Lesson 3 · Gemini Mastery Free ~7 min read Updated June 30, 2026

Nano Banana Pro: Google's best image model, explained.

"Nano Banana Pro" is the nickname for Gemini 3 Pro Image — Google's most capable image generator and editor, now generally available. It's the first mainstream model that reliably puts readable text inside an image, edits photos from a sentence, and grounds what it draws in real-world facts. Here's what it does, what it costs, and how to try it for free.

01 What it actually is

Nano Banana Pro is the consumer nickname; the formal name is Gemini 3 Pro Image. It's built on Gemini 3 Pro, generates and edits images in roughly 2–5 seconds, and unlike a plain text-to-image tool it reasons about your request before drawing — which is why it handles layout, labels, and edits far better than older diffusion models.

02 What makes it different

Real text inside images

This is the headline. Accurate text — product labels, UI mockups, infographic callouts, signage, posters — has been the failure mode of image generators since the Stable Diffusion era. Nano Banana Pro renders legible, correctly spelled text, which makes it genuinely useful for marketing mockups, slides, and diagrams rather than just pretty pictures.

Edit from a sentence

Send an existing image plus an instruction in plain language — "make the jacket navy," "remove the person on the left," "add a price tag that says $19" — and it applies only that change while preserving everything you didn't mention. No regenerating the whole image and hoping.

Grounded in Search

Google grounds generation in Search data, so a prompt like "the Eiffel Tower at sunset" gets factual geometry and plausible lighting instead of an impressionist guess. Helpful when accuracy matters.

Every image ships with an invisible SynthID watermark baked into the pixels — no visible mark, no quality hit, but detectable by Google's tools and not optional. Plan around it if provenance or re-use rules matter for your work.

03 What it costs

Pricing is per image, by resolution (Google's official rates — always verify the current numbers):

Up to 1024²
$0.039 / image
1K–2K (common)
$0.134 / image
4K (4096²)
$0.24 / image

The Batch API halves every one of those prices if you can accept up to 24-hour processing — worth it for large, non-urgent jobs. For a sense of scale against subscriptions and other tools, run your volume through our AI cost calculator.

04 How to start (free first)

Frequently asked

Nano Banana Pro — your questions, answered

What is Nano Banana Pro?
It's the nickname for Gemini 3 Pro Image, Google's most advanced image generation and editing model, built on Gemini 3 Pro. It both creates new images and edits existing ones from plain-language instructions, usually in a few seconds.
Is it free?
You can try it free in Google AI Studio with a Google account (around 200 images/day to evaluate). Beyond that, generating via the Gemini API or Vertex is paid, priced per image.
How much does it cost?
By resolution: about $0.039 up to 1024², $0.134 for the 1K–2K tier, and $0.24 for 4K. The Batch API halves all of these for slower processing. Verify Google's current pricing before you rely on it.
What is it best at?
Rendering accurate text inside images (labels, mockups, infographics, signage), natural-language editing that preserves untouched areas, and Search-grounded accuracy. That makes it practical for real design and marketing work, not just art.
Does it watermark images?
Yes — every image carries an invisible SynthID watermark in the pixels. No visible mark or quality loss, but it's detectable and can't be disabled.
Can it edit existing images?
Yes. Send the original plus a plain-language instruction and it changes only what you asked for, keeping the rest intact — ideal for one-detail fixes without regenerating everything.