How to use the AI Image Prompt Generator
- 1. Describe the subjectSay what's in the picture and where it is.
- 2. Choose the lookPick style, lighting, shot, mood, colours and aspect ratio, and list what to avoid.
- 3. Copy a versionUse the general prompt, the Midjourney-style one or the Stable Diffusion version.
What makes a good image prompt
Image models respond best to concrete visual detail: what the subject is, what it's doing, where, the style or medium, the light, the camera framing, the mood and the colours. This generator walks through those in order and writes them three ways, because tools read prompts differently. Chat-based image tools (ChatGPT, Gemini, Copilot, Firefly, Canva) like natural sentences. Midjourney uses comma-separated descriptions with parameters such as --ar and --no. Stable Diffusion apps take a positive prompt plus a separate negative prompt and an image size.
Worked example
With the defaults (a student coding on a laptop at a desk by a window in a small Indian apartment in the evening, as a photograph, medium shot at eye level, warm golden-hour light, calm and focused mood, orange and navy accents, plants and a cup of chai, 16:9), the Midjourney-style version ends with --ar 16:9 --no blurry, distorted hands, watermark, extra text. The Stable Diffusion version suggests 1344 × 768, a common SDXL size for 16:9, with the avoid list as its negative prompt.
Tips and limits
- Generate several images and change one choice at a time: lighting changes the mood more than you'd expect.
- Text inside images is still hit-and-miss; keep it short and check spelling.
- Don't request real people's likenesses, brand logos or copyrighted characters, and check each tool's rules before using images commercially.
- Parameters and defaults change between tool versions, so check the tool's own guide if a parameter is ignored.
Frequently asked questions
Which image tool should I use?
It depends on the look and licence you need. Our AI tools finder lists popular image tools by what they're good at.
Is anything sent to an image AI?
No. The prompts are written in your browser; you paste them into an image tool yourself.
Is the AI image prompt generator free?
Yes. You can open the AI image prompt generator and fill in everything without signing up. When you generate prompts for the first time, we ask once for your name and WhatsApp number; after that it, and every other Uncodemy tool, opens straight away.