PromptSilo

PromptSilo is a free web-based prompt builder for Midjourney, with the basic style, subject, and lighting mixing available without payment. Some features may require creating an account, so treat premium-style additions as optional extras.

It was built for Midjourney, and its output includes Midjourney-specific parameters like --ar for aspect ratio and --stylize for stylization weight. The plain descriptive text works in other generators, but you'll need to strip out the Midjourney-only parameters for DALL·E or Stable Diffusion.

Copy the finished prompt and paste it into Discord using the /imagine command, or directly into the prompt bar if you're using Midjourney's web app at midjourney.com. You'll still need your own paid Midjourney subscription, since PromptSilo only builds the text.

It lets you layer subjects with art styles and lighting presets — typical options include golden hour, neon glow, rim lighting, and studio setups alongside style modifiers like watercolor or cyberpunk. The value is speed: you assemble a structured prompt in seconds instead of hand-writing every descriptor.