AI Image Prompt Generator: Free Prompt Builder

Describe your scene, choose its look, then copy a finished prompt. Switch between natural language for Flux, GPT Image, Imagen and Midjourney, or tags for Stable Diffusion and its fine-tunes.

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The building blocks of an image prompt

Build the picture around one subject and one action. Each extra field should answer a different visual question. If your subject is a lighthouse keeper climbing stairs, describe the stairs and the light before adding decorative adjectives. That gives you a scene you can revise deliberately.

A lens description is a creative instruction, not a promise of optical accuracy. Keep it when you want a photographic treatment and remove it when it adds nothing to a flat illustration. Empty fields disappear from the assembled prompt.

Choose tags or natural language for your model

Tag-style prompts suit SD 1.5, SDXL and their fine-tunes. These models use CLIP text encoders and read prompts in chunks of 75 tokens. Earlier terms tend to carry more weight, so place the essential subject and action before minor texture details. The word count above is not a token count.

Pony expects score_9, score_8_up, score_7_up first. Illustrious and NoobAI use booru-style tags and respond to masterpiece, best quality, absurdres. Select the matching family to add its prefix. The builder lowercases and removes repeated tags; it does not look up or invent tags for your subject.

Natural-language sentences suit Flux and other models with a T5 or LLM text encoder. Use that format for the prose workflow described in the Flux prompting guide. For Midjourney, the Midjourney prompt generator adds aspect ratio and other parameters after your description.

How to use the image prompt generator

1. Replace the example subject and action with a specific scene. Use concrete nouns such as brass lantern and wet stone steps.
2. Choose one medium, then add lighting and a viewpoint that fit it. Read the scene aloud to catch conflicting instructions.
3. Choose natural language or tags. In tag mode, choose the model family and review the prefix before copying.
4. Generate an image in your chosen app, then change the field that corresponds to the result you want to adjust.

If a Stable Diffusion interface needs a different weighting syntax, use the prompt weight converter after deciding which detail needs emphasis. First make sure the ordinary wording clearly states that detail.

Keep the positive prompt focused

Avoid asking for an oil painting, a studio photograph and a flat vector drawing in the same scene unless that mixture is deliberate. Likewise, ten near-identical adjectives make it harder for you to identify which instruction matters. Replace vague praise with a material, position, color or light source you can actually inspect.

Describe what you want to see in the positive prompt. For models that support exclusions, move unwanted defects into a separate negative prompt instead of mixing them into the subject description. Add an exclusion after you observe the problem, and compare the next result before expanding the list.