How to Change Aspect Ratio on Nano Banana for Google Gemini

If you’ve ever played around with Nano Banana on Google Gemini, you probably know the frustration: you can’t freely adjust the aspect ratio of your generated images. No matter how creative your prompt is, the result often comes out in the same default resolution. And if you try to transform a portrait photo into a landscape one, the outcome usually refuses to budge—it stays portrait.

I remember the first time I ran into this issue. I had a portrait photo that I wanted to turn into a nice wide landscape image, perfect for a banner. I thought, “This should be easy, right?” Well, it wasn’t. The photo stayed exactly the same, and the aspect ratio didn’t change at all. It felt like hitting a creative wall, especially when I had a specific vision in mind.

But here’s the good news: there’s actually a way around this limitation. And it doesn’t involve hacking the system or waiting for an update from Google. Instead, you can use a neat trick with a Hugging Face tool called Nano Banana Aspect Ratio Change. With this tool, you can set your preferred resolution, generate a transparent image, and then bring everything back to Google Gemini with the right prompt. It sounds a little tricky at first, but once you do it, you’ll realize it’s pretty simple.

In this guide, I’ll walk you step by step through the process. Think of it like a life hack for your AI-generated images. Whether you want your output in 16:9 for a YouTube thumbnail, 1:1 for an Instagram post, or even a custom size that fits a website header, you’ll finally have control.

So, let’s break it down together.

Step-by-Step Guide to Changing Aspect Ratio

Here’s the exact process you can follow to change the aspect ratio of your images on Nano Banana.

1. Visit the Hugging Face tool

First, head over to Nano Banana Aspect Ratio Change. This is a free and accessible tool that lets you control image resolution before you take it back to Google Gemini.

2. Pick your aspect ratio

Once you’re there, you’ll see options to choose a predefined aspect ratio. For example, you can pick 16:9, 9:16, 1:1, or others depending on what you need. If none of the presets match your vision, there’s a Custom Size option where you can set exact pixel dimensions. That’s super handy if you’re working on something specific, like a blog header or social media banner.

3. Generate the base file

After selecting the aspect ratio, just tap Generate. The tool will create two things for you: a transparent image in the chosen resolution and a ready-to-use prompt. Don’t worry if it looks plain at this stage—that’s exactly how it’s supposed to be.

4. Download the image and copy the prompt

Save the transparent image to your device, and don’t forget to copy the prompt text that comes with it. You’ll need both of these in the next step.

5. Switch over to Google Gemini

Open Google Gemini and head to the Nano Banana feature. This is where the magic happens.

6. Upload your images one by one

Here’s the important part: upload your original photo first, and then upload the transparent image you downloaded from Hugging Face. Make sure you do it one by one—not together—otherwise, the system might not process it correctly.

7. Paste the prompt and hit send

Paste the prompt text into Gemini’s input box and hit Send. This helps guide the AI to use the resolution you picked earlier.

8. Check the results

That’s it! Gemini will now generate your image in the new aspect ratio. You’ll notice that the resolution finally matches what you wanted, whether that’s landscape, portrait, or something totally custom.

When I first tried this process, I was skeptical. But the moment I saw my portrait photo transformed into a wide landscape format, I knew it worked. It felt like unlocking a new level of creative freedom.

Video Tutorial

If you’re more of a visual learner and prefer to watch things in action, I’ve also got you covered. There’s a helpful video that walks through the same process step by step. You can check it out here:

Sometimes seeing the clicks, taps, and flow makes it all click faster than reading. So if you’re stuck at any step, this video should clear things up.

Why This Trick Matters

Now you might be wondering, “Why go through all this hassle when I could just crop or resize the final image in Photoshop or another editor?” That’s a fair point, but here’s the difference: resizing after the fact often stretches, squishes, or crops your photo in ways that don’t look natural. By setting the aspect ratio at the generation stage, you get a clean and accurate result that fits perfectly without distortion.

This method is especially useful for content creators who need specific image sizes. For example:

1. YouTube thumbnails need a 1280x720 (16:9) resolution.
2. Instagram feed posts often work best with a 1080x1080 (1:1) square.
3. Instagram Stories and TikTok favor 9:16 vertical formats.
4. Blog headers or website banners may require custom dimensions.

Using this trick means your AI-generated images will be ready to go without extra editing. It saves time, keeps the quality intact, and ensures your designs look professional across platforms.

Conclusion

At first glance, Nano Banana on Google Gemini seems limited when it comes to aspect ratio control. It sticks to its default resolutions, and that can be frustrating if you’re working on a creative project that demands flexibility. But thanks to the Hugging Face tool, you don’t have to feel boxed in anymore.

By combining Nano Banana with the Aspect Ratio Change tool, you can unlock new creative possibilities. The process might look like a few extra steps, but once you’ve done it once or twice, it becomes second nature. Plus, the satisfaction of finally getting your images in the exact format you want is worth it.

So the next time you’re struggling to turn a portrait into a landscape, or trying to make a thumbnail for YouTube, remember this guide. With a little help from Hugging Face and the right prompt, you’ll have total control over your image resolutions in Nano Banana.

Give it a try—you might be surprised how much easier your creative process becomes once you’ve mastered this trick.