In this guide, we’re going to help you master prompting inside Nano Banana, the most popular AI image generation and editing tool now.
If you’ve ever tried working with AI, you know how frustrating it can be when it produces the opposite of what you want. But with the right prompts, that problem disappears. Here’s a complete guide to creating precise prompts for both image generation and image editing, including real-life examples, specific formulas, and practical tips from my experience.
By the way, if you’d like to use Nano Banana with Gemini and other top AI models at an extremely lower price, Global GPT offers an integrated all-in-one experience.
What is a Prompt?
A prompt is essentially how you communicate with AI to get the results you want. Think of it like having a conversation: the clearer your instructions, the better AI understands your intent. In Nano Banana, mastering prompts is the key to producing high-quality images that match your vision. Incorrect or vague prompts often lead to unexpected outcomes, which is why understanding the structure of prompts is critical.
What Is Nano Banana?
Nano Banana is the commonly used name for Google’s Gemini image generation and editing models. In Google’s current Gemini API image generation documentation, Nano Banana refers to multiple image models:
- Nano Banana: Gemini 2.5 Flash Image, designed for fast and efficient image generation and editing.
- Nano Banana Pro: Gemini 3 Pro Image, designed for professional asset production, complex instructions, and stronger text rendering.
- Nano Banana 2: Gemini 3.1 Flash Image, positioned as a faster, high-efficiency image model.
For prompt writing, this matters because the best prompt depends on the model and task. Simple edits usually need short, direct instructions. Professional product shots, poster text, infographics, and multi-image compositions often need more detailed prompts and a higher-capability model.
Nano Banana vs Nano Banana Pro vs Nano Banana 2
| Model | Official model context | Best for | Prompt style | Recommendation |
|---|---|---|---|---|
| Nano Banana | Gemini 2.5 Flash Image | Fast image generation, simple edits, high-volume drafts | Short, direct prompts with a clear subject and edit instruction | Start here for quick drafts, simple edits, and everyday image tasks. |
| Nano Banana Pro | Gemini 3 Pro Image | Professional assets, product visuals, complex layouts, text rendering | Detailed prompts with composition, typography, brand style, lighting, and constraints | Use when the image needs accurate text, polished commercial quality, or complex visual control. |
| Nano Banana 2 | Gemini 3.1 Flash Image | Fast drafts, creative variations, efficient image generation | Medium-detail prompts with clear visual hierarchy and reference details | Use for fast iteration, multiple variations, and efficient creative exploration. |
If you are not sure which one to use, start with Nano Banana for quick drafts. Use Nano Banana Pro when the image needs accurate text, a polished commercial look, or a complex multi-element composition.
Mastering Image Generation in Nano Banana
For creating images, Nano Banana uses a simple but highly effective formula:
Subject + Goal + Scene + Style + Composition + Lighting + ConstraintsReal-Life Example: Cozy Café Portrait
Prompt Breakdown:
- Subject: young woman with freckles
- Action: smiling thoughtfully, sitting on a bench
- Environment: cozy café
- Art Style: shot on Canon 5D
- Lighting: natural light
- Details: warm and inviting
Result: Nano Banana generates an image where the woman’s smile, seating position, café setting, lighting, and mood all match perfectly. According to Google Gemini AI, this formula is one of the best ways to ensure accurate AI output.
Practical Tip: Always include specific details for the subject, environment, and style—this prevents generic or unexpected outputs.
Step-by-Step Guide
- Open Google Gemini Flash 2.5 and select Nano Banana from the tools dropdown.
- Input a prompt using the formula above.
- Check the generated image and adjust details if necessary.
You can even create your own Prompt Sheet to reuse successful formulas for future projects.
Best Nano Banana Prompts for Image Generation
| Use case | Copy-ready prompt |
|---|---|
| Product photo | Create a realistic studio product photo of [product] on [surface]. Use [lighting], [camera angle], and a [brand style] look. Keep the background clean, avoid extra text, and make the product the main focus. |
| Portrait | Create a realistic portrait of [person description] in [setting]. Use [lighting], [lens style], [mood], and natural skin texture. Keep the expression authentic and avoid over-smoothing. |
| Social media post | Create a [platform] image about [topic]. Use bold composition, clear visual hierarchy, [color palette], and space for a short headline. Do not add unreadable text. |
| Interior design | Create a realistic [room type] with [style], [materials], [color palette], and [lighting]. Use a wide-angle composition and keep the layout practical. |
| Character concept | Create a character concept of [character] wearing [clothing/gear], standing in [environment]. Use [art style], strong silhouette, and consistent design details. |
| Infographic | Create a clean infographic explaining [topic]. Use simple icons, clear labels, high contrast, and a professional editorial layout. Keep text short and readable. |
Mastering Image Editing in Nano Banana
For image editing, use this formula:
Keep + Change + Area + Style + ConstraintsThese five action words are essential for controlling AI edits with precision.
Example 1: Replacing a Sky with Nano Banana
- Prompt: “Replace the sky in the image with a light blue sky and fluffy white clouds. Photo realistic.”
- Result: The sky is replaced accurately without affecting other parts of the image.
Example 2: Replacing Clothing Without Affecting the Face using Nano Banana
We’ll take the café girl we generated above as an example.
- Prompt: “Replace the woman’s white top with a black t-shirt.”
- Result: The woman’s face remains identical, while the clothing is replaced perfectly.
Example 3: Complex Scenario with Multiple People Using Nano Banana
- Prompt: “Replace the woman’s pink top specific color with the red dress.”
- Result: Nano Banana correctly identifies the target person, preserves her face, and accurately generates missing details like arms and skin.
Practical Experience: Being specific about the person, the element to change, and the replacement ensures high-quality results even in multi-person images.
Best Nano Banana Prompts for Image Editing
| Editing task | Copy-ready prompt |
|---|---|
| Replace background | Keep the subject unchanged. Replace only the background with [new background]. Match the lighting and perspective so the result looks natural. |
| Change clothing | Keep the face, hairstyle, body shape, pose, and expression unchanged. Change only the clothing to [new outfit]. Preserve realistic fabric texture and lighting. |
| Remove object | Remove [object] from the image. Reconstruct the background naturally and do not alter the main subject. |
| Improve lighting | Keep all objects and people unchanged. Improve the image with [lighting style], balanced contrast, and natural colors. Avoid changing identity or facial features. |
| Product variation | Keep the product shape and camera angle unchanged. Change the product color/material to [new color/material] and preserve realistic shadows and reflections. |
| Style transfer | Keep the composition and subject identity unchanged. Convert the image into [style], while preserving recognizable details and clean edges. |
Common Nano Banana Prompt Mistakes
| Mistake | Why it fails | Better prompt habit |
|---|---|---|
| Asking for too many changes at once | The model may ignore some details or change the subject | Split complex edits into 2-3 steps |
| Not saying what to preserve | The subject’s face, pose, or product shape may drift | Use “keep unchanged” constraints |
| Vague style words | “Cool” or “better” can produce random results | Use concrete style terms: studio lighting, 4:5 crop, white background |
| No composition guidance | The image may feel poorly framed | Specify camera angle, crop, subject position, and aspect ratio |
| Overloading text in the image | Text can become cluttered or unreadable | Keep text short and use Nano Banana Pro for text-heavy designs |
Tips for Nano Banana Success
- Be specific: Include clear descriptions of subjects, objects, and desired results.
- Use the five key action words for edits: add, change, make, remove, replace.
- Reuse formulas: Consistency in prompts leads to more predictable and professional outputs.
- Bonus: You can change clothes or objects on a person without altering their face—a common issue solved by following the editing formula.
FAQs About Nano Banana Prompts
How do I make Nano Banana keep the same face?
Tell Nano Banana exactly what to preserve: face shape, expression, hairstyle, skin tone, pose, and identity. Use phrases such as “keep the face unchanged” and “do not alter facial features.” Avoid combining face preservation with too many unrelated edits in one prompt.
Can Nano Banana edit an existing photo?
Yes. Nano Banana can edit existing images with natural language instructions. It can change backgrounds, adjust lighting, replace clothing, remove objects, and create style variations. For best results, describe the exact area to change and the elements that should remain unchanged.
Is Nano Banana better than Nano Banana Pro?
Nano Banana is better for fast drafts and simple edits. Nano Banana Pro is better for professional assets, complex compositions, stronger text rendering, and more controlled visual design. The better choice depends on the task.
Why does Nano Banana ignore part of my prompt?
Nano Banana may ignore details if the prompt is too long, vague, contradictory, or overloaded with too many changes. Break the task into steps, use clearer constraints, and tell the model what to preserve.
Can I use Nano Banana prompts for product photos?
Yes. Product-photo prompts should include the product, surface, camera angle, lighting, background, brand style, and constraints such as “no extra text” or “keep the product shape accurate.”
Does Nano Banana add a watermark?
Google’s Gemini API image generation documentation says generated images include a SynthID watermark. If you publish AI-generated images, also follow the platform’s disclosure and usage rules.
Conclusion
Mastering prompting in Nano Banana allows you to:
- Generate detailed, realistic images from scratch
- Edit photos precisely without unwanted changes
- Maintain character consistency and quality across multiple edits
- There are even more wild ways to use Nano Banana, such as AI face swapping, outfit changes, cosplay ，3D AI Figurine，and altering a character’s pose.
For advanced users, future tutorials could cover advanced prompting techniques or a ChatGPT vs Nano Banana image generation comparison.
