How to Use Nano Banana 2.1: A Practical Image Generation Guide

Nano Banana 2.1 lets you generate a new image from a written prompt or edit an existing image with references and instructions. The practical workflow is simple: choose Text-to-Image or Image-to-Image, describe the result, review the available settings and credit cost, generate, then inspect the output before downloading it.

Open the Nano Banana 2.1 editor

The short answer

Use Text-to-Image when you are starting from an idea. Use Image-to-Image when you already have a product photo, portrait, composition, or visual reference that should guide the result. For an edit, say what should change and what must remain unchanged. Choose the output settings exposed by the selected model, check the displayed credit cost, and review faces, logos, lettering, and small details at full size.

Step 1: Choose the right starting point

Start with Text-to-Image when

• You need a new illustration, concept, campaign visual, or social image.
• You can describe the subject, setting, composition, lighting, and style in words.
• You want to explore several visual directions before committing to one.

Start with Image-to-Image when

• You already have a photo that needs a new background, color treatment, or setting.
• A person, product, package, pose, or layout should remain recognizable.
• You want a reference image to guide the style, palette, or composition.

If preserving an existing asset matters, Image-to-Image is usually the clearer starting point. A reference gives the model visual information that a written description may miss.

Step 2: Write a prompt the result can follow

A useful generation prompt normally includes five parts:

1. Subject: What is the main person, product, object, or scene?
2. Setting: Where is it, and what appears around it?
3. Composition: Is it a close-up, overhead shot, centered packshot, or wide scene?
4. Lighting and style: Soft studio light, bright daylight, editorial photography, flat illustration, or another direction.
5. Constraints: Required colors, text, aspect, and details that must appear.

Example:

A centered studio product photo of a green insulated bottle on pale stone, soft window light from the left, clean natural shadows, premium outdoor catalog style, room above the bottle for a headline, landscape composition.

For an edit, divide the instruction into the change and the preservation rule:

Replace the kitchen background with a warm sunlit studio. Keep the bottle shape, green color, label, cap, camera angle, and existing shadow direction unchanged.

That second sentence is often as important as the requested change.

Step 3: Add useful references

Use a clear reference that supports the task. A product reference should show the label and shape without heavy obstruction. A portrait reference should make the face easy to inspect. A style reference should clearly express the palette, lighting, or rendering approach you want to borrow.

The editor shows the reference limit for the selected model. More references are not automatically better. If two references give conflicting directions, the result can become harder to control. Start with the minimum set that explains the subject and the visual direction.

Step 4: Choose format and resolution

Available resolution and aspect-ratio options depend on the model selected in the editor. Choose them for the destination:

• Square formats work well for catalog tiles, avatars, and many social posts.
• Portrait formats suit stories, vertical ads, posters, and mobile-first layouts.
• Landscape formats suit banners, presentation covers, and wide editorial images.
• Use a smaller available resolution for exploration and a larger available resolution for a selected final direction.

Check the credit cost shown in the editor before submitting. The available balance appears after sign-in.

Step 5: Review before you download

Do not judge only from a small preview. Inspect the image at full size and check:

• faces, hands, and repeated objects;
• brand marks, package labels, prices, and spelling;
• the edge of the main subject against the background;
• reflections, shadows, and perspective;
• whether details requested in the prompt are actually present.

If a result misses the goal, change one important instruction at a time. A focused revision makes it easier to learn which wording improved the output.

Common problems and focused fixes

The result ignores part of the prompt

Remove competing instructions and put the main objective first. Turn a long list of ideas into one scene with a few explicit constraints.

The edit changes the product or person too much

Use a clearer reference and state the features to preserve. Name the exact product shape, label, face, clothing, pose, or camera angle that should remain.

Text is misspelled

Keep the copy short, place the exact words in quotation marks, and give the text enough space. Always check spelling and numbers before publishing.

The image is too small for the final placement

Choose a larger available generation resolution, or use the AI Image Upscaler to prepare a 2K, 4K, or 8K version. Upscaling estimates detail, so compare the larger version with the original.

You need a transparent subject

Use the AI Background Remover to create a transparent PNG. Inspect hair, fur, thin accessories, and transparent materials before placing the cutout on a new background.

Frequently asked questions

Do I need design experience?

No. The editor is prompt based, but visual judgment still matters. Start with a clear objective, use references when needed, and inspect the result before using it in a finished project.

Can I edit a photo I already have?

Yes. Choose Image-to-Image, upload the photo, describe the change, and list the important details to preserve.

Is Nano Banana 2.1 free?

Current free access depends on the tool and site configuration. Generation uses credits, and the editor displays the cost before you submit.

Can I use generated images commercially?

Paid plans include the commercial-use benefit described on the site. You must also have permission to use uploaded photos, logos, trademarks, and other protected material. Review the Terms of Service before publishing.

Start creating

Open the Nano Banana 2.1 editor, choose a workflow, and begin with one clear image objective. If you are preparing product visuals, continue with the product photography workflow.