Say what to change, and FLUX 3 Image Klein edits your picture. A slider shows the picture before and after.

How to use it

1. Load your image.

2. Say the change, then what stays the same: "Change her black jacket to a red leather jacket. Keep her face, her hair, her pose and the street exactly the same."

3. Run.

What you need

• ComfyUI 0.41.0 or newer. That is the first version with FLUX 3.

• AusBoss nodes 2.13.0 or newer. In ComfyUI-Manager, search "AusBoss". Already have them? Update first.

• The FLUX 3 Image Klein files. They are on Hugging Face behind a license click: open black-forest-labs/flux-3-image-klein-comfy, sign in and accept, then these links work.

  • flux3_image_klein_sd_int8_convrot.safetensors → models/diffusion_models · 5.83 GB

  • qwen3vl_4b_int8_convrot.safetensors → models/text_encoders · 4.86 GB

  • flux2-vae.safetensors → models/vae · 336 MB

These are the INT8 files, the same ones ComfyUI's own FLUX 3 template uses. Black Forest Labs says they run on cards with 8 GB. The full-size BF16 files are on the same page for bigger cards (11.1 GB and 8.88 GB): pick them in Diffusion model and Text encoder.

Tips

• Say what stays. End the request with something like "Keep her face, her clothes and the background exactly the same." With that line my test edits moved the picture a median of about 1 px. Without it a big change can do more than you asked: "make it snow" turned a night picture into day.

• Ask for the change, don't describe the whole picture. ComfyUI's template suggests a full description of the result. In my tests that redrew the picture, with a new pose and framing, up to 202 px off.

• A style change can still move it. A watercolor or another style change can move the picture by tens of pixels, so the slider won't line up exactly.

• LoRAs made for FLUX 3 Klein go in LoRA Loader.

• About 6 to 8 seconds a run on an RTX 5090.

On Qwen Image 2.1 instead: Qwen Image 2.1 Edit.

Credits

FLUX 3 Image Klein is by Black Forest Labs, under the FLUX Kommunity License: free commercial use for individuals and companies with annual revenue under $5M. Larger companies need a license from Black Forest Labs. The files are Black Forest Labs' own ComfyUI versions.

v1.0 (2026-10-15): first release.

Questions or bugs: GitHub issues or the comments here. Videos on YouTube @ausbossdev. More from me on X @Zanzibased and GitHub.