Where to Run Nano Banana Pro Prompts for Free: No API Key Needed

Published: July 18, 2026

Say you already have a Nano Banana Pro prompt ready — from our prompt guide or anywhere else. What you need next is a place to run it. This article covers what ilisai's AI image generator serves as of July 18, 2026, what each image costs in credits, and six starter prompts in case you want to generate something today.

The short version: ilisai runs Nano Banana Pro (Gemini 3 Pro Image) and its two smaller siblings in the browser. You sign in, paste a prompt, pick an aspect ratio and a quality, and generate. No API key to configure, no card to enter.

What you can run in ilisai

As of July 18, 2026, ilisai serves three Google image models: Nano Banana Pro (Gemini 3 Pro Image) at 1K, 2K and 4K, Nano Banana 2 (Gemini 3.1 Flash Image) at the same three qualities, and Nano Banana 2 Lite (Gemini 3.1 Flash Lite Image) at 1K. All three accept the same ten aspect ratios, from square 1:1 to ultrawide 21:9.

The 1K ceiling on Nano Banana 2 Lite comes from the model itself, not from ilisai. Available aspect ratios on all three models: 1:1, 3:4, 4:3, 16:9, 9:16, 21:9, 3:2, 2:3, 5:4 and 4:5.

How to run a prompt, without API keys

Create a free account, open the image generator, paste your prompt, choose model, aspect ratio and quality, and generate. Nothing in the flow asks you for an API key — generation runs through ilisai's own provider integration — and starting requires no card.

1. Create an account. Sign in with your Google or Microsoft account; it takes under a minute.
2. Open the image generator and paste your prompt.
3. Pick model, aspect ratio and quality. Draft cheap, then rerun the keeper at higher quality.
4. Attach reference images if you are editing. Up to four per run — that covers identity-preserving portraits, background swaps and product compositing.
5. Generate. The Images page produces up to four images per run. You can also ask for an image inside a regular ilisai chat, but the Images page is where the ratio, quality and model controls live.

Is it free? What each image costs

You can start without paying: the account is free and the Free plan includes 400 credits per calendar month (data as of July 18, 2026; 1 credit = €0.01). Generation is priced per image, by model and quality — from 8 credits for a Nano Banana 2 Lite draft to 80 credits for a 4K Nano Banana Pro render.

Per-image prices as of July 18, 2026:

The Free plan's 400 monthly credits translate to around 50 Nano Banana 2 Lite images a month, with included-credit spend capped at 40 credits per day. One detail worth knowing as of July 19, 2026: on the images page each run reserves up to 4 images, so included credits cover Nano Banana 2 Lite there, while Nano Banana 2 fits within included credits when you generate a single image in a chat. Nano Banana Pro is available on every plan and draws from your credit wallet, which you top up as you go. If you generate a lot, the Starter plan includes 1,500 credits per month and the Pro plan 4,000.

Six starter prompts

The prompts below cover six common jobs: a portrait, a product shot, a poster with text, a background edit, a vertical social visual and a sticker sheet. Paste one into the generator, apply the suggested settings, and swap the nouns for your own case.

Portrait with studio light

Settings: Nano Banana Pro · 4:5 · 2K

1Portrait of a woman in her 30s with short dark hair, soft studio key light from the left, neutral gray backdrop, 85mm look with shallow depth of field, natural skin texture, calm confident expression. Photorealistic.

Product shot on a colored background

Settings: Nano Banana Pro · 1:1 · 4K

1Studio photograph of a matte black wireless earbuds case standing on a glossy coral pedestal, seamless coral background, soft top light with a gentle reflection under the product, crisp edges, commercial e-commerce style.

Poster with legible text

Settings: Nano Banana Pro · 4:5 · 4K

1Concert poster for an indie band called 'Paper Rivers': hand-printed riso style, two-color palette of deep blue and warm cream, large title 'PAPER RIVERS' in bold condensed type at the top, date 'OCT 12' and venue 'La Riviera, Madrid' at the bottom, textured paper background.

Background swap on your own photo

Settings: Nano Banana Pro · keep the original ratio · 2K · attach your photo as reference

1Keep the person from the attached image exactly as they are — face, pose, clothing and lighting direction. Replace the background with a bright coworking space, softly out of focus. Match the color temperature of the new background to the subject.

Vertical visual for Stories

Settings: Nano Banana 2 · 9:16 · 2K

1Flat-lay of a homemade breakfast table shot from above: sourdough toast with avocado, a ceramic cup of coffee, a linen napkin, morning window light from the right, warm tones, empty space in the top third for overlay text.

Sticker sheet from a mascot

Settings: Nano Banana 2 Lite · 1:1 · 1K

1Sticker sheet of a cheerful orange cat mascot in six poses: waving, sleeping, celebrating, thinking, drinking coffee, giving a thumbs up. Bold outlines, flat colors, white die-cut border around each sticker, plain light background.

These six get you generating. The full library — more than 20 prompts organized by use case, each with its recommended ratio and quality — lives in our complete Nano Banana Pro prompt guide.

Frequently asked questions

Quick answers to what readers ask most before their first generation. Every product fact below reflects what ilisai serves as of July 18, 2026.

Is Nano Banana Pro the same as Gemini 3 Pro Image?

Yes. Nano Banana Pro is the name of Google's Gemini 3 Pro Image model. ilisai serves it under that name, on the stable gemini-3-pro-image model, alongside Nano Banana 2 (gemini-3.1-flash-image) and Nano Banana 2 Lite (gemini-3.1-flash-lite-image).

Do I need an API key or a credit card?

No. You sign in with a Google or Microsoft account and generation runs through ilisai's own provider integration — you never handle keys. The Free plan requires no card and includes 400 credits per month.

Which of the three models should I use?

Draft with Nano Banana 2 Lite (8 credits per image) or Nano Banana 2, then rerun the version you like on Nano Banana Pro — especially when the image contains text or you need 4K.

Can I edit an existing photo?

Yes. Attach up to four reference images to a run and describe the change. Identity-preserving edits, background swaps and style transfers all work this way; keep the original aspect ratio to avoid unexpected crops.

Do prompts have to be in English?

No. The models handle prompts in Spanish, French and other languages with similar results. What matters is being specific, whichever language you write in.