
Seed in Stable Diffusion is a starting point or initial input that is used to generate an output. Specifically, it is a value or set of values that is provided to the generative model to initiate the generation process. Seeds are used to ensure that the generated output is reproducible, which means that the same input will always generate the same output.
You don't need to come up with the number yourself because it is randomly generated when not specified. The rules for the Stable Diffusion system to identify different input Seed are very simple.
Before learning how to use Stable Diffusion Seed, we must remember such a rule:
Same prompt + same seed = same image
So based on different prompts and seeds, we have three different ways of using it
If you want to generate the same image, you can use a same prompt + same seed to achieve it

Anime girl generated by Stable Diffusion

Anime girl generated by AnimeGenius
We used the same prompt and seeds in the two images above, keeping the settings exactly the same and returning the same good results in two different AI generators.

Red hair girl

Blue hair girl

Pink hair girl
As we can see, using the same seed and just modifying the hair color part of the different prompt words, you will get highly consistent image sequences. You can use this little trick to create the series of images you want

Seed: 3308202122

Seed: 3500307759
Look at the two images above, they together depict a cute girl reading a book, I used the exact same prompt and different seeds. So I got two different pictures
In AnimeGenius, You can view pictures created by users using AI in the Explore page. Click on the image to view the prompt and and seeds they used

