female model posing dynamically in white sweatshirt and bright orange cargo pants with metallic chains, set against a fluorescent green gradient background with neon green organic shapes, featuring a floating white Nike Air Max sneaker with a shadow, and bold white text on the right.
A surreal digital portrait of a person with spiky black hair and a hypnotic red and black spiral pattern covering their face, set against a white background with a bold red circle.
A highly detailed anthropomorphic dog with shaggy brown and gray fur wearing a dark knit beanie with pompom, a dirty green jacket, dark pants, and oversized dirty sneakers standing on a wet urban ground with blurred city buildings in the background.
Fantasy warrior woman with flowing red hair, wearing a fur cloak and leather armor, adorned with tribal tattoos and holding a sword, standing beside a bear.
Night scene of train tracks leading to a glowing neon triangle tunnel with fog and reflections on wet rails
Dark, moody digital fantasy artwork showing an impossible architecture of melting geometry with spiral staircases and glowing windows in a boundless white void, featuring a lone silhouetted figure.

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