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How to add aspect ratio parameters on Midjourney

beginner 8 min read Updated 2026-03-18
Quick Answer

Add aspect ratio parameters to Midjourney by typing --ar followed by your desired ratio after your prompt. For example, use --ar 16:9 for landscape or --ar 9:16 for portrait orientations.

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Prerequisites

  • Discord account
  • Midjourney subscription or trial
  • Access to a Midjourney server or bot DM
  • Basic understanding of Discord text commands

Step-by-Step Instructions

1

Open Discord and navigate to Midjourney

Launch Discord and go to a Midjourney server channel or open a direct message with the Midjourney Bot. Make sure you're in a channel where you can use the /imagine command.
If you're new to Midjourney, start in the #newbies channels for better organization.
2

Start your prompt with /imagine

Type /imagine and press the spacebar. Discord will show you the command interface. Click in the prompt field or continue typing to enter your image description.
3

Write your image description

Enter your desired image prompt in the text field. For example: a serene mountain landscape at sunset. Keep your description clear and specific for better results.
Don't add the aspect ratio parameter yet - complete your main prompt first.
4

Add the aspect ratio parameter

At the end of your prompt, add a space followed by --ar and your desired ratio. Common ratios include:
  • --ar 1:1 for square images
  • --ar 16:9 for widescreen landscape
  • --ar 9:16 for mobile portrait
  • --ar 3:2 for standard photo ratio
You can use decimals like --ar 1.5:1 or simplified ratios like --ar 2:3.
5

Review your complete prompt

Your final prompt should look like: /imagine a serene mountain landscape at sunset --ar 16:9. Double-check that there's a space before the --ar parameter and that your ratio format is correct.
The aspect ratio parameter must come after your main prompt and any other parameters.
6

Submit your prompt

Press Enter to submit your prompt. Midjourney will begin generating four images with your specified aspect ratio. The generation process typically takes 30-60 seconds.
7

Review and upscale your results

Once generated, you'll see four images in your chosen aspect ratio. Use the U1, U2, U3, or U4 buttons to upscale your preferred image, or V1-V4 to create variations.
The aspect ratio will be maintained when you upscale or create variations of your chosen image.

Common Issues & Troubleshooting

Aspect ratio parameter not working

Ensure you're using the correct format --ar width:height with a space before --ar and a colon between numbers. Check for typos like -ar instead of --ar.

Images still appear in default square format

Verify the aspect ratio parameter is placed at the end of your prompt after all description text. Remove any extra spaces or characters after the ratio numbers.

Error message about invalid aspect ratio

Use supported ratios between 1:2 and 2:1 for most Midjourney versions. Extremely wide or tall ratios may not be supported. Try common ratios like --ar 4:3 or --ar 3:4.

Aspect ratio changes after upscaling

This shouldn't happen with properly applied parameters. If it does, try generating a new image with the same prompt and aspect ratio, or contact Midjourney support if the issue persists.

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