Nano Banana image prompt guide
Everything we have learnt about rolling out AI safely at work, from a free AI policy template to hands-on guides for Claude, ChatGPT and Copilot.
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Nano Banana Guide
Create AI image prompts with Gems
Image prompts that come out the way you pictured them
Use the arrows to browse four slides: set up Gemini, build a Gem that writes structured JSON image prompts, and move to Google Cloud when the images go into production.
Getting started with Nano Banana
Create an account and try AI image generation
Create a Google account
Go to accounts.google.com and create an account if you do not have one. Use your Google Workspace account at work.
Open Gemini
Go to gemini.google.com and sign in with your Google account.
Create a Gem
Click Gems in the left-hand column.
Other image generators
The JSON prompts you create work with several AI image generators:
Midjourney
Artistic quality
ChatGPT Images
OpenAI
Stable Diffusion
Open source
Nano Banana Pro
Google Gemini
Create your Gem
A dedicated image prompt generator
What a Gem is
A Gem is the Google version of a custom AI assistant, like a custom GPT in ChatGPT. You give it instructions for how to behave.
How to create the Gem:
Instructions
This prompt turns your Gem into a specialist in detailed JSON prompts for AI image generation.
The prompt covers:
Paste into "Instructions" when you create your Gem
Vertex AI on Google Cloud
The option for production work
EU AI Act: from 2 August 2026, Article 50 requires you to disclose deepfakes, meaning AI images, audio or video of real-looking people, places or events that you publish. Label realistic AI images of people as AI-generated before they go on your website or LinkedIn.
Why Vertex AI
Vertex AI, now part of the Gemini Enterprise Agent Platform on Google Cloud, runs the same Nano Banana image models under business terms and billing.
Nano Banana Pro (Gemini 3 Pro Image)
More settings and parameters
Google Cloud contract and billing. Images still carry an invisible SynthID watermark
Generate images from your own systems
Getting started with Vertex
Go to cloud.google.com
Search for "Vertex AI" in the console
Go to image generation
Use the prompt from your Gem
Tip: Learn in the Gemini app first, and move to Vertex once the images go into production.
Tip: Save every JSON prompt that worked as a template for the next image project.
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