AI Image Generator with Nano Banana Pro: How to Write Prompts That Work
The ImgVX AI Image Generator turns a written description into a 2K picture with Nano Banana Pro (Gemini 3 Pro Image), Google’s most capable image model, on Google Vertex AI. The quality of the result depends mostly on the description. This guide gives a prompt formula that works, examples for common uses, and what the generator will not draw.
AI Image Generator: the short answer
- Formula: subject + setting + light + mood + style.
- Pick a style (Photo, Illustration, 3D render, Painting) and a shape (Square, 16:9, 9:16, 4:3, 3:4).
- One image is 2K and uses 20 credits; failed runs are refunded.
- It does not draw real people, public figures, nudity or logos.
What people search for, answered
How do I generate an image from text?
Open the AI Image Generator, describe the picture in a sentence or two, pick a style and a shape and press Generate. A run takes about 10 to 30 seconds and you download a 2K PNG.
What is Nano Banana Pro?
Nano Banana is the popular name for Google’s Gemini image models. Nano Banana Pro is Gemini 3 Pro Image, Google’s most capable image model at the time of writing, known for accurate text inside images and following detailed instructions.
How do I write a good AI image prompt?
Name the subject, where it is, the light and the mood, and the style: “a ceramic coffee mug on a sunny windowsill, soft morning light, shallow depth of field, photo” works far better than “a mug”. Add what matters most first, and say what text should appear in quotes if you need words in the picture.
Can AI image generators put text in images?
Nano Banana Pro is much better at text than older models. Put the words in quotes, keep them short, and check the spelling before you use the image.
Can I use AI generated images commercially?
Generally yes, within Google’s and our terms. Do not use them to deceive people, and make sure the image does not copy someone else’s trademark, character or artwork.
Why use ImgVX Pro AI for it
- Nano Banana Pro on Google Vertex AI, with Nano Banana 2 as a fallback if Pro is busy.
- 2K output in five shapes, from square posts to 16:9 slides and 9:16 stories.
- No subscription required: a credit pack is enough, and failed runs are refunded.
- Failed runs cost nothing. If Google returns an error or a safety filter stops the image, the credits go straight back to your account.
- No app, no watermark. It runs from the page in any modern browser on a phone or computer, and the download carries no ImgVX watermark. Google adds its invisible SynthID mark to AI images, which is how AI content should be labelled.
How to use the AI Image Generator, step by step
- Open the AI Image Generator.
- Describe the image: subject, setting, light, mood.
- Pick a style and a shape.
- Press Generate (20 credits) and download the PNG.
Tips for better results
- Product shot: “a glass bottle of olive oil on a rustic wooden table, olives and a sprig of rosemary, warm side light, photo”.
- Blog header: “a minimalist home office with a plant and a laptop, morning light, pale colours, wide shot”, shape 16:9.
- Illustration: “a friendly fox reading a book under a tree, children’s book illustration, soft watercolour”.
- Change one thing at a time between runs, so you learn what each word does.
What it will not do
- It does not draw real, identifiable people or public figures.
- No nudity, sexual content, gore, logos or trademarks; requests are refused before credits are used.
- Every typed description is checked by our payment provider’s moderation service before Google sees it, and Google’s own safety filters run on every image. Anything in our Acceptable Use Policy (sexual content, anything involving minors, deepfakes, fake documents, removing watermarks) is refused before any credits are used.
What it costs
Pro AI runs on paid credits only, because every run costs us money on Google Cloud: the AI Image Generator uses 20 credits a run. Pro Monthly is $5.90 a month with 300 credits (your first month is $1), enough for about 15 runs. Pro Yearly is $39.99 a year with 4,000 credits. With no subscription, a credit pack of 50 is $4.99 and 200 is $12.99. The free trial credits do not cover Pro AI, and an account’s Pro AI use is capped by what it has paid, so the $1 first month covers only a few runs. See pricing.
Your photo is sent to Google Vertex AI for that run and is not stored by us; we keep a log of the run (tool, time, credits and any text you typed). The privacy policy has the details.
Frequently asked questions
Is the AI Image Generator free?
No. It runs Nano Banana Pro on Google Vertex AI and each 2K image uses 20 paid credits. Failed runs are refunded.
What resolution are the images?
2K on the long side, in the shape you pick. Use the Image Upscaler for print sizes.
Do the images have a watermark?
There is no visible watermark. Google adds an invisible SynthID mark to every AI image. More help: ImgVX AI help docs.
Can it make images of me or a celebrity?
No. It does not draw real, identifiable people. Browse: all free image tools.
Can I edit a photo I already have?
Yes, with the AI Photo Editor or Object Insert.
Try it on your own idea
Pro AI runs on Google Vertex AI and needs Pro or a credit pack.