How to Use an AI Image Generator Step by Step
A clear, practical img.now guide to how to use an ai image generator step by step.
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If you have never used an AI image generator before, this guide walks you through the full process from writing your first prompt to downloading your finished image.
Quick answer
Using an AI image generator involves four steps: write a short text description of the image you want, choose a style and frame shape, click generate, and then refine the result if needed. The whole process takes about a minute once you know what you are doing. Start at the AI image generator and you can have your first image in under two minutes.
Step 1: Write your prompt
The prompt is the text description you type to tell the tool what to make. It does not need to be long or technically precise - A few words describing the subject, setting, and mood is enough to start.
A simple structure works well for beginners: name the subject first, add where it is or what surrounds it, then describe the feeling or look you want. For example, "a tabby cat sitting on a wooden windowsill, rainy day outside, soft warm light" gives the tool enough to work with.
For a deeper look at what makes a good prompt, the guide on how to write AI image prompts breaks down each part with examples you can adapt.
Step 2: Choose a style
Most AI image generators offer a set of style options alongside the text prompt. Styles define the visual language of the output - Whether it looks like a photograph, a painting, a flat illustration, a sketch, or something else.
Pick a style that matches what you need the image for.
| Use case | Suggested style |
|---|---|
| Blog post or article header | Photo or painterly |
| Social media post | Photo, flat illustration, or bold graphic |
| Presentation slide | Clean flat illustration or minimal photo |
| Personal creative project | Any - Pick what appeals to you |
| Product image concept | Photorealistic |
| Character or mascot | Illustration or cartoon |
If you are not sure, start with a photo style. It is the most flexible and tends to produce results that work across many uses.
Step 3: Set the aspect ratio
The aspect ratio is the shape of the image - Square, wide landscape, or tall portrait. Choose it based on where the image will be used, because the shape affects how the scene is arranged.
A square works for most social media feeds and general use. Wide (16:9 or 3:2) suits banners, headers, and desktop wallpapers. Tall (9:16 or 4:5) suits phone wallpapers, stories, and portrait-oriented posts.
The best AI image aspect ratios guide maps common use cases to frame shapes if you want a quick reference before generating.
Step 4: Generate and review
Click generate and the tool will produce an image in a few seconds. Your first result may land exactly where you wanted, or it may need adjustment. Either way, reviewing the output critically is the next step.
Look at the main subject first: is it correct and clearly defined? Then check the mood, the style, and whether anything unexpected appeared in the frame. A common result from early generations is an image that has the right subject in the wrong setting, or the right setting in the wrong mood.
If something is off, change one thing in your prompt and generate again. Changing everything at once makes it hard to know what made the difference.
Step 5: Refine your prompt
Refinement is where most people spend the most time, and it is worth thinking of it as part of the normal process rather than a sign something went wrong. Each generation teaches you what the model responds to.
If the mood is off, try changing one or two mood words. If an object you did not want keeps appearing, you can steer the tool away from it by using negative prompts, which let you list things to exclude. If the style is not quite right, try naming it more specifically - "oil painting" instead of "painterly," or "product photo on white background" instead of "clean photo."
Generate a few versions and compare them before settling on a result.
Step 6: Download and use your image
Once you have a result you are happy with, download it. Most tools let you choose the file format. PNG preserves full quality and is best for anything that will be edited further or printed. JPEG works for web sharing where file size matters.
If your image needs further editing - Removing a background, resizing for a specific platform, or increasing the resolution - Img.now has dedicated tools for each of those tasks. The background remover and image upscaler are the most commonly used next steps.
Checklist
- Write a prompt with a clear subject, setting, and mood
- Choose a style that fits the final use
- Set the aspect ratio before generating
- Generate your first image and review it critically
- Change one part of the prompt at a time when refining
- Use negative prompts if unwanted elements keep appearing
- Download as PNG for editing or printing, JPEG for web sharing
- Check the tool's terms if you plan to use the image commercially
Example prompts
These follow the subject, setting, mood, style pattern and are good starting points for a first generation.
A small coffee shop interior, morning light through large windows, warm and quiet mood, soft photo style, wide landscape frame
An aerial view of a winding river through a green valley, golden hour, calm and scenic, painterly illustration style
A close-up of a fresh lemon slice on a white surface, clean studio light, bright and minimal, product photo style
Run one of these, see the result, then adjust a single word and generate again to get a feel for how changes affect the output.
FAQ
Do I need to sign up to use an AI image generator?
Many tools offer a free trial without an account, but creating a free account usually unlocks more generations and higher-resolution downloads. Check the tool you are using to see what is available before and after signing in.
How specific does my prompt need to be?
Specific enough to name the subject and give some direction on style or mood. A two-sentence prompt is usually plenty to start. Very short prompts ("a dog") give the model too much freedom. Very long prompts can cause the model to ignore parts of them. Aim for something in between.
Why does my image look different from what I described?
AI image generators interpret prompts rather than execute them literally. Words like "dramatic" or "cozy" mean different things in different contexts, and the model draws on patterns from its training to interpret them. If the result is off, try more specific wording - Name the exact lighting, the exact setting, or the exact object you want rather than describing a feeling alone.
Can I generate the same image twice?
Not exactly. Each generation starts from a random starting point, so two runs of the same prompt will produce similar but not identical images. If a result lands well, download it immediately rather than expecting to reproduce it exactly later.
What is the difference between style and prompt?
Your prompt describes what is in the image - The subject and setting. The style setting describes how it looks - Whether it resembles a photo, a painting, or an illustration. Both together shape the final result. See the full text to image guide for a deeper look at how they work together.
This guide is general information to help you create better images. For rights and commercial questions, read the copyright and image rights notes.