FLUX.2 Klein 9B Outpaint

Extend a picture on any side, and FLUX.2 Klein 9B paints the new area with Pixaroma's PixaOutpaint LoRA. Your image goes back on top. Only the new area and a thin strip along the old edge change.

How to use it

1. Load your image.

2. Pick a ratio, or drag the orange handles out. The small button next to the ratios flips portrait and landscape.

3. Optional: describe the new area in What goes there, after the first sentence.

4. Press Run.

What you need

• AusBoss nodes 2.5.0 or newer. Already have them? Update first.

• The Klein 9B models, the PixaOutpaint LoRA and the caption model:

  • flux-2-klein-9b-int8-convrot.safetensors → models/diffusion_models · 9.43 GB

  • qwen_3_8b_fp8mixed.safetensors → models/text_encoders · 8.66 GB

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

  • pixaoutpaint.safetensors → models/loras · 127 MB

  • qwen3vl_8b_int8_convrot.safetensors → models/text_encoders · 9.35 GB (it only writes the description)

• The sample picture is in sample_inputs.zip. Put it in ComfyUI/input, or load your own image.

Tips

• Keep the first sentence in What goes there. It holds the LoRA's trigger. Without it the new area can come out blank.

• Crop out edges that confuse it. Noise, a frame line or a busy strip along the edge of your picture can make the new area come out strange. Drag the blue handles on Image Crop + Rotate + Pad inward to cut those edges off first.

• Tight portraits: say what's below after the first sentence, like "the rest of her body".

• A big pad can grow a second hand or face near your picture's edge. If it does, extend in two runs so your picture fills at least half the canvas each time.

• The result is about 1.6 MP, whatever size your picture is. A 5000 px photo comes back about 1120 × 1488.

• Leave Align at 1. A bigger Align adds pixels on the right and bottom, even on a side you didn't pad.

• About 8 seconds a picture on an RTX 5090 once the models are loaded, 4 seconds for a new seed.

Credits

FLUX.2 [klein] 9B is by Black Forest Labs, under the FLUX Non-Commercial License: non-commercial use only. The INT8 file is a community conversion by Winnougan; the text encoder and VAE are Comfy-Org's repackage. PixaOutpaint is Pixaroma's experimental outpaint LoRA for Klein 9B (Pixaroma/experimental_loras, MIT). The caption model is Qwen Image 2.1's Qwen3-VL 8B text encoder, repackaged by Comfy-Org, under the Qwen Research License (non-commercial use only).

v1.1 (2026-09-30): the padding follows your picture, the seam blends in, and tight portraits stopped getting a second face in my tests. v1.0 (2026-09-25): first release.

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