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Nano Banana Aspect Ratio Restrictions: Easy Fixes That Work

hitpaw editor in chief By Daniel Walker
Last Updated: 2025-09-25 20:35:27

When generating images on Google's Gemini, people have been encountering a consistent issue: the Nano Banana model fails to consider the requested aspect ratio specified in users' prompts. Even if the instructions have been explained clearly, Nano Banana renders images that do not conform to the requested aspect ratio. This article addresses the ongoing issue of Nano Banana aspect ratio and provides helpful tips on achieving the desired dimensions.

Part 1. Why Does Nano Banana Image Aspect Ratio Have Restrictions?

One of the main reasons behind Nano Banana aspect ratio restrictions is its fundamental design, as the model prioritizes tasks such as restyling. The Gemini 2.5 Flash model defaults to a 1:1 (square) aspect ratio, rather than the landscape versions, such as the 16:9 format.

Some of the limits of the Gemini Nano Banana aspect ratio when generating images, as compared to other tools, are as follows:

Feature

Specification

Explanation & User Impact

Default Aspect Ratio

1:1 (Square)

If your prompt doesn't specify the aspect ratio, the model defaults to a square picture (1:1). This is the output generated most of the time.

Max Output Resolution

1024x1024 px

The dimension of 1024x1024 px is the largest size a square image can be. A total pixel budget limits the model's output, and thus, this is the maximum size that can be used for a 1:1 ratio.

Total Pixel Budget

~1,048,576 px

This is the final limit for all generated images. The model resizes any requested aspect ratio to fit within this total area, which may result in sizes that differ from what you specified.

Non-Square Ratio Behavior

Rescaled to fit the budget

The model would not generate an image of 1024x576px if you ask for a 16:9 ratio. Instead, it finds the largest dimensions for that ratio when (width x height) is less than or equal to 1,048,576px.

Part 2. How to Use 2.5 Flash Image to Adjust Image Aspect Ratios

Despite the issues, you can actually use Gemini's AI model to create pictures in your desired landscape style by adding specific keywords to your prompt. This method tricks the model into generating an image that is exactly in the format that you have specified.

  • Step 1.Add "Generate a picture" before your original prompt and add "Aspect ratio 16:9" in the end.

    generate picture prompt specify aspect ratio
  • Step 2.Make sure you are not specifically selecting the "Nano Banana" feature from its tools before generating the image. Click on the "Send" arrow to generate your image.

    donot select nano banana feature click generate
  • Step 3.Download your landscape-format result by clicking the arrow that appears in the upper-right corner of the generated image when you hover your cursor over it.

    download landscape generated result image

Part 3. How to Fix Nano Banana Image Size Issues

While Google's Gemini Nano Banana is free to use for fast AI-based image generation, the downsides, particularly in terms of working out aspect ratios, can inhibit professional-grade work. Countering the problems related to the Gemini Nano Banana aspect ratio when generating images, here are some workarounds people have found around it:

1. Adjust Size & Boost Quality with HitPaw FotorPea

One of the easiest ways to get perfect landscape-oriented images is to use HitPaw FotorPea. It expands your square image to your desired size and format using advanced AI, giving you an image just like you wanted. FotorPea is an all-in-one photo enhancer tool that uses a strong AI model to resize your images and enhance their quality in a few seconds.

With this photo enhancement package, you can get over Nano Banana's limitations and have more flexibility. The platform allows editing, upscaling, and, most crucially, applying the right aspect ratios to match your demands flawlessly.

Key Features

  • 1.Enhances the resolution of the photo, retaining details and clarity so that you can create larger, high-quality prints.
  • 2.Removes grain noise and sharpens blurry areas to transform your low-quality pictures into clear masterpieces.
  • 3.Offers professional-looking results through strong AI presets that instantly enhance your photos.
  • 4.Uses over 9 built-in AI models for enhancing images to perfection.
  • 5.Quickly removes or changes backgrounds and uses high-quality filters.

Guide to Adjust Size and Boost Quality with FotorPea

You can instantly resize and enhance your Gemini-generated images with FotorPea by following the simple steps below

Step 1. Select the AI Photo Editor Button

Select the "AI Photo Editor" button on the homepage of the tool and upload your square image generated from Nano Banana.

select ai photo editor button

Step 2. Adjust the Image Size in FotorPea

Select "Adjust" from the right-most panel and select your desired landscape format. Adjust your photo in the cropping frame to set what you want to keep in the final image. Now, select "Apply" to apply the changes

adjust image size by crop fotorpea

Step 3. Successful Export or Further Enhancement

Click the "Export" button in the upper-right corner to download your resized image. Or simply click Enhancer to upgrade your image quality in one click.

resized image fotorpea

Step 4. Export Final Enhanced Results

Once FotorPea processes and upscales the picture, click the "Export images" button present on the bottom-right.

enhance image quality and preview

2. Transparent Reference Template

Make a transparent blank image that is in the exact shape you require (like a wide rectangle) through a simple tool or a free website. Upload this blank 'template' onto Gemini and prompt it to 'create an image in this area' or 'use this template to create an image.' The prompt tricks the model into taking your uploaded image dimensions into consideration, which works far better than specifying the ratio through text.

transparent reference template prompt

3. Prompting Tricks

Be super specific and forceful in your prompts. Instead of merely stating, "16:9," give commands such as "It MUST be a landscape picture" or "The output MUST absolutely be in a 16:9 ratio." Sometimes this works, yet usually it does not. Still, as many users use this method to get their desired image size, it is worth a try.

forced prompting tricks landscape image

4. Cropping After Generation

Just let the model work as it wants by generating a square image. After downloading, simply crop it to the desired shape using any basic photo editing application on your mobile phone or PC. Although this way, you might cut some elements from the image, it is the only foolproof way of getting you the right results.

cropping to landscape after generation

Conclusion

To conclude, Google's Gemini gives a glimpse into the world of easily attainable AI image generation. However, its core faults, particularly with Nano Banana aspect ratio problems and pixel budget limits, make it unsuitable for creative tasks that need accuracy. These limitations always disrupt projects, especially where image size and dimensions are critical.

The ideal answer is to use HitPaw FotorPea after image generation. Its robust AI Photo Editor tool crops your images to ideal dimensions and enhances them to professional quality, turning a frustrating restriction into a seamless combination of human and AI collaboration.

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