Nano Banana Pro: The Complete Guide to Google's Best AI Image Generator
How to use Gemini 3 Pro Image for website graphics, infographics, and text-heavy visuals.
Google's Nano Banana Pro (officially Gemini 3 Pro Image) launched in November 2025 and immediately became the most talked-about AI image model online. The hype is justified - it's genuinely the best model for generating images with readable text, making it perfect for website graphics.
What is Nano Banana Pro?
Nano Banana Pro is Google's flagship image generation model, built on Gemini 3 Pro. It's the successor to the original Nano Banana (Gemini 2.5 Flash Image) that went viral for its speed and quality.
| Spec | Detail |
|---|---|
| Max Resolution | 4096x4096 (4K) |
| Text Rendering | Best-in-class, multiple languages |
| Reference Images | Up to 14 input images |
| Speed | Quality-focused (slower than Flash) |
| Token Cost | 4,500 tokens |
| Best For | Infographics, menus, posters, charts, diagrams |
The standout feature is text rendering. Previous AI models struggled with legible text - you'd get gibberish or misspelled words. Nano Banana Pro generates crisp, readable text in dozens of languages.
When to Use Nano Banana Pro
Choose this model when your image needs:
Text-heavy content
- Infographics with data labels
- Restaurant menus
- Event posters with details
- Social media quotes
- Diagrams with annotations
- Product mockups with packaging text
Maximum quality
- Hero images that need to look sharp at full-width
- Print materials (4K resolution handles large formats)
- Portfolio pieces
- Marketing collateral
Complex compositions
- Multiple reference images blended together
- Brand consistency across a series
- Character consistency in sequences
When NOT to Use It
Nano Banana Pro uses more resources and takes longer to generate. For simpler tasks, faster models work better:
- Quick social thumbnails → Use Gemini 2.5 Flash
- Photorealistic product shots → Use Imagen 3
- Artistic/stylised illustrations → Use DALL-E 3
- Rapid iteration/experimenting → Use Gemini 2.5 Flash
Prompt Structure for Best Results
Google recommends including these elements:
- Subject - Who or what is in the image
- Composition - How elements are arranged
- Action - What's happening
- Location - Setting and environment
- Style - Visual aesthetic
- Text instructions - Exact text to include
Example Prompts
// Infographic
Create a vertical infographic about coffee brewing methods. Include exactly this text as headers: "French Press", "Pour Over", "Espresso", "Cold Brew". Each section should have a simple icon and 2-3 bullet points. Use a warm brown and cream colour palette. Modern minimalist style.
// Restaurant Menu
Design a single-page dinner menu for an Italian restaurant called "Bella Notte". Include sections: Antipasti, Pasta, Secondi, Dolci. Use elegant serif typography on a cream textured paper background. Include decorative olive branch illustrations in the corners.
// Event Poster
Create a concert poster with the text "SUMMER SOUNDS FESTIVAL" as the main headline, "August 15-17, 2025" below it, and "Victoria Park, London" at the bottom. Sunset gradient background with silhouettes of a crowd. Bold modern typography.
// Social Quote Graphic
Design a square social media graphic with the quote "Done is better than perfect" in bold white sans-serif text, centred. Dark gradient background with subtle geometric shapes. Clean, modern, motivational style.
Text Rendering Tips
Nano Banana Pro handles text well, but these tips improve results:
Do
- Put exact text in quotes:
the text "Your Words Here" - Specify font style: "bold sans-serif", "elegant script"
- Indicate placement: "centred at bottom"
- Keep text under 50 words per image
- Use "legible" or "clear typography" in prompts
Don't
- Include paragraphs of text (breaks over ~50 words)
- Expect perfect spelling on unusual words
- Assume the model knows your brand fonts
Pro Tip: For longer text
Include the full text verbatim in your prompt and specify "copy this text exactly". The model performs better when given explicit text rather than asked to generate it.
Reference Images: The Power Feature
Nano Banana Pro accepts up to 14 reference images. Use them for:
Brand consistency
Upload your logo, colour palette, and existing brand assets. Prompt: "Create a new hero image matching the brand style from the uploaded references."
Character consistency
Upload multiple angles of a character/mascot. Prompt: "Show this character in a new pose, maintaining exact appearance."
Style transfer
Upload an image whose style you want to replicate. Prompt: "Create a new scene in the exact visual style of the reference image."
Product placement
Upload your product photo. Prompt: "Place this product in a lifestyle setting - modern kitchen counter, morning light."
Aspect Ratios for Websites
Match your output to its intended placement:
| Use Case | Ratio | Why |
|---|---|---|
| Hero/header | 16:9 or 21:9 | Spans full viewport width |
| Blog thumbnail | 16:9 | Standard preview cards |
| og:image (social) | 1.91:1 | What shows in link previews |
| Instagram/social | 1:1 | Square format |
| Pinterest/Stories | 9:16 | Vertical scroll |
| Team photos | 1:1 or 4:3 | Grid layouts |
Common Issues and Fixes
Text is slightly wrong
Regenerate - the model is probabilistic. Or simplify the text and try again.
Image looks too "AI"
Add "photorealistic", "authentic", "natural lighting" to your prompt. Avoid "perfect" or "beautiful" which trigger the uncanny smoothness.
Colours don't match brand
Include hex codes: "Use brand colours #1a1a2e and #4ecca3" or upload a colour palette as a reference image.
Wrong composition
Be explicit about layout: "text on the left third, image on the right two-thirds" or "centred composition with equal margins".
Too slow
For iteration, switch to Gemini 2.5 Flash to experiment, then generate your final version with Nano Banana Pro.
Nano Banana Pro in ChilledSites
In ChilledSites, select Gemini 3 Pro Image from the model dropdown to use Nano Banana Pro.
The platform adds controls for Style, Composition, Lighting, and Mood that inject professional terminology into your prompts automatically - so you don't need to remember all the photography jargon.
Token cost: 4,500 tokens per image (the highest of the image models, but worth it for text-heavy graphics).
Summary
Nano Banana Pro is the go-to model when you need:
- Readable text in your images
- Maximum 4K resolution
- Complex multi-reference compositions
- Infographics, menus, posters, diagrams
For quick iteration or simpler graphics, use faster models. For final, text-heavy, high-quality outputs - Nano Banana Pro is unmatched.