Stable Diffusion is an open-source AI image generator developed by Stability AI. It uses a latent diffusion model to convert text prompts into high-quality images. The tool was first released in 2022 and has since become the most widely used open-source image generation model. It is available for free download on Hugging Face with over 90,000 community-built models.
The latest version is Stable Diffusion 3.5, available in three sizes Large, Large Turbo, and Medium. It generates images up to 1 megapixel resolution with improved prompt adherence and text rendering. Core features include text-to-image, image-to-image, inpainting, outpainting, and ControlNet support. Users access it through popular interfaces like Automatic1111 Web UI, ComfyUI, or Fooocus.
Stable Diffusion runs locally on your own GPU or through cloud-based services like DreamStudio. The Stability AI API allows developers to integrate image generation directly into apps and workflows. It supports LoRA training for custom model fine-tuning on specific styles or subjects. NVIDIA GPUs with 8 GB+ VRAM are recommended, though Apple Silicon and select AMD cards also work.
The tool is free to self-host under the Community License for individuals and businesses earning under $1 million per year. Paid options include DreamStudio credits at $10 per 1,000 and pay-as-you-go API access. It is best suited for developers, digital artists, and content creators who want full control over their pipeline. Enterprises above the $1M threshold require a separate commercial license from Stability AI.
