Gemini AI Photo Prompt Generator

Build copy-paste photo prompts for Google's Gemini image models — Nano Banana (Gemini 2.5 Flash Image), Imagen 4, and Imagen 3. Pick a model, a use case (funny self-portrait, product shot, concept art, photorealistic scene), a visual style, and an aspect ratio. Get a finished prompt you can paste straight into Gemini, Google AI Studio, or the Gemini API.

Choose AI Model

Describe your image conceptAI prompt generation is unavailable right now.

0/800

Target Gemini model

Photo use case

Aspect ratio

Style

Mood

Try an example:

Cmd/Ctrl + Enter to generate

Your description is sent to our AI provider. Avoid personal or sensitive information.

Why Use This Gemini AI Prompt Generator?

Model-optimized output

The generated prompts use the phrasing, structure, and syntax that Gemini AI responds to best — not generic AI instructions.

Instant results

Go from rough idea to a polished, copy-ready prompt in seconds. No prompt engineering expertise required.

Copy and use immediately

Copy the generated prompt directly into Gemini AI and start seeing better results right away.

Free with no sign-up

Use the tool entirely free. No account, no subscription, no credit card. Just generate and go.

How this Gemini AI Photo Prompt Generator works

The Gemini AI Prompt Generator turns a rough idea into a polished prompt optimized for Gemini AI. Here is exactly what happens when you click Generate Prompt:

Your idea (and any options you picked — target model, use case, style, aspect ratio, etc.) is sent to our server.
Our server forwards a single request to an AI provider with a prompt-engineering template tuned for Gemini AI.
The provider returns the optimized prompt, we validate it, and it appears in the result box. Nothing is saved to your account because there is no account — we do not log your input or the generated output beyond short-lived rate-limiting metadata.
You copy the generated prompt and paste it into gemini.google.com, Google AI Studio, or the Gemini API to actually create the image, video, or response.

What you get with this tool

Free with no sign-up — usable straight from the browser, no API key or account required.
Daily generation limit — to keep the tool free and prevent abuse, there is a small per-day cap (visible at the top of the input box).
Tailored to Gemini AI — phrasing, structure, and any model-specific parameters are matched to Gemini AI, not a generic "AI prompt".
No data stored — your prompts are not used to train models and are not retained on our side beyond the request itself.

What this tool does not do: it does not call Gemini AI for you. You still need a Gemini AI account (or API access) to run the generated prompt against the actual model.

How to use this Gemini AI Photo Prompt Generator

Describe your photo idea

Type the image you want to generate — a subject, an action, a mood. Anything from "funny photo of myself as an astronaut" to "white-background product shot of a leather wallet" works.

Pick your Gemini model

Choose the image model you plan to run the prompt against: Nano Banana (Gemini 2.5 Flash Image) for editing and character consistency, Imagen 4 for photorealistic detail, or Imagen 3. The generator phrases the prompt for that model.

Pick a photo use case + aspect ratio

Tell the generator what kind of photo you want — photorealistic, funny self-portrait, meme image, product shot, or concept art — and choose an aspect ratio (1:1, 16:9, 9:16, 4:5, or 3:2). The use case switches the prompt template; the aspect ratio is added to the output.

Generate and copy

Click Generate Prompt and you get a polished, copy-paste Gemini photo prompt. Paste it into Gemini, Google AI Studio, or the Gemini API to generate the actual image.

Example Usage

Target model = Nano Banana, Use case = Funny self-portrait, Aspect ratio = 16:9. The prompt is phrased as an edit instruction that anchors identity to the user's reference photo, then describes the scenario, lighting, lens, and aspect ratio — exactly what Nano Banana needs to deliver a believable photo edit.

Input

A funny photo of myself riding a giant rubber duck across a city skyline at sunset

Output

Using the uploaded reference photo of the person as the face and identity, generate a wide cinematic photo of that same person riding a giant inflatable yellow rubber duck across a modern city skyline at sunset. Keep the face, hair, and skin tone strictly consistent with the reference photo. The person is laughing, leaning slightly forward, arms outstretched in mock superhero pose. The rubber duck is glossy and reflective, floating low above tall glass skyscrapers in soft golden-hour light, with warm orange and pink clouds in the background. Faint motion blur on distant traffic far below. Photorealistic, shot on Sony A7 IV with a 35mm lens, shallow depth of field on the foreground, sharp focus on the person's face, slight cinematic film grain. Aspect ratio: 16:9. --ar 16:9

Frequently Asked Questions

What is Nano Banana?

"Nano Banana" is the popular nickname (and former internal codename) for Google's Gemini 2.5 Flash Image model. It is the model behind Gemini's image generation and editing — particularly strong at character consistency, applying edits to an uploaded photo, rendering legible text inside images, and using world knowledge in the scene. When people search for "banana prompt" or "best nano banana prompts" they mean prompts written for this model.

Which Gemini image models does this support?

You can target three image models: • Nano Banana — Gemini 2.5 Flash Image. Best for editing an uploaded photo, character consistency, and prompts that need readable text in the image. • Imagen 4 — Google's flagship photorealistic image model. Best for high-fidelity DSLR-style photos with detailed lighting and lens control. • Imagen 3 — the previous Imagen generation. Still strong for general image generation, slightly weaker at text rendering.

How do I write a good Gemini photo prompt?

A strong Gemini photo prompt names: (1) a single clear subject, (2) the action or pose, (3) the setting and time of day, (4) the lighting and mood, (5) the style or camera details, and (6) the aspect ratio. For Nano Banana, write a flowing narrative paragraph. For Imagen 4 / Imagen 3, use comma-separated descriptors. If you want text inside the image, wrap it in "double quotes" inside the prompt.

Can I generate funny AI photos of myself?

Yes — pick "Funny self-portrait" as the use case. The generated prompt is written as an edit instruction for Nano Banana: it tells the model to use your uploaded reference photo as the face, keep identity consistent (same hair, skin tone, features), and place "you" into the funny scenario you described. You will still need to upload your reference photo when running the prompt inside Gemini.

How do I use the prompt with Gemini or the Gemini API?

Paste it straight into the Gemini chat (gemini.google.com), into Google AI Studio, or into the Gemini API with model "gemini-2.5-flash-image-preview" (Nano Banana) or "imagen-4.0-generate-preview" (Imagen 4). For self-portrait or edit use cases, also upload your reference photo in the same chat / API request.

Is the tool free? Do I need a Google AI Studio key?

The prompt generator is completely free and does not require any sign-up. You do NOT need a Google AI Studio or Gemini API key to use the generator itself. You only need a Gemini account (free is fine) — or a Google AI Studio / Gemini API key — to run the generated prompt against the actual image model afterwards.

Related Tools

Try It

ChatGPT Prompt Generator

Generate optimized prompts for the latest OpenAI models — GPT-5, GPT-4.1, GPT-4o, o3, and o4-mini. Pick a model and choose plain text, JSON schema, function call, or system+user output. Free, no sign-up.

Try It

Midjourney Prompt Generator

Generate detailed Midjourney image prompts instantly. Describe your image concept and get a polished prompt with style modifiers, parameters, and quality boosters. Free, no sign-up.

Try It

Stable Diffusion Prompt Generator

Generate optimized Stable Diffusion prompts with negative prompts included. Describe your image idea and get a detailed, ready-to-use SD prompt. Free, no sign-up.

Try It

Veo 3 Prompt Generator

Generate optimized Google Veo 3 video prompts instantly. Describe your video concept and get a rich, cinematic prompt with camera movements, lighting, and scene details. Free, no sign-up.

Try It

AI Paragraph Generator

Generate well-structured paragraphs on any topic instantly. Enter a subject or prompt and get a polished paragraph ready to use in essays, articles, or content. Free, browser-based, no sign-up.

Try It

AI Story Generator

Generate original short stories instantly. Choose your genre, set characters, pick a theme, and get a unique story in seconds. Free, browser-based, no sign-up.

The Gemini AI Photo Prompt Generator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

Featured On