How to Set Your Midjourney Aspect Ratio (Image Dimensions)

If you're generating AI images with Midjourney, one of the first settings you'll want to learn is called aspect ratio. The aspect ratio determines the dimensions of your image.

In plain image, aspect ratio dictates whether your image is square, horizontal, or vertical. It's stated in width:height terms. Here are a few common aspect ratios:

  • 1:1 (square)
  • 2:1 (horizontal rectangle)
  • 1:2 (vertical rectangle)
  • 7:4 (approximately the dimensions of a TV screen)

Setting The Aspect Ratio in Midjourney

To set the aspect ratio of an image you're creating in Midjourney, you'll need to add the "--aspect" parameter to your prompt. For example, if you want a nice horizontal 2:1 image, you'll tack on this text to the end of your prompt:

--aspect 2:1

So the final prompt will look something like this:

/imagine prompt cat riding a broom over the moon --aspect 2:1

Midjourney also accepts the abbreviated parameter --ar, which does the exact same thing as --aspect.

/imagine prompt cat riding a broom over the moon --ar 2:1

You can either remember this syntax, or use our free Midjourney Prompt Helper which allows you to easily add aspect ratio and many other parameters to your Midjourney prompts:

Then simply drop this prompt into Midjourney, and let the bot do it's thing!

What is the Default Aspect Ratio in Midjourney?

Midjourney defaults to an aspect ratio of 1:1, which will generate a perfectly square image.