Understanding the seed and reproducibility

The seed is the starting number the model uses to generate an image. It sits behind every render on the Generate tab and decides how much a result stays the same or changes between generations.

1. What a seed does

The same prompt combined with the same seed, on the same settings (checkpoint, format, style), produces the same image every time. Change the seed and you get a different image from the identical prompt.

2. Random by default

The Random seed checkbox is on by default, so pressing Generate repeatedly with the same prompt gives a fresh variation each time. The seed actually used is remembered even while this stays checked.

3. Lock a seed to refine

Uncheck Random seed and a Seed field appears, already filled with the value from your last generation. With it fixed, adjust the prompt (lighting, outfit, a small detail) and regenerate to see the effect of that change alone.

4. Reproduce an image exactly

To recreate a past result, use the same prompt, the same locked seed and the same settings. The fastest way is from the Gallery: open a past image and click Reuse, it reloads the exact prompt, seed, character and style into the Generate tab.

Combine seed locking with Images per run to compare several unlocked variations before settling on one to refine. See also the Prompting guide.