The Ideal Midjourney Aspect Ratio

By Jon Elordi

You can generate all the images you want in Midjourney, but if they have the wrong Midjourney aspect ratio, they won’t do you much good. Setting the aspect ratio in Midjourney is as easy as adding a parameter to the end of your image generation prompt.

In this post, we’ll review the default aspect ratios in MidJourney and how to change the aspect ratio in your Midjourney prompts.

How to Set Midjourney Aspect Ratio

To change the aspect ratio in a Midjourney prompt, add –ar [ratio of an image] to the end of a /imagine prompt. For example /imagine a bright blue rose sitting on an oak stump –ar 4:3 as compared to /imagine a bright blue rose sitting on an oak stump –ar 9:16

midjourney aspect ratio --ar 4:3
midjourney aspect ratio --ar 9:16

The aspect ratios you can use depend on your version of Midjourny. Version 5 and niji 5 allow you to do just about any aspect ratio. However, Midjourney version 4 can only do aspect ratios between 1:2 and 2:1. The various versions of Midjourney have different maximum aspect ratios. So, be mindful of the Midjourney version you are using.

There is a small bug with aspect ratios. Sometimes Midjourney will approximate a ratio of an image. For example –ar 16:9 will sometimes be rendered at 7:4. Usually it’s not a big deal, but it is worth being aware of.

Also, keep in mind that aspect ratio is not the same thing as resolution. Midjourney images are capped at 1 megapixel.

How to Change the Aspect Ratio of an Image in Midjourney with Zoom Functions

To change the aspect ratio of an image in Midjourney, you can use the Zoom Out functions. You can use the Zoom Out function on any image that you’ve upscaled. They appear below the image.

The Zoom Out 2x and the Zoom Out 1.5x buttons will take the generated image and extend the canvas outward while keeping the same aspect ratio.

The Make Square button does just that. It converts the generated image into a square image. The arrow emoji next to the button indicates in which area the canvas will be extended. The Custom Zoom button allows you to alter the prompt before expanding the image, giving you more control over the image. This is also where you can change the prompt and the aspect ratios.

Midjourney make square

You do not need to keep the original image prompt in the new prompt when using Custom Zoom. It will automatically keep what you have already generated.

For example, I took the square image above. Clicked on Custom Zoom and input this prompt: “A framed window on the wall in a log cabin –v 6.0 –ar 9:16 –zoom 2.” And got the image below.

As you can see, using Custom Zoom allows you to change the ar parameter in the prompt and produce unpredictable results. With the Custom Zoom function, you are adding a layer of complexity to the prompting, so expect there to be move variability.

How to Change the Aspect Ratio of an Image in Midjourney with Panning Functions

Aside from setting the aspect ratio parameter in the prompt or using the zoom function on upscaled images, you can also change the aspect ratio using the pan buttons on upscaled images.=

Pan buttons on Midjourney upscaled iamge.

By pressing the pan buttons, you can extend the canvas in any of the four directions available.

  • Using the Pan Left and Pan Right functions, you can expand a perfect square upscaled image and make it wider.

  • Using the Pan Up and Pan Down functions, you can expand a square upscaled image and make it taller.

The default aspect ratio in Midjourney is 1:1. If you Pan Up or Pan Down, the image aspect ratio will change from the default Midjourney aspect ratio to 2:3. If you Pan Left or Pan Right, the image aspect ratio will change from the default Mmidjourney aspect ratio to 3:2.

What is an Aspect Ratio? Why does Aspect ratio Matter?

When it comes to images and videos, the aspect ratio is the width to height ratio of the image. Aspect ratios are expressed using the w:h format. In the Midjourney aspect ratio parameter, the width and height must be whole numbers.

Depending on your project, you can try a different aspect ratio. The right aspect ratio can sometimes be difficult to figure out, but it’s important to remember that it matters. Having a small image in a slot where a wider aspect ratio is required can lead to image distortions. This can be easily avoided because Midjourney makes it easy to create a wider image.

Common Aspect Ratios

Here are a list of some of the different aspect ratios you may encounter:

  • 1:1 Default aspect ratio – Common for social media profile pictures

  • 4:3 mostly used for older televisions and computer monitors

  • 5:4 Common frame and print ratio.

  • 3:2 Common in print photography.

  • 7:4 Close to HD TV screens and smartphone screens.

  • 9:16 TikTok

  • 16:9 YouTube videos, Widescreen displays, Desktop wallpaper

  • 3:1 Twitter Banner

  • 4:1 LinkedIn Banner

  • 9:20 iPhone 14

In Midjourney images, aspect ratios greater than 2:1 and 1:2 are experimental and can produce unpredictable results.

The aspect ratio plays an important role when trying to create images in Midjourney. The aspect ratio impacts what kind of image you’ll produce and how the Midjourney images will appear. while making Midjourney images, there are several different ways to change the aspect ratio from the default ratio. You can use the Zoom function on a final upscaled image or you can use the Pan Functions depending on your project.

if you’re looking just to make quick edits. For example, if you want to make a taller image quickly or wider images, then you’re better off with the Pan Functions. But if your final creation has intricate details, then using the Zoom functions will likely give you the control you need.