🍌 Gemini 3.1 Flash Image

Nano Banana, without the API key.

Nano Banana is the nickname for Google's Gemini Flash Image model, the one behind most of the AI photo edits you have seen this year. MightyPhoto runs on it directly. Upload a photo, type what you want changed, and download the result in about ten seconds. No API key, no billing account, no code.

Try it free → Prompt library

1 free edit on signup · no credit card

The same portrait after Nano Banana recolored the hair bright red Original portrait before a Nano Banana edit
BEFORE AFTER
"change my hair to bright cherry red"

What Nano Banana actually is

Nano Banana started as an internal codename at Google for an image editing model. The name leaked, people liked it more than the official one, and it stuck. The model it refers to is Gemini Flash Image, and MightyPhoto runs the current version, Gemini 3.1 Flash Image.

The important distinction: it is an image editor, not an image generator. Most AI image tools take a description and invent a picture. Nano Banana takes a photo you already have plus an instruction, and changes only what you asked about. That is why it is the model people reach for when the subject is a real person and the face has to stay the same one.

You can use it directly through Google AI Studio or the Gemini API, which means a Google account, a billing account, and in the API's case some code. MightyPhoto is the same model with none of that in the way.

How to use Nano Banana

  1. Upload the photo you want to edit

    Nano Banana is an image editing model, not just an image generator. It works from a photo you give it, so start with a JPG, PNG, or WebP up to 10 MB.

  2. Write the edit as a plain sentence

    Say what should change and what should stay. "Change the background to a gray studio backdrop, keep her face and clothing exactly as they are" beats a list of keywords.

  3. Read the result and refine

    Nano Banana is strong at keeping a face consistent across edits, so you can stack changes one at a time instead of trying to get everything in a single prompt.

Nano Banana prompts that work

The single biggest improvement you can make to a Nano Banana prompt is naming what should not change. Copy any of these and edit the specifics.

Prompts that change one thing and leave the rest alone

The most useful pattern. Name the change, then name what must not change.

  • "change the background to a clean light gray studio backdrop, keep the subject and lighting exactly as they are"

  • "change my shirt to a navy button-down, do not change my face, hair, or the background"

  • "remove the person in the red jacket on the left and rebuild the wall behind them"

  • "make it look like golden hour, warm low sun from the left, keep everything else identical"

Prompts that restore and repair

List the damage explicitly. A generic "fix this photo" gets a generic result.

  • "restore this old photo: remove the scratches, repair the torn corner, fix the faded color, and sharpen the faces"

  • "colorize this black and white photo with realistic skin tones and period-accurate clothing colors"

  • "remove the yellow age tint and restore the original colors without oversaturating"

Prompts that restyle completely

Name a specific visual style. "Cartoon" is vague; "Studio Ghibli watercolor" is not.

  • "turn this into a Pixar-style 3D animated character, keep the pose and composition"

  • "redraw as a Studio Ghibli watercolor scene"

  • "make this an inked comic-book panel with halftone shading"

Prompts for professional photos

Name the background, the lighting, and the outfit as three separate things.

  • "professional studio headshot, clean gray background, soft three-point lighting, navy blazer"

  • "corporate headshot with a softly blurred modern office background and warm natural light"

  • "place this product on a clean marble surface with soft overhead light and a subtle contact shadow"

Common Nano Banana edits

Each of these has a walkthrough with its own prompt examples.

AI headshot generator →LinkedIn headshot →Photo restoration →Colorize black and white photos →Remove a person from a photo →Change the background →

Nano Banana questions

What is Nano Banana?
Nano Banana is the nickname for Google's Gemini Flash Image model, an AI model that edits an existing photo from a written instruction rather than generating a new image from scratch. The name started as an internal codename, stuck, and is now what most people call it. MightyPhoto runs on Gemini 3.1 Flash Image.
Is Nano Banana free?
Google offers a limited free tier through AI Studio, and the Gemini API charges per image beyond that. Both require a Google account, and the API also needs a billing account and code. MightyPhoto gives you one free edit at signup with no credit card, then charges credits, starting at $4.99 for 10.
How do I use Nano Banana without an API key?
That is what MightyPhoto is. Sign up, upload a photo, and type the edit. There is no API key, no billing setup, no SDK, and no code. You get the same model behind a normal web interface.
What is Nano Banana good at compared with other image models?
Character consistency. It holds a face recognizably steady across edits, which is why it works for headshots, outfit changes, and multi-step edits where most image models drift into a different person. It also follows natural-language instructions about what to leave alone, which matters more than raw image quality for editing work.
Can Nano Banana edit a photo of a real person?
Yes, and that is the main thing it is used for. On MightyPhoto you should only upload photos you have the right to edit. Uploads are screened and the Terms of Service cover what is and is not allowed.
Does MightyPhoto train on the photos I upload?
No. Your photos are used to produce your edit and nothing else. See the privacy policy for the full detail on retention and deletion.

Use Nano Banana right now

One free edit at signup. No API key, no billing account, no code.

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