What Is a Seed in AI Art?

A seed is the number that initializes the random noise an AI image generator starts from. The same prompt with the same seed reproduces the same image; change the seed and you get a different interpretation of the same description. It's the reproducibility knob of AI art.

An image model starts from a screen of random static and cleans it up, step by step, until a picture appears — that is what a diffusion model does. So the static it starts from is part of the recipe, and the seed is the number that decides which static. Seeds let you iterate scientifically: lock the seed and refine the prompt to change one thing at a time, or lock the prompt and roll seeds to explore variations.

Consumer tools often manage seeds invisibly — every click explores a new one — while pro workflows expose them exactly because repeatability turns luck into control. It is also what lets you keep a generated character consistent from one image to the next.