Nano Banana 2: Google's Free AI Image Generator

Nano Banana is Google's AI image generation platform, built on top of Gemini. The current version — Nano Banana 2 — runs on Gemini 3.1 Flash Image and delivers 4K output, character consistency across prompts, and multi-image blending. And it has a free tier, which Midjourney does not.

Nano Banana 2 vs. Midjourney V8

Both are strong. They're built for different things:

| | Nano Banana 2 | Midjourney V8 | |---|---|---| | Price | Free tier available | Paid only | | Character consistency | Excellent | Good | | Output resolution | 4K | 2K (--hd) | | Artistic style control | Good | Excellent | | Text in images | Excellent | Good | | Multi-image blending | ✓ | ✗ |

Use Nano Banana when: You need consistent characters across multiple images, high-res product shots, or text rendered inside images (logos, signs, labels).

Use Midjourney when: You need maximum artistic quality, a specific aesthetic style, or fine-tuned compositional control.

How to Access Nano Banana 2

Three ways:

1. Gemini App — Go to gemini.google.com, switch to image generation mode, and start prompting. Free.
2. Gemini API — Access Nano Banana 2 via the Google AI Studio or the Gemini API. Free tier available; paid tier for higher volume. See: ai.google.dev/gemini-api/docs/image-generation
3. Firebase AI Logic — For apps: integrate via Firebase for production image generation. See: firebase.google.com/docs/ai-logic/generate-images-gemini

Writing Prompts for Nano Banana

Nano Banana responds well to natural, descriptive language. You don't need special syntax.

Effective prompt structure:

[subject] + [context] + [style/quality descriptors] + [technical specs]

Example:

a woman in her 30s working at a modern desk with a laptop,
casual professional attire, warm natural light from a window,
editorial photography style, shallow depth of field, 4K ultra-detailed

Prompting tips:

• Be explicit about quality: "4K", "ultra-detailed", "professional photography"
• Describe lighting directly: "soft window light", "golden hour", "studio strobe"
• For consistent characters across images: describe the same person in detail in each prompt
• For text in images: wrap text in quotes and be explicit — a street sign that reads "Hello World"

Multi-Image Blending

Nano Banana 2's standout feature: combine multiple input images into a single coherent output. Use cases:

• Blend a product photo with a lifestyle background
• Combine brand elements into a unified marketing asset
• Merge character references for consistent visual identity

In the Gemini app: attach multiple images to your prompt and describe how you want them combined.

Character Consistency

If you're generating a set of images featuring the same person (for a campaign, for example), describe the character with the same specific details in each prompt:

a woman with short auburn hair, green eyes, wearing a navy blazer,
[change the scene/activity per image]

Nano Banana 2 maintains these attributes across generations better than most models.

The Nano Banana Pro Model

For highest quality, Nano Banana Pro runs on Gemini 3 Pro Image (vs. Gemini 3.1 Flash Image for NB2). Pro produces more artistically refined outputs and handles complex compositions better. Available via the API.

Learning Resources

• Official Image Generation Docs — ai.google.dev/gemini-api/docs/image-generation
• Nano Banana 2 Overview — gemini.google/overview/image-generation/
• Prompting Tips for Nano Banana Pro — blog.google/products-and-platforms/products/gemini/prompting-tips-nano-banana-pro/
• r/GoogleGemini — Community outputs and prompting strategies
• Google AI Developer Community — discuss.ai.google.dev/