Fluentprompts

We read every Stable Diffusion (SD3 / SDXL) prompt guide so you don't have to.

Paste your prompt below - we'll rewrite it using Stability AI's official best practices.

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What Stable Diffusion actually rewards

We pulled this from Stability AI's official guidance and what works in production. The short version:

  • Use weights sparingly.
  • Use negative embeddings (EasyNegative, BadHandV4).
  • Include quality tags for SD1.5/SDXL ('masterpiece, best quality, ultra detailed').
  • Use ADetailer for faces.
  • SD3 prefers descriptive prose, fewer artist names.

Before you hit send, check:

  • Did you use weights sparingly?
  • Did you use negative embeddings (EasyNegative, BadHandV4)?
  • Did you include quality tags for SD1.5/SDXL ('masterpiece, best quality, ultra detailed')?
  • Did you use ADetailer for faces?
  • SD3 prefers descriptive prose, fewer artist names?

Common mistakes we fix automatically

  • Avoid
    Don't stack >3 nested parens.
  • Avoid
    Don't generate SDXL at 512² resolution.

Ready to rewrite for Stable Diffusion?

Frequently asked questions

Which versions of Stable Diffusion (SD3 / SDXL) does this support?
We support sd-1.5, sdxl, sd-3, sd-3.5, sdxl-turbo. We apply the prompt patterns Stability AI recommends for each, so the rewrite is tuned to the version you're using.
Is my prompt stored or used for training?
No. Prompts are sent to the rewriter, scored, returned, and discarded. We don't train on them and we don't keep them around.
Do I need to know prompt engineering to use this?
Nope. That's the point. Paste what you have, click Rewrite, get back a version that follows Stability AI's official guidance.
What makes this different from Stable Diffusion (SD3 / SDXL)'s own "improve prompt" feature?
Built-in optimizers use the model's own preferences. Ours is built on Stability AI's official documentation and patterns that consistently produce better results in production. We keep rewrites inside the length window Stable Diffusion (SD3 / SDXL) responds best to.

Optimizing for a different AI?