Nano Banana prompts for ads

How do you write a Nano Banana prompt?

Describe the image in full sentences, in this order: subject, action, location, composition, style. That is the text-to-image formula in Google Cloud's Nano Banana prompting guide. With reference images, it changes to reference images, then the relationship between them, then the new scenario.

Google's Gemini API image generation docs add best practices that apply directly to ads:

Google's product photography template runs: product on a surface, the lighting setup and its purpose, the camera angle and the feature it shows, sharp focus on a key detail, then the aspect ratio.

How do you add text to a Nano Banana ad?

Put the exact words in quotation marks and describe the font. Google Cloud's guide gives both rules, and the Gemini API docs say text renders best when you settle the wording first and then ask for the image with it.

The docs point to Nano Banana Pro (Gemini 3 Pro Image) for professional asset production with text, and list Nano Banana 2.1 as the main model for generation and editing. Aspect ratio can be written at the end of the prompt, as Google's templates do, or set in the API.

The templates below are written for this page and have not been run through Nano Banana; no outputs are shown. Square-bracket items are placeholders. Each still can also become the first frame of a video clip: see Veo 3 prompts and the AI ad prompt builder.

Nano Banana prompt for a product shot ad

A product shot prompt follows Google's commercial template: product, surface, light and why, angle and why, focus point. See the AI product demo examples for the subjects ads tend to show.

An ad image for [brand type, e.g. a refillable deodorant brand].
A high-resolution, studio-lit product photograph of [product, colour, material]
standing on [surface] with [one prop related to the scent or use] beside it.
The lighting is a soft overhead key light with a white bounce card to keep
the label free of glare. The camera angle is a straight-on eye-level shot to
show the full front label. Ultra-realistic, sharp focus on the [cap / texture].
Plain [colour] background with empty space across the top third.
Aspect ratio 4:5.

Nano Banana prompt for a lifestyle ad

A lifestyle image puts the product in use in a real place. Attach the product photo as a reference so the label stays correct. See the AI product placement examples.

Using the attached image of [product] as the product reference, keep its
shape, colour and label exactly the same.
A [age range] couple cooking together in a small apartment kitchen on a
weekend morning. [Person A] stirs a pan while [person B] reaches for
[product] on the counter.
Medium shot from across the counter, eye level, 35mm lens look, shallow
depth of field with the product in sharp focus.
Natural window light, warm and relaxed, editorial photography style.
Aspect ratio 4:5.

Nano Banana prompt for a UGC-style still ad

A UGC-style still should look like a phone photo, not a studio shot, so say so in the style sentence. See the get-ready UGC examples.

A casual phone photo for a social ad.
A [age range] woman with [hair] in a [hoodie] takes a mirror selfie in a
bathroom, holding [product from the attached image] up next to her face.
She is mid-laugh, eyes on the phone screen.
Vertical framing, phone visible in the mirror, slightly off-centre.
Overhead bathroom light, a little flash glare on the mirror, real skin texture,
ordinary towels and bottles on the shelf behind her.
Aspect ratio 9:16.

Nano Banana prompt for a text-on-image ad

Write the headline into the prompt in quotation marks and describe the type. Keep it to one short line plus a button-style label.

Create a static social ad for [brand], a [category] brand for [audience].
On the left half, [product] lies at a slight angle on a [colour] background
with a soft drop shadow.
On the right half, the headline "[headline, max 6 words]" in a heavy,
black, condensed sans-serif font, left-aligned.
Below it, a rounded [colour] button shape with the words "[button text]"
in white.
Flat, clean graphic design style, high contrast, generous margins.
Aspect ratio 1:1.

Check every word in the output before use. Google's docs list text rendering as a strength, but spelling still needs a human check on each image.

Nano Banana prompt for a before-and-after layout

Use a before-and-after layout only for things that change in a way a brand can show: a tidy room, a clean shoe, a fixed scratch. Do not use it for body, skin, weight or health results.

A split-screen ad image divided down the middle by a thin white line.
Left side, labelled "Before" in small grey sans-serif text at the top:
a [white trainer] with [mud stains] on a wooden floor.
Right side, labelled "After" in the same font: the same trainer, same angle
and position, clean, next to [product].
Both sides use identical lighting, framing and background, so only the
[shoe surface] differs. Eye-level close-up, soft daylight.
Aspect ratio 4:5.

Check each platform's ad policy before running any before-and-after image, and see AI ad labels on Meta and TikTok for how to label an AI-made image.

How do you edit a Nano Banana image instead of starting again?

Ask for one change and say what stays. Google's editing template is to change only one named element and keep everything else exactly the same, preserving style, lighting and composition.

That makes it quick to cut variants of one static ad: a new headline, a new background colour, a new hand holding the product. For running one script across every format, read one script, every format. If your AI ads already perform on paid traffic, see how Anglr works for creators.