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A negative prompt lists what you do not want in the output. It is a separate field from the main prompt, and it is the most direct control you have over recurring artifacts.

Which models have a negative prompt field

The Illustrious and Pony checkpoint families are SDXL-based and take negative prompts.

How to write one

List things. The field is not read as a sentence, so instructions do not work in it.
Keep it short. A very long negative prompt constrains the image in ways you did not intend, since every term pushes the generation somewhere.

Limitations

  • A negative prompt reduces the likelihood of something appearing without forbidding it. If an artifact keeps recurring, changing the base model or adding a LoRA usually works better than adding more negative terms.
Last modified on September 14, 2026