How to Change the Aspect Ratio in Midjourney

How to Change the Aspect Ratio in Midjourney

  02 Jan 2024

Key Takeaways

  • Change the aspect ratio in Midjourney with the –ar parameter for portrait and landscape orientations.
  • Use specific aspect ratios for social media platforms like Instagram, LinkedIn, Facebook, and YouTube.
  • Adjust aspect ratios for printing posters of different sizes, and upscale for the highest quality.

The aspect ratio parameter in Midjourney is what you need to create images that will look fantastic in print, on social media, or as wallpaper backgrounds. Use this guide to break out of the default 1:1 square image dimensions.

The Aspect Ratio Parameter in Midjourney

To change the aspect ratio of images in Midjourney you can use the parameter –aspect or –ar followed by a ratio. This parameter is always placed at the end of the prompt.

By default, Midjourney images are created with a 1:1 aspect ratio, meaning that both the width and length are the same, producing a square image.

It takes some time to get familiar with different aspect ratios and when they are used, so in this guide we’ll explain the ones worth knowing and what you can use them for.

Creating Portrait Images in Midjourney

2:3 Aspect Ratio

Let’s start with the basics. To create a portrait image, add –ar 2:3 to the end of your prompt. Another alternative is –ar 4:5, which has a shorter vertical height but is a little bit wider.

Even if the numbers mean nothing to you, you will definitely have used portrait orientation in photography before. When it comes to generating images of peoples’ faces, portrait is the format that looks the most pleasing.

Creating Landscape Images in Midjourney

Midjourney landscape aspect ratio example of cyberpunk markets in Hong Kong
7:4 Aspect Ratio

To capture a great landscape image try using –ar 3:2, which is a common aspect ratio used in photography. You also have the option of using –ar 5:4, or for a widescreen look, give –ar 7:4 a try.

The landscape orientation works effectively to give a sense of vast space, especially when it comes to natural landscapes or scenes which stretch out across the horizon.

Creating Wallpapers for Screens in Midjourney

Creating a phone wallpaper using AI is a great way to make use of the art you generate with Midjourney or any other AI art generator of your choice.

Far from being limited to just phone wallpapers, you can use the –ar parameter to create an image in the right dimensions for any device or screen.

While there are some common aspect ratios used for laptops, computers and phone screens, new designs are released every year, making it difficult to give a one-size fits all number. The best method is to search for the aspect ratio of your specific screen, whatever model of device you have.

However, if you’re not worried about precise measurements, here are some aspect ratios you can try to at least get you in the right ball park.

  • iPhone 15 –ar 90:195
  • Galaxy S22 –ar 90:195
  • Widescreen laptop/monitor screens –ar 16:10 or –ar 16:9
  • Ultrawide monitors –ar 21:9

If you come across ratios that include a decimal place, for example 19.5:9 (the specification for the iPhone 15), make sure to convert it to a whole number. In this case, that would mean re-writing the ratio to 195:90 by moving the decimal one place to the right on both numbers.

Creating Midjourney Art for Social Platforms

Midjourney landscape aspect ratio example of green rolling hills
191:100 Aspect Ratio

Looking for a specific aspect ratio for social media posts? Maybe you want to add some color to your LinkedIn profile or post some of your AI art to Instagram. Here are some of the most common aspect ratios you might need to do the job.


  • Instagram Story Size –ar 9:16
  • Instagram Post Vertical –ar 4:5
  • Instgram Post Landscape –ar 191:100


  • LinkedIn Profile Banner –ar 4:1
  • LinkedIn Profile Image –ar 1:1 (default in Midjourney)


  • Facebook Cover Photo –ar 16:9
  • Facebook Profile Picture –ar 1:1 (default in Midjourney)


  • YouTube Channel Art –ar 16:9
  • YouTube Thumbnail –ar 16:9
  • YouTube Profile Image –ar 1:1 (default in Midjourney)

Printing Midjourney Images

Midjourney portrait aspect ratio example of an astronaught in space-1
2:3 Aspect Ratio

Another great way to display your AI art is to print it out and hang it in your home. There are a number of apps for visualizing your art on a wall that will aid you in decorating your space.

When aiming to produce a large print, don’t forget to hit the upscale button in Midjourney to ensure the highest possible quality. Our guide on how to use Midjourney provides an overview of how to use the upscale feature if you haven’t done so previously.

Below you will find the aspect ratios you need for common poster sizes intended for print.

  • Small (11″ x 17″) –ar 1.1.55
  • Medium (18″ x 24″) –ar 3:4
  • Concert (24″ x 36″) –ar 2:3
  • Movie (27″ x 40″) –ar 2:3

With the aspect ratio parameter and a few go-to numbers, you can explore more uses for your AI-generated art. It will give you the chance to expand your designs beyond the default square dimensions in Midjourney, making your images look more aesthetically pleasing. So, keep these different aspect ratios handy for when you need them.

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