Quick Answer: Write one style block (flat vector, two or three named colours, white background, centred composition, "absolutely no text") and paste it unchanged in front of every subject. Generate each image in the ChatSlide AI Media Studio with GPT Image 2 at 1:1 for icons and 16:9 for slide headers. The fixed block is what makes 30 illustrations look like one set.
Navy line art, light blue fills, white background, no text. One style block, one subject line.
Why AI Illustrations Usually Don't Match
Generate ten images with ten different prompts and you get ten styles: one glossy, one sketchy, one with a gradient sky. For a slide deck, a course or a report, that inconsistency looks worse than no illustration at all.
The fix is to separate style from subject. The style lives in a block of text you never edit. Only the subject sentence changes. The model then has the same instructions for line, colour, background and composition every time.
The Style Block
Flat design infographic illustration, clean modern vector style, navy blue and
indigo line art with soft light blue fills, pure white background, minimal
geometric shapes, professional corporate look, centred square composition.
ABSOLUTELY NO TEXT, no words, no letters, no numbers, no labels anywhere.
No real brand names or logos.
Subject: <one sentence>
What each part does:
- "Flat design … vector style" removes photo textures and 3D shading.
- Named colours keep the palette fixed. Two or three colours is enough; more and the set drifts.
- "Pure white background" makes every image drop onto a slide or page without a box around it.
- "Centred square composition" gives every image the same weight and margins.
- "No text" matters most. Models love adding fake labels to diagrams. You will add real labels yourself on the slide, in your language, where they can be edited.
Step by Step in ChatSlide
Step 1: Open the AI Media Studio
Go to app.chatslide.ai/generate-media and stay on Image.
Step 2: Paste Style Block + Subject, Pick Ratio and Model
Choose 1:1 for icon-style illustrations or 16:9 for slide-wide headers, then OpenAI → GPT Image 2.
GPT Image 2 follows long style instructions closely. It needs the Ultimate plan; 34 credits per image.
Step 3: Generate, Download, Repeat With the Next Subject
Results are saved to your Resources and listed under Recent Generations, so a whole set stays together.
Subject Lines That Work
Write the subject as one concrete scene, with objects the model can draw. Abstract ideas ("data reliability") come out vague; concrete ones ("a wall screen showing a parcel tracking dashboard inside a warehouse") come out clean.
For a supply chain infographic set:
- a factory with two chimneys and a loading bay
- a container ship at sea stacked with containers
- a warehouse with numbered dock doors in a row
- a delivery van on a highway with a route line
- a circular loop connecting all of the above around a globe
- KPI gauges mounted above a parcel packing line
For a training or finance deck, the same pattern: one object or scene per illustration, in the setting where it happens.
Turning an Idea Into a Picture
If you start from a slide title rather than a scene, put the title in the subject but tell the model what to draw:
Subject: an illustration of 'From manual data entry to automated checks', showing
a tired person at a desk of paper forms on the left and a calm person watching a
dashboard of green check marks on the right.
The "no text" rule still applies, so the title guides the scene without appearing in the image.
Infographic Illustrations vs Full Infographics
An infographic illustration is the picture inside an infographic: icons, scenes, a diagram shape. A full infographic also carries numbers and labels. Keep them separate: generate text-free illustrations, then add the numbers on the slide where you can edit them. Generated text inside a diagram cannot be corrected without regenerating the image.
When you do need labels baked in (for example a poster), switch the rule to "all labels in English, clear and legible" and list every label in the prompt. GPT Image 2 handles short labels well. For comic-style pages with dialogue, see the AI comic generator guide.
Keeping a Large Set Consistent
- Store the style block in a text file and paste it, never retype it.
- Generate the hardest subject first. If it works, the style is right.
- Attach your best image with Ref img when a subject drifts.
- Use the same aspect ratio for images that will sit side by side.
- Review the set together in Recent Generations and regenerate the odd one out.
Flat Illustrations for Teams
When several people build decks for one organisation, a shared style block is effectively a brand illustration system. Contact us about Enterprise workspaces with SSO, team billing and shared templates.
FAQ
What is flat design illustration?
An illustration style with solid colours, simple geometric shapes and no realistic texture, depth or shading. It is common in apps, corporate decks and infographics.
How do I stop AI from adding text to illustrations?
Put "ABSOLUTELY NO TEXT, no words, no letters, no numbers, no labels anywhere" in the style block, in capitals, and keep the subject free of words you want drawn.
Which aspect ratio should I use?
1:1 for icons and grid layouts, 16:9 for full-width slide images, 9:16 for phone and story formats.
Can I match my brand colours?
Yes. Replace the colour names in the style block with your brand colours described in words, such as "deep teal line art with pale mint fills."
Is there a free option?
Gemini 3.1 Flash Image is on the free plan (10 credits). GPT Image 2 follows long style blocks more faithfully and requires the Ultimate plan.
Build your first set: open the AI Media Studio or explore the AI image generator.