Extend a picture on any side, or turn it first, and FLUX 3 Image Klein paints the new area. A slider shows the picture before and after.
The LoRA it uses: FLUX 3 Image Klein Outpaint LoRA. Also for FLUX 3 Klein: Single & Multi-Image Edit.
How to use it
Load your image.
Pick a ratio, or drag the orange handles out. To straighten a crooked picture, turn it with the round handle.
Optional: finish the sentence in What goes there.
Run.
Your original pixels are put back on top at the end, so only the new area is painted.
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.
My outpaint LoRA: flux-3-image-klein-outpaint.safetensors → models/loras · 161 MB. If the run stops at a red LoRA Loader, this file is missing.
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, Text encoder and Caption model.
Tips
Pull out about your picture's own size at most, on one side per run. For more, run again on the result.
Leave the fill and the feather alone. The LoRA learned a hard gray #808080 edge, so the Fill stays #808080 and Feather stays 0.
Not happy with the new area? Run it again. The seed changes each run. In my trial runs, one in 18 drew part of the picture a second time, and at 1.5 one in 20.
Say what should be there only when you need to. What goes there tells the text encoder what else to put in the description of your picture.
About 8 seconds a run on an RTX 5090.
The LoRA is what keeps your picture in place. Without it FLUX 3 often zooms in or slides the picture instead of extending it: 36 of 40 runs in my test of the official template graph. The LoRA, its test numbers and its license are on the Hugging Face repo.
On Qwen Image 2.1 instead: Qwen Image 2.1 Outpaint and Qwen Image 2.1 Rotate + Outpaint.
Credits
FLUX 3 Image Klein is by Black Forest Labs, under the FLUX Kommunity License: use of the pictures you make is covered by its rules for outputs (section 2), so read it if you plan to use them commercially. The outpaint LoRA is mine, a modified version of FLUX 3 Image Klein shared under the same license. 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.
