Free, Unlimited Nano Banana (Gemini 3 Pro and 2.5 Flash Image) API

Nariman Jelveh

Updated: December 16, 2025

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The Nano Banana model series is Google's image generation model that creates high-quality images from text descriptions. This tutorial will show you how to use Puter.js to access Nano Banana models (Gemini 3 Pro and 2.5 Flash Image) for image generation, without needing a Google API key. Using Puter.js, you can access Nano Banana directly from your frontend code without any server-side setup.

Puter is the pioneer of the User-Pays model, where users of your application cover their own usage costs. This means you as a developer don't pay anything for your users' image generation usage, making your app practically free to run. This model enables developers to offer advanced image generation capabilities to their application and scale to unlimited users at no cost to themselves.

Getting Started

To start using Puter.js, include the following script tag in your HTML file, either in the <head> or <body> section:

<script src="https://js.puter.com/v2/"></script>

Nothing else is required to start using Puter.js for free access to Nano Banana image generation capabilities.

Example 1: Image generation with Nano Banana Pro (Gemini 3 Pro Image)

Nano Banana Pro excels at generating sharp, legible text, allowing you to create posters or product mockups. It also comes with real-world knowledge and deep reasoning capabilities, ensuring your image information is accurate and precise.

puter.ai.txt2img("A vintage movie poster for 'The Last Voyage', featuring bold art deco typography with the tagline 'An Adventure Beyond Time' and 'Coming Soon 2024' at the bottom", { 
    model: "gemini-3-pro-image-preview"
})
.then(imageElement => {
    document.body.appendChild(imageElement);
});

Full code example:

<html>
<body>
    <h1>Nano Banana Pro Image Generation</h1>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.txt2img("A vintage movie poster for 'The Last Voyage', featuring bold art deco typography with the tagline 'An Adventure Beyond Time' and 'Coming Soon 2024' at the bottom", { 
            model: "gemini-3-pro-image-preview"
        })
        .then(imageElement => {
            document.body.appendChild(imageElement);
        });
    </script>
</body>
</html>

Example 2: Efficient image generation with Nano Banana (Gemini 2.5 Flash Image)

The Nano Banana (Gemini 2.5 Flash Image) is the state-of-the-art, low-latency image generation model, enabling you to quickly experiment and iterate with your results.

<html>
<body>
    <h1>Nano Banana Image Generation</h1>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.txt2img("A serene Japanese garden with cherry blossoms", { 
            model: "gemini-2.5-flash-image-preview"
        })
        .then(imageElement => {
            document.body.appendChild(imageElement);
        });
    </script>
</body>
</html>

Example 3: Comparing Nano Banana models

You can compare different Nano Banana models to compare the results.

<html>
<body>
    <h2>Model Comparison</h2>
    <div id="images"></div>
    
    <script src="https://js.puter.com/v2/"></script>
    <script>
        const prompt = "A cyberpunk street scene with neon lights";
        const container = document.getElementById('images');

        // Nano Banana (Gemini 3 Pro Image)
        puter.ai.txt2img(prompt, { model: "gemini-3-pro-image-preview"})
            .then(img => {
                const div = document.createElement('div');
                div.innerHTML = '<h3>Nano Banana (Gemini 3 Pro Image)</h3>';
                div.appendChild(img);
                container.appendChild(div);
            });
        
        // Nano Banana (Gemini 2.5 Flash Image)
        puter.ai.txt2img(prompt, { model: "gemini-2.5-flash-image-preview" })
            .then(img => {
                const div = document.createElement('div');
                div.innerHTML = '<h3>Nano Banana (Gemini 2.5 Flash Image)</h3>';
                div.appendChild(img);
                container.appendChild(div);
            });
    </script>
</body>
</html>

Example 4: Text and Image-to-Image generation

The following example shows how to generate an image from a text prompt and an image by providing input_image and input_image_mime_type parameters:

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.txt2img("Turn this image into a watercolor painting", { 
            model: "gemini-2.5-flash-image-preview",
            input_image: "iVBORw0KGgoAAAANSUhEUgAAAFsAAABbCAYAAAAcNvmZAAABWGlDQ1BJQ0MgUHJvZmlsZQAAKJF1kL1LA0EQxV/0JPiFESwtrjQSJcZolyImEkSLEBVNusvmvAiXuFxO1P/AQls7ITaCoNgI14qF2AsqVhYiWlkI12hYZxP1EsWB2fnxeDM7DNCmaJybCoBS2bYyqSl1OZtT/S/oRB8C9A5rrMLj6fQcWfBdW8O9gU/W6xE56+n0Yrc3tn+yfRByq8nH3F9/S3QV9Aqj+kEZYtyyAd8QcXrD5pI3iQcsWop4R7LR4KrkfIPP6p6FTIL4ijjAilqB+E7OzDfpRhOXzHX2tYPcvkcvL85LnXIQ05hFBFGMIQsVqX+80bo3gTVwbMHCKgwUYVNHnBQOEzrxDMpgGEWIOIIw5YS88e/beZpxBEw+EBx7mp4EnFf6WvO04DPQHwYuVa5Z2s9Ffa5SWRmPNLjbATr2hHhbAvxBoHYrxLsjRO0QaL8Hzt1PBAlkAaSoB8oAAABWZVhJZk1NACoAAAAIAAGHaQAEAAAAAQAAABoAAAAAAAOShgAHAAAAEgAAAESgAgAEAAAAAQAAAFugAwAEAAAAAQAAAFsAAAAAQVNDSUkAAABTY3JlZW5zaG904ZG7uwAAAdRpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IlhNUCBDb3JlIDYuMC4wIj4KICAgPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4KICAgICAgPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIKICAgICAgICAgICAgeG1sbnM6ZXhpZj0iaHR0cDovL25zLmFkb2JlLmNvbS9leGlmLzEuMC8iPgogICAgICAgICA8ZXhpZjpQaXhlbFlEaW1lbnNpb24+OTE8L2V4aWY6UGl4ZWxZRGltZW5zaW9uPgogICAgICAgICA8ZXhpZjpQaXhlbFhEaW1lbnNpb24+OTE8L2V4aWY6UGl4ZWxYRGltZW5zaW9uPgogICAgICAgICA8ZXhpZjpVc2VyQ29tbWVudD5TY3JlZW5zaG90PC9leGlmOlVzZXJDb21tZW50PgogICAgICA8L3JkZjpEZXNjcmlwdGlvbj4KICAgPC9yZGY6UkRGPgo8L3g6eG1wbWV0YT4K4RUGBAAAG9hJREFUeAHtXHt8VdWV/s65r4TwSAgQAiG85A2C2kIpFigoCFWoL1oftba1M/VFZ2gtU7XKtGXq0PZXR6rT4ovWKdWqg8hItYDCIA95KE8Bi7wSCBDCK+QmN/fec+b79r0nXtNUwNxk8sdd+Z2c195r7/3ttdZee+19roWCDS4y1CwI2M1SSqYQg0AG7GYUhAzYGbCbEYFmLCoj2RmwmxGBZiwqI9kZsJsRgWYsKiPZGbCbEYFmLCoj2RmwmxGBZiwqI9kZsJsRgWYsKiPZGbCbEYFmLKqFSHbK+oUuXZ/+AZbDc5wHzyZJTeK56088Qyxxb14qrRIl0ytP3XUynfi6arKXzkvLR81AqnULoSgxCLEuAoKgugEeFq8JjivgdOTyqGUnJEGH3usQ8b1Jz3wmrZ4pL99b5G2Rr87mnTpT/EQe+B6fxNOm+N9ywJbEWZFEG41kn+Y9gRWYVjaPLOJTxbM6IwmiUkv6jaQrv9IrDQ+R24rXulAnsqmmM3htNEZNF6/moxYCtsAjoPZh4hLHZQPiuKR/G3Tr1BEnzxzHzr+exNYdZ1B2Mp/IEEDkMT2l00cJd6p5fRadioBLBkZR3D4P+fkd4Q+GUH60EqWHSvHudot5WzM9gZbGOEECrqarJ5oP8DSB/UkV9tQzNY137TWW922P4we3FuC+ewaiXR4Bocr7CEZcZtX2oyZci1f/vBs/+flu7D5IG2y7aJMXxR3TCnD7zRejb3EubF8cPkqtZbPzZCXsOFx3JGojNt7/sAxPzd+FPy0pxwkBj7Y8ZHKS4wOvPgLeq7N5mLZ/VuNX19kw0zKhokomKyqz4PKZzcZIbZ0yvjuBboUhFBT44RDf8uNVKDlShW4dg1j1ylfQuTuTxHMQ8FNiY35mpyz4Y3As8rRiBpZTZx3c98BS5OXlYtb9Y9AqxHfsEVcMVQ+W5dhKbwtrWD6W76hOem6j8kQN7v/XVfjNS8f4qDefy0RpvKC0Q7Zd7UiTDJJTKqUBbDVSh4iNMvZWjdMt7W5OOb4ysROuvboYw4cVomPbIMFkMg564UgcFccpwcFadCwiyGxnkKBGnRhOhbOx/f2jKChsix5dchDiSwouS7Bw1qml1Q4gO2DTDPMhbXE85oNDwE9X2/hwz3FU10TQv29XtG8XZ38zl02JZ6c5rF80EsPcX2/C/fP2AJXsYUs2XYBzXBDQrINKSjelAWxJgkiV0yFEONDlnsJjP7wIt107AK1DLmxKmqQrZsTNpZTadNwk9REC74MvpsEtgBVrj+HfH9uNZatP8r4DjzOUYhdfv6EjHrzvUuRmBRFXNoITICaReBCL3jyAFxcdwGurqlB9qpJ5OvJgeVYFkOXD5JEdMGVSe9w+rR98tO+wWtEDdPDWqqOYeMcajqkXMb0EJunJGK8l/dKdBrCNcUxWVkBXo2f34/iveWPw2f55lBMXEaJiU1398SjvYtR6Gz5KpayLRam0BAylckdJJQZPfBsIayCUm8bGS71lIqxj+P2jHXD91B4IZeUjznxnqyzM+ukazP09TZTLjrHoGrrKp05X5wrAM7yUGQNuvMrBY78ag7w2EaYIwE/eP/31G3h4zikm7ZfIZ9xKgd4iJZv1UktMw6oxaZyD558ai9ZZlTSFrVAr9aXt3rjxNBYvLcGmndU4Vk7XzHWRl9saQwZn4ctTu6JfvwJcP+1VvLOpG9tJkORzy782NjSCUZ89jOULr0WQWkBjgM17zmDcV9fj5DGla8d0TCvXzmAkbdMFVUCdZYV5rWdUhZxqvPmHwRh9SR7iwQBilS6uvuU5vLW+kOk6MQ0l3+XgacrlbRopPZKtRlISLxt2EisWTUBOVi3bzsGo1sY7G09i5sNb6X5pMlLAhnhACEhNTugZOGxgG9rLswRHEm0Aa8O0dOuoG2077sXOVdejc65jJPpoWRgjJ72B0mNF5j3/XQCRf6sSbFs+CQO75dCWR7BnfxXG3PAiyg5fmuycprHZ0rVGEkGjSrbKr8CfF01Cjo/2OpZDUEJ4Zn4JrrxhJd7dQenytU+CKEBlD3XkJM7yf2kSjFegyYsmIyDQAp1m4fapxchvV2MEPspn989ejdKjBNp4EExzIaQ81d3x7e++xYE4jhg1pVdxa1w3iVLtUgOM/y2w00+NB9sluG4VnpjdF205g4s7IdRwEPrlb7bhnx4+yBp353uCyoEsYXsFKqU7dcR35fcKYHaAiV3w0mgAzxzkbpvWgx5giN5GHBvWn8BzCymdNrXi06i6MVFRrHsnG4/P34qYes8J4JZrh1MgOKBCA6xsdvrpAsHWgJN68JaS2LX7CVw/qRh06lBtn8WLL57AzJ/tIyD0YY3NlPvAfPKXTX4VS2k2tl5Ta0qUJFmzO9lVM21n55A6FACDBtCkmJiIjZ/PWcJ0nXgvM+PVxeOr+/MgE3dpj/kvVxiX0LWrMWxQZ3TtxDpoYDUxGmlsKv/z4HuOJBcItrjJ5qoiSbJj+PpVXRAI0iULOojUZOGBRzYRG6KkmIWJVyi9APEONUJ8PNDVGR5f5eF74yqG0a+4FafefliBICrPxrB6h/KqI2TbyVfjhRkz+Mh4MDp/EqkOLJf12sZxJE5tclhWKOBDn14SDr2XtrLTTcxFLmlKez+J9TnefQqwPcDEmQ13zmDq1E7Eh5WKRbDghQ84cMk7IIDG9sr+CaBU8nh4Z76jKhuAFUSiuchvX0a/2MaP7+9P31iNt1HrRHHDxBC6dN7G+6PMxPyGhQDhcd42XM1mh8VD2PzeQdjUQIvgDujBDoQCYKy7N/M1M2HVv34b+OgC6VOArSxqYbIC/goMvrgL/FaQcYlsvLHsEN+xIfS3E2kkhUp/DtJkRx3Ghk65qgZb1k3CvP/4HMaObMuSAuTAWWaujXm/+jI2LL0Rt3xZQB9gHkm4XDXViyCdkzzQlNbPOEmYEy6ZrgAmjO6F4sKd7GxJNetj0f+2NJ6kx4ZfINgCLRU4B9OmFLGyPsSo+pEYB7D3vQFGNpmAGzvsNZCPGiTylARllePV54rwwjPD0THb4qBIkKPZiBAIl/EON55F4P0oaB/C03OvxLO/6o8OeR8wryYlaook/FykuiRNFmeKLjvJpSbV+qOYOmUw1v/lm7jmqv1MQwl3NVZIaKhZaaALBDspzXWAu+hAabPo7vn4Knw2gvIqSQUlQYexvWpYfRIfNYBpHbmAMgGl+N0v+mLiFzsxPpKNANU6Eo/hpONg0dL9+O2CHThWRVBoqtyoePowbdpgPPfrkRRQapNmieJ3TqJEJ6auLLs1DpywEI4lOtth5+a3aYX5/zkBYy6p4HvOPtnRCU8pVcjOWUiDCS4QbPEQUKJE4WLgJ7AK8kSNbWWjTWPUeI99/YqKh0BWwwWQg1tv5lR8Sm/4GWuOUkoPMDr3j99fjfzBb+Cmr+3AXTNKUdhvGaZ9Yyu27T9q+jHE6f/Y0T1xzXhO0+PqPJ7PSSybvrUxc6ze9OmHMXrscjz+2+30ieKIc8BvF2jNaf2XUNTlQKK5FkGva/c5C/i7CTw0/m6Cc72IM65snAJKoM2AfcK9E4AC1OuY+lzUYNlySo3NATF0GnMeGoFsTYio0mXHazDm6pX4/UtMd5YxD3Tl0Z28C7D4TeDSiRuweuNR0ymPPflXLF6ugY0damacvPxEko2nZmhKLtfRb2Pz3nb43sNV+NY96xheUOYoBvUO4Xt39WB9FBCTfW88NRrsLTup1qycAkrBrFYobiMVZyOMu6RzQyRJl+RLC4DRQ4IoYOgVdoiGII6fPfIODpbKj9YhYNh5itaxI4x5qumBm+/agpmPbMfMn5RQqruRF4NX7PhzkzRKzZbpoiY49JzMgO4wcmjjhRcOIu6nANFTmXzlQAoCTZRWkepMJy8/JTUSbAtr3i5nDFmlR5Hlt/D5YZoJqtFJ0M3AVR8EFmv8aoEIfH5kF+ZW8x3GsE9h3p8IIL2bhESpoeSlmLOZSjMDTdaRsjw89rg0qCN5aIBMSjefnJvUbPHUYM58TnL2iiz8ZM4OozFatCju2gF9i5jEaEz9Npy7lPopLhBsSaSXRdeUEoY2l7+9j2f6CTQl06b243NKg1ZA6oAWKKkkqVbllT+ER+ZuxdDRi/Hdf16GFxYfZPu78h3LMbZfoAh4pdeh8snPgO9pCMuS63hBJNPA8jWrNTNW8QrgYLn+B+lJhhgGttA5X25l/fpfUEF1iaVTjSNfHl5ZVIbrxveiza7F5eN6o3/RCuwq6cxKKqgkoBqqrMAhcJIqqy92f1hjjoTfzLwOpU6Ti+YgM8tV53LM4GDvysQwxqOlIX9IHSuPpPEkMWkkWVjweg1KKqppXn1o08bF009cz3XF7ay4JJgVr9OGZFHyBjQ4mkmMvAgCH5cmsGNkXmwBrU5qJlK5Rii4gpRXQ+9K5ToEPYCTpyQU6en0xoNN04HaXDzxzC7EuEDro2SM+EwBZs8cRTz3saIKMpna85wkaaweGYmRRLFDfJJ+ztY0GClKWD8PnzQNyYwkTQn3pUy5PMT+5tyBNrsq7GBviSS78TCp7mngQnWjBP/86SN46c97CZHF2SRwy7RBeHZOXxQW7mEx9CRkSiTpCvR42BubzleKsvFx4oUGOo24SpR6SEvEQ1VmeNXwUSam0eCoe29QTs2nqXedJyF+yk9pNRFD5eOtoVoMHhjGk49dYfwkl6HXTRtKcPq0vJX0UBrAVm1pEmoKcMt392Hb7jMI0V1zQ2FMu6kPNr91I+67k6YiuIUNO852U9JNLILSLBup1RotsDpU1bqFVoGqBkqFvUMPBCjzyQyZhWN1It9LQ4zd5W1d+mQ+M7PUqrk6S95HkreJl2uAVPklGDW4DEv/OAGt6VE5XB+NcUo8d94+vtP4obyNpzQsi0lyNMjJXDho2+EQ3n19Mrp10JS7llHKGLWwNU4yPLpu4yEseeOvOMKdSq7AJbn6o7S+sorSHClOgG6fxuSxcWQFZO9JRup1kQDcZfRv4SpqQw3dPr1sxcjj5VrJ4bYFmYSPEfeLOFl4ZS1ngVU9E2+yTuG6seJtIa9dK8y4cwR69qH3QY2xJShMP2/BLtwzcz+TdGCx0rxUDflYAed9kwawVWlKkVa3vX12WSfw43t6YMY9g+Anpn7aY9tJuGcW1drh/owk1qaisaiLPsOfRmn5YLKilPrKUb5jAnJzU4FTt0QplwHY0Rr0G/EaDpQJPBs9iiqxY+0oOps2JySpefiWGDkMkA34wnPYUzqc6cMoKq7C7rWXI8uYHgqDOtwOkLvL/ScuXl18CDdN38S6dEn2rwSj8Uag8RzMchaBhKa1kjyuNUYK8dAvjmLEhCV4hXY8ytlY1MfRna5c1EhJrZEiP6HzUf0tmg/NQBOdxhNnijaDWApu2bTzOvvkx3PwDbBjLXWWwZQmgBDxiVnFd5QmzmhhXPtSIswb48aqOFNoMw9NgSYxLCeLCxEBlctF6ZhA5vY216lBuNLCj2a/g5vu2c2qdCdvdrxml9KeNFDj/WzZQFGdq0Y7LMzd9tix28VXv70Rlw76ENdMLsLQYTkYNqQrVTfERTGH0T1KVJA2ki6jsiRWRmS/uSojwCjxAknm2U+fN4urKT6untBZYHnUKOO11PA+ghqOyj6aAG1z0CDqp13n7hTjqluK3xj3TqAxBQE+U8sdVeQfjjrY8l4Z1m88hacWHMHeA6yJlafaJEiRy5YDtlerlLPxo3WvafBArq5HeDDgpGC8u5PnswzNnsC+LXciRFtvM6Rqmek7+14DGidDPQa+zLxUX7PdwY8O7WtwZNvXjJcmzgkieMx3+EAOCov/m490r56oweRRwMt/vNnEFpOJk6cY9u6uQoeef0h0rracWfI4NIhyttiElAbJbqB2RusooWZCoxuCRhOQCOioA2wcp2diM+Lmo8QR3gTJHZM5saW6A3jIo9CY4MdxHDPpuG0vhSR18igIsFXMvLw1s844wtyWYDFxIjalFx4pLcF1OT7UTcNlLpTGq8nHCvEyNvrcBGBLMllZs0kxOYIbn9YzN2oUD9rlAE2FRS2IUZppLPhc4JKMZhBk2VmlNb4189fHQB6QMSXKp3QCjcR0jsyG7I9GYlN+4lVCW1QX8jbuJss1bqAGQWY0Gqa06Ycm/RxVYeFppEQAkow7JrAEiBqkh3SnOPK5vNeWYG5S4zO+V1qNfqbRAls8xDAJJK8MG5Oez4x06j3TeXnI00cfXh0YV3yDttlnyhXAYqCyZKJ40gNzrxcigd40lEQjnczVAtOKFKaSPBZlBimZCIJja0MPvQT6ZgLio1C0l9/j4Z1T2NVdeu/+No/3xk9fP0YpjZgC6MubDklN//eu6wpJ20UTgN1Q3SR5UuekbSTIBVlhqrrcPrp5dNc0zf+4ujfE5/yfuUnTYXFTfZRlZAc4qXE0AH6kIefPLT0pmwlsASkJkoRz1dq3F7Nm9KXrx+UCTnbicqSNgOlf+sjiNNvlrCqL0+9vfaUfy9hDjZJv/v9DaQBbUisQvYO2z6yaqEGyg/S7FQwykwqqcXYFlrwwBrff2p+GpRXNcy0OHArjcKWWwMRL5NnPxN3f3nvP659Nj5mHu/YBH5ScRJSb7O1YDPfe+Tncfy9nhH66nmZln3XRCowZHAmD/Ha1weyCSm+ne7VMwwDpAaMKqu8EmMKklejWpRxXj+uMzl0sbNhSgpWrD+GlZ6/BFy9vQ6OiBsZxojKGq69bxll0p2Sd9NwDXfw88p559w2dVRf681STssPtMXTcUmxfNgl9+AmJjzPXB34wEt17tMes2cswecJYFPeiz73rBJ5fegyR00WsvmI8Cm7J1KR/oExDbEQSLVBYQYVQFbmzD2DGHb3w4PcvRtscfu/Ctw6/eamqCqNtG2244cdF3N61f/9ZfOM76/D2FsaxjR0RHx2eZAk8XssE5ZejdvsETrO5DY1F9B75R3521yclLS/ryMsXxZABp/E/C0ehKCeHQlvLHbYBRLj/JCeHdVBZNDX7D5Xj0d9uwRO/owY6mj1qEFc90ktp4ChgNPhJ8mgPCfTSBZ/H7Af7IK+VvA3KMF+H2Bd5eQzMM1BkcXfThwR63FQC/Z6ATkxcEiCLjw4PcF6eN6lbCZgxBewRmq5tO3MxatxbWLW5wnxeEuSgnNvGhwAr5aNH5GPMpndhAX4560rMnE44zJa2NMDSQJ3TwFUsZI3U0LO4YnRHfGFUodmSBjbER2l3owxAUeL1wZKkSUGlBx94HSXHaKd9zOtwS0GdrUyai+Tpow74qPb0ztkVSiAJFulah1SfvSrtMjNWmgU7C6Vl7fAvs1YxIOUwSEX/nrn5KRViXGdkDBLRYA1CnFh97x/GY3DfCr5mhzUBNR5sM8BQCrUQ4MvFTV/qwmk4A0CBbOzaW4kJN7yGYNFCfOPu/zXYWPxmMcYpddeeVFWzckOAPraxPVklxURMB0ilJa3UEs4sXQ5kcQKkGLjZhiAevE8c6nCBzndSDA3K+poA7fj1b08uanDXFj/xO3OauwBuXYpQ91cxcuIynJFXyIlUbhs/7r3jYuaT3U4/JVvWCMZG22kGZFfpxhUWcBpOGQqwnfOfWYNlawmUvycWvFyL5W8eYbwizEUFG/37eQOiXDFJpMgglDxTAqnm5vM6txzfvCJEO6+Is82PmIDP9BGQB5nWk2rP7qfy0Ws1McIYNhcH2Mk29w++9toOLFzK+IjTGe9uDWElP+2Djwsd3Hk7lJ2S8FDEJ73UeLAFkFE7saLUaqMk7SI4Uclrx0ia4g/aoNiqAoOGEmCzu8hFdVj5vMboQqClEvMqRhKqxPPzL8bjj15OmCnTlHYfgXn2ySl46Ifkl/MBM8ls8GiQaFaoGZXV8un1PWYIbfOZ1neUefQujM5FnOwoDMu4diTCTvR+aKBBfp/+oYxt48gEjSi9irz5KrF6jYWrr+BHnYGzuPM7n0F22y149z1unLxtPAo7CNQgaqne6zdJotUxtNta4DW7nVKronDsGSx6cggmju7A/iQIDPpz8snteUF+XObiobvH46LiDbjt7hJmVGcLvPrEMgnk5s3cNkmX0uY4Mn7cMMybXYu31x/BhHEDcdnQfEq8ljIcrFh5nAxUp/RT410/mQ/ZRtlNDUxtjuHEpmv5eV6EsGaZfc/65NlHdfYxwF9LSV+z7RTG3biYQsUwqgmJSiplStQZHtXgjltDmPtvQznTVBlxnKoKMsC/AtO/9kUEuXkmzkEtFncwZvIr2LCtb6L8+tE62X2uacoOv7fiMgy5qC2/ZNPKDTuHZQfoCcVZL4sLGB/wE73PTlqIcHgI33n1SN9Z4tA4qpuAkI2k/Ewebv3OX3DkFG0g1T5IHINUX38tv7mhBO8/Uom77l3GuUdnZlBsm1rRILkYOzbX+C8u49JlFXFOUhZh5izGOS79Hd4/rEVjl15EEKNGiBdNlbHP9Zlx4JbEcy/23dP3cXuZa3z+gPJysLZj2XC4WlPJ67t/sA5hfraXiALW59P4+8aDXVcHiYLYBbFkeTsMGLsejz67HZv4WyFnogGs++Aw5vzmMPpftYZeSlc2KJ9pCYT8c2M764tSFH5/tVmLVBErVr2L0lKlL+KOhCK8v/EEB0r9cgNQ1J1gGg+iIatIATCrMVlYs8VFr8+9yc+n3+NHsBWo4vra1oMn8cundmL4hJVYsb49+ZBXXdhAJaePGqr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            input_image_mime_type: "image/png"
        }).then((image)=>{
            document.body.appendChild(image);
        });
    </script>
</body>
</html>

Other image generation models

Nano Banana is not the only image generation model supported by Puter.js. You can also use the following models with the puter.ai.txt2img() function:

gemini-3-pro-image-preview
gemini-2.5-flash-image-preview
gpt-image-1.5
gpt-image-1
gpt-image-1-mini
dall-e-3
dall-e-2

Conclusion

With Puter.js, you can gain access to Google's powerful Nano Banana image generation models. This allows you to create applications with cutting-edge AI-powered image generation capabilities without needing Google API keys or backend infrastructure. And thanks to the User-Pays model, your users cover their own AI image generation usage, not you as the developer, making your app practically free to run!

You can find all AI features supported by Puter.js in the documentation.

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