Stable Diffusion WebUI

Usually called A1111 after its author's handle, this Gradio-based browser app became the reference front end for running Stable Diffusion checkpoints on a home GPU. It handles txt2img and img2img, inpainting and outpainting, the Hires fix pass, X/Y/Z parameter grids, prompt weighting and mid-generation prompt edits, LoRA, embeddings, checkpoint merging, and an Extras tab with GFPGAN, CodeFormer, ESRGAN, and SwinIR upscalers. Each PNG stores its generation settings so the image can restore them later, and a REST API plus a huge extension ecosystem let other tools drive it. Model support runs from SD 1.x and 2.x through SDXL, with Stable Diffusion 3 added in 1.10. Setup uses webui-user.bat or webui.sh with Python 3.10 or 3.11 and git; NVIDIA is the recommended path and cards with 4 GB can work, with guides for AMD, Intel, and Apple Silicon. Code is AGPL-3.0, and every checkpoint keeps its own license. The last tagged release, 1.10.1, came out in February 2025, and newer dev branch commits are mostly install and compatibility fixes, so it fits SD 1.5 and SDXL workflows better than the newest model families.