FLUX.2 Klein 9B — Ultimate All-in-One ComfyUI Workflow v2.0

90 nodes · 6 pipelines · 12 organized groups · 8GB VRAM compatible

One workflow file. Everything you need. No more switching between different JSON files for different tasks.

6 Pipelines in 1 Workflow

PipelineWhat It Does🎨 F1: Text → ImageStandard txt2img at 1024×1024🖼️ F2: Single-Reference KV EditEdit specific elements while preserving everything else🚀 F3: Face + Pose SwapTake a face from Image A + pose from Image B → combine realistically🎭 F4: InpaintingManual mask or AI auto-masking → regenerate only masked area🔀 F5: Image MergeBlend two images with adjustable ratio✨ RefinerDetail enhancement, lighting correction, skin texture improvement

Built-in Features

• 🧭 NAG (Normalized Attention Guidance) — Negative prompts that actually work on distilled Flux

• 🤖 Florence2 Auto-Masking — Type what to mask ("Segment the shirt") → pixel-perfect mask

• ⬆️ 4x UltraSharp Upscaler — Clean upscaling with detail preservation

• 🔷 Tiled VAE Decode — All VAE decodes are tiled to prevent OOM on 8GB VRAM

• 🔗 2-Slot LoRA Chain — Enhancer LoRA always last, add your own LoRAs in the empty slot

• 📋 Built-in Guide Notes — Download links, prompting tips, and troubleshooting right inside the workflow

Hardware Requirements

• Minimum: 8GB VRAM (RTX 3060/4060/4070 with GGUF Q4 model)

• Recommended: 10-12GB VRAM (RTX 3080/4070 Ti with FP8 model)

• RAM: 16GB+

• ComfyUI: Version 0.9.2 or newer

Models You Need

Diffusion Model (pick one):

• FP8: flux-2-klein-9b-fp8.safetensors → Download

• GGUF Q4 (8GB VRAM): → Download

Text Encoder:

• qwen_3_8b_fp8mixed.safetensors → Download

VAE:

• flux2-vae.safetensors → Download

Upscale Model:

• 4x-UltraSharpV2.pth → OpenModelDB (its free just type 0 and get it)

LoRA:

• klein_9b_enhancer_v2.safetensors → Put in models/loras/
  https://civarchive.com/models/2442399/elusarcas-detail-enhancer-or-flux-klein-9b?modelVersionId=2746136

Custom Nodes (install via ComfyUI Manager):

• rgthree-comfy (Image Comparer)

• ComfyUI-Florence2 by kijai (auto-masking, optional)

• ComfyUI-GGUF by city96 (only if using GGUF models)

How to Use

1. Load the JSON in ComfyUI

2. use comphyui manager to install any missing node. ( critical step )

3. Only the Refiner is active by default — everything else is bypassed

4. To activate a pipeline: right-click its group header → Set Nodes Mode → Always Execute

5. To deactivate: right-click → Set Nodes Mode → Bypass ( or bypass groupe nodes )

6. Read the built-in Note nodes for prompting tips and download links

Prompting Tips

FLUX.2 Klein reads prompts like a novelist, NOT like Stable Diffusion.

Use: Subject → Setting → Details → Lighting → Technical terms

Power words: clean digital file, histogram equalization, gamma correction, studio strobe, shot on Canon EOS R5

Avoid: beautiful, masterpiece, best quality, trending on artstation

For text in images: Put text in quotes → A sign reading "HELLO"

Troubleshooting

• OOM: Already using Tiled VAE. Try GGUF Q4 model if still crashing

• Black images: Wrong text encoder. 9B needs Qwen3 8B, not 4B

• Plastic faces: Make sure enhancer LoRA is active (strength 0.7)

• NAG not working: Install ComfyUI-NAG custom node as alternative

Built and tested on RTX 4060 Mobile (8GB VRAM). If you have issues, leave a comment — I'll help you fix it.

If this workflow is useful to you, please leave a review — it helps others find it.

VERSION HISTORY:

• v2.0 — Initial public release. 90 nodes, 6 pipelines, NAG, Florence2, Tiled VAE.