Complete guide to Stable Diffusion
Getting started
Stable Diffusion is an open-source model you can run on your own computer or through cloud services that offer it. For local use, the most widespread option in 2026 is ComfyUI: download the portable build for Windows (or clone it on Linux/Mac), install the ComfyUI Manager, place a model file (.safetensors) in the checkpoints folder, and click "Queue Prompt" to generate your first image. You need at least 8GB of VRAM for basic workflows, though 12GB or more is recommended for comfortable work.
Use cases
Image generation with full technical control
Unlike closed services, you can adjust every step of the process (model loading, prompt encoding, sampling, decoding) visually.
Privacy and offline work
Since it runs on your own hardware, your prompts and images never leave your machine, useful for projects with confidentiality requirements.
Using community models and styles
Download base models (SDXL, Flux) and LoRAs trained by the community to achieve very specific styles without training anything yourself.
Integration into your own applications
Being open source, it can be integrated directly into your own workflows or products without depending on a paid external API.
Advanced setup
- Install ComfyUIDownload the portable build, install the extensions Manager, place the model checkpoint in the corresponding folder, and build your workflow by connecting nodes visually.
- Basic SDXL workflowThe standard chain is: load checkpoint → encode the prompt (twice in SDXL) → create the empty latent image → sample (KSampler) → decode VAE → save image. It covers most generation needs.
- Hardware requirements8GB of VRAM minimum for basic workflows; 12GB or more recommended for comfortable work, especially with newer models like Flux.
- SDXL vs newer modelsSDXL natively generates at 1024x1024 with better detail than the original Stable Diffusion versions; newer models like Flux offer even more quality at the cost of higher hardware requirements.
Tips
- Start with the basic SDXL workflow before complicating your ComfyUI graph with advanced nodes: it covers 90% of typical generation needs.
- Use community LoRAs instead of training your own model from scratch when you're after a style that already exists: it saves a huge amount of time and resources.
- If your GPU has limited VRAM, try SDXL first before heavier models like Flux, which require more memory.
- Save your working ComfyUI workflows as reusable templates, instead of rebuilding the node graph every time.
FAQ
Is Stable Diffusion free to use?
Yes, it's open source and free to run on your own hardware. The only real cost is your GPU or, if you use a cloud service that hosts it, that service's price.
Do I need a powerful graphics card?
At least 8GB of VRAM is recommended for basic workflows, and 12GB or more to work comfortably with newer models.
What exactly is ComfyUI?
It's the most widely used visual node interface in 2026 for running Stable Diffusion and related models locally, giving access to every internal step of the generation process.
Can I use the generated images commercially?
It depends on the specific license of the model you use; most base models allow commercial use, but you should check the license of each community model and LoRA before serious commercial use.
Based on ComfyUI documentation and technical guides from the Stable Diffusion community.