Describe your subject, pick a style, and get both a prompt and a matching negative prompt, the two-field format most Stable Diffusion interfaces use.
Prompt
Negative prompt
What Is a Stable Diffusion Prompt Builder?
A Stable Diffusion prompt builder generates both the main prompt and a matching negative prompt, since most Stable Diffusion interfaces (like Automatic1111 or ComfyUI) use two separate fields, one for what you want, one for what to avoid, rather than a single combined string.
The tool above is free, runs entirely in your browser, and doesn’t send your input anywhere.
How to Use This Free Stable Diffusion Prompt Builder
- Describe what you want to see.
- Pick a style.
- Click “Build Prompt,” then copy the prompt and negative prompt into their matching fields in your Stable Diffusion interface.
A Note on Weighting Syntax
Many Stable Diffusion interfaces support emphasizing specific words using parentheses or weighting syntax
like (keyword:1.3), but exact support varies between interfaces and models, check your
specific tool’s documentation before relying on it.
Frequently Asked Questions
Is this Stable Diffusion prompt builder free to use?
Yes. It’s completely free, has no sign-up, and runs in your browser.
Why does it generate two separate boxes?
Stable Diffusion interfaces typically have a dedicated negative prompt field, separate from the main prompt, this matches that workflow.
Can I customize the negative prompt?
Yes, edit it directly, or add specific issues you keep seeing in your results.
Does this work for all Stable Diffusion versions?
The prompt format works broadly, but exact syntax support (like weighting) can vary between model versions and interfaces.
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