Blog / 9 min read · 2026-08-22

Nano Banana Prompt Generator Free Online: Build a Prompt in Seconds

Use our free online Nano Banana prompt generator to build photo-edit, figurine, portrait, product, and character prompts, then copy the ready-made templates below.

Nano Banana Prompt Generator Free Online: Build a Prompt in Seconds

Looking for a Nano Banana prompt generator that is free and online? This site has one: the free Nano Banana Prompt Generator runs in your browser, requires no sign-up, and assembles a complete, well-structured prompt for Google’s Nano Banana image model from tested phrase blocks. Pick a mode, choose the options you want, and copy the finished prompt straight into Gemini.

This page shows you how to get the most out of the generator, then gives you a set of copyable prompt templates for cases where you would rather write and fine-tune the wording by hand. Gemini or Nano Banana access is separate, and available image features or limits depend on your current Gemini service and account.

How to use the free Nano Banana prompt generator

Open the Nano Banana Prompt Generator and work through three steps:

1. Pick a mode. The generator has five: Photo Edit, 3D Figurine, Portrait Style, Product Shot, and Character Kit.
2. Describe your subject and choose the options. Each mode exposes the choices that matter for that image type—lighting, framing, material, scene, mood—so you dial in the look instead of guessing at vocabulary.
3. Copy the result into Gemini. Upload your source image first when you are editing one, then paste the generated prompt.

Here is what each mode is for:

• Photo Edit builds an editing prompt around a guard block: an explicit list of everything Nano Banana must not change, such as the face, pose, clothing, composition, and background objects. Unrequested changes are the model’s biggest failure mode in photo editing, and stating what must stay untouched dramatically improves edit fidelity.
• 3D Figurine produces the viral collectible-figurine look by exposing the vocabulary that drives it: figure scale (commonly 1/7), material finish such as glossy PVC or matte resin, the display base, and the lighting.
• Portrait Style combines a portrait style and framing while instructing the model to preserve the person’s facial features, identity, and natural skin texture—no beautifying or restructuring.
• Product Shot sets the scene, camera angle, and mood while keeping the product’s shape, label text, and colors accurate.
• Character Kit solves character consistency across multiple images. It turns your character’s locked attributes into three reusable templates: a three-view character sheet, an identity-lock block you paste at the start of every later prompt, and a delta-edit template that changes only one thing at a time.

If the generated prompt is close but not exact, paste it into a text editor and adjust one line. That is usually faster than rebuilding the prompt from scratch—and it is exactly where the templates below help.

Generator or template: which should you use?

Use the generator when you want a complete, structured prompt quickly, or when you are not sure which details a good Nano Banana prompt should pin down. Use a template when your request does not fit one of the five modes, or when you want full control over every line.

The rest of this page is the template library. To use a template, open Gemini in an account where image creation or editing is available, upload a source image when you want to edit one, then paste a completed prompt. Replace bracketed text with your details before sending it.

Start with this prompt template

Use this as a reusable prompt builder. Keep only the lines that matter for your image; a shorter, focused request often works better than a crowded one.

[Create a new image / Edit this uploaded image] for [purpose].

Main subject: [specific person, product, or object].
Setting: [location, background, or scene].
Composition and lighting: [crop, camera angle, lighting].
Visual direction: [natural, studio, editorial, minimal, etc.].

Keep unchanged: [identity, logo, pose, label text, colors, crop, or other fixed details].
Avoid: [unwanted changes, props, text, distortions, or effects].

For an edit, begin with the exact change: “Replace the background,” “Change the jacket,” or “Remove reflections.” Then state what must remain untouched. For a new image, remove the preservation line and describe the subject more fully.

Portrait prompt templates

Portrait prompts need enough direction to establish the scene without accidentally redesigning the person. When working from an uploaded photo, explicitly protect identity, facial features, and skin tone.

Professional headshot

Edit this photo into a polished professional headshot for a [job title or industry].

Keep the person's identity, facial features, expression, hairstyle, and skin tone unchanged.
Use a clean [light gray / warm beige / office] background with soft window-style lighting.
Use a chest-up composition. Change the clothing to [outfit description].
Keep realistic skin texture and a natural appearance. Avoid heavy retouching, text, and watermarks.

For more workplace-specific variations, use these Nano Banana prompts for LinkedIn profile pictures.

Relaxed outdoor portrait

Create a realistic portrait of [person description] in [location].

The subject wears [outfit] and stands in a relaxed pose, looking [at the camera / slightly away].
Use soft late-afternoon light and a shallow depth-of-field look.
Frame the image as a [close-up / half-body / full-body] portrait.
Keep hands believable, facial proportions natural, and background details subtle.
Avoid artificial-looking eyes, extreme skin smoothing, text, and watermarks.

Editorial fashion portrait

Create an editorial fashion portrait of [subject] in [location or studio setting].

Feature [outfit, fabric, accessory, and color palette].
Use [hard side light / soft studio light / dramatic backlight].
The image is a [close-up / half-body / full-body] composition with a [confident / quiet / cinematic] mood.
Keep the face and body proportions realistic, with clean separation from the background.

If photorealism is your main goal, these Nano Banana prompts for realistic photos provide additional directions to adapt.

Product image prompt templates

For products, name the item and the commercial job: listing image, campaign visual, social post, or lifestyle scene. If a logo or label must remain accurate, say so plainly, but inspect the final image before publishing.

Clean ecommerce listing image

Edit this product image for a clean ecommerce listing.

Keep the product shape, logo, label text, colors, proportions, and materials unchanged.
Place it centered on a seamless [white / pale gray / light cream] background.
Use soft, even studio lighting and a subtle grounded shadow.
Remove dust, distracting reflections, and background clutter.
Do not add props, badges, extra products, or new text.

Lifestyle product scene

Create a premium lifestyle image featuring [product].

Place it on [surface] in [setting].
Include [one or two relevant props], arranged so they do not block the product.
Use [morning window light / warm evening light / soft studio lighting] from a [front-facing / three-quarter] angle.
Keep packaging, product color, logo placement, and proportions consistent.
Leave clean negative space on the [left / right / top] for optional copy.

Product in use

Create a realistic image of [person or audience] using [product] in [location].

Show the product clearly while it is used for [specific task].
Use [lighting] and a candid lifestyle-photography look.
Keep the product design, color, scale, and branding consistent.
Focus on practical hand placement and a believable setting.
Avoid duplicated products, distorted fingers, and unreadable labels.

For more commercial setups, see the Nano Banana product photography prompt templates.

Photo-editing prompt templates

Make one major change per request when possible. A background replacement, wardrobe change, and lighting overhaul can be split into separate edits so you can judge each result before moving on.

Replace a background

Edit this photo by replacing the existing background with [new background].

Keep the person or product unchanged, including identity, pose, clothing, edges, colors, and proportions.
Match the new background lighting to the subject.
Preserve realistic shadows and clean hair or object edges.
Keep the existing crop unless a crop change is necessary for the new background.

Change an outfit

Edit this portrait by changing the person's outfit to [specific outfit].

Keep the person's identity, face, body shape, pose, hairstyle, expression, and skin tone unchanged.
Make the clothing fit naturally with realistic fabric texture, seams, folds, and lighting.
Keep the setting and composition unchanged.
Do not change accessories unless they are part of the requested outfit.

Restore and clean a photo

Restore this photo while preserving its original character.

Remove [scratches / stains / noise / blur] and correct uneven exposure carefully.
Keep facial features, colors, clothing, background objects, and composition unchanged.
Do not add details that are not visible in the source image.
Keep the result realistic, without excessive sharpening or smoothing.

Prepare a polished social image

Edit this image into a polished social media photo.

Keep the main subject, identity, product details, and overall pose unchanged.
Improve lighting, crop, and background cleanliness for a [minimal / warm / colorful / editorial] look.
Use balanced contrast and natural color.
Leave clear space around the subject. Do not add text, logos, or decorative graphics.

For focused before-and-after workflows, read these Gemini photo-editing prompt examples.

How to rewrite a template quickly

A template becomes useful when its placeholders become concrete. Work through these choices in order:

1. Replace a broad subject with a visible description. Instead of “a woman,” write “a ceramic artist in a charcoal apron holding a glazed bowl.”
2. State the image job. A speaker profile image needs different framing from a product launch banner.
3. Choose one strong visual instruction, such as soft window light, a modern office, or a close crop.
4. Add preservation rules only for details that truly matter.

Here is a vague request:

Make this photo look better.

Here is a usable rewrite:

Edit this portrait for a professional speaker profile. Keep the person's identity, expression, hairstyle, and navy jacket unchanged. Replace the busy background with a softly blurred modern conference venue. Improve the lighting while keeping natural skin tones and the existing chest-up crop.

The second prompt states the goal, the allowed change, and the boundaries. That makes it easier to assess whether the result actually worked.

Common prompt fixes

If a face changes too much, repeat the instruction to preserve identity and facial features, then remove unrelated styling requests. If a product label becomes inaccurate, make fewer changes at once and treat the image as a draft until you have checked all printed details.

When an image feels synthetic, cut several adjectives and ask for realistic texture, natural lighting, and believable proportions. If the model changes more than requested, reduce the edit to a single operation, such as “replace the background only.”

FAQ

Is there a free Nano Banana prompt generator online?

Yes. This site’s Nano Banana Prompt Generator is free, runs in your browser, and requires no sign-up. It builds Photo Edit, 3D Figurine, Portrait Style, Product Shot, and Character Kit prompts from tested phrase blocks, with one-click copy.

Is using these prompts free?

The generator and the templates on this page are free to use, copy, and adapt. Access to Gemini image features, along with any availability or usage limits, depends on the current Gemini service and your account.

What should an image-editing prompt include?

State the requested change first, then list the details that must stay unchanged. For example, name the new background while preserving the subject’s identity, pose, clothing, and crop. The generator’s Photo Edit mode adds this preservation block automatically.

Why does a product image change the logo or label?

Small printed details can change during image generation or editing. Ask to preserve the logo and label text, use a clear source image, keep the edit focused, and review the result before using it commercially.

Conclusion

Start with the free Nano Banana Prompt Generator when you want a complete, structured prompt in seconds, and fall back to the templates on this page when you want to control every line yourself. Either way, replace the placeholders with specific details and protect only the details you need to retain. Small, deliberate revisions are usually more reliable than asking for a complete transformation in one prompt.