Adjust image aspect ratio in Midjourney

Midjourney Try it →Watch full video →Woollyfern · Jan 2026

Demo summary

The creator demonstrates how to use the --ar parameter in a prompt to change image dimensions and shows how to set a default aspect ratio in the Midjourney settings menu.

Step-by-step

Type your prompt into Midjourney
Add --ar at the end of the prompt followed by a space
Enter the desired width and height separated by a colon
Go to Settings to change the default aspect ratio by clicking and dragging the slider dot

Options

Use 1:1 for square images
Use a smaller first number for tall images (e.g., 1:2)
Set a permanent default like 16:9 in the settings menu

Watch out for

Parameters must start with two dashes
Aspect ratios must be written as width colon height

Tips

Manually adding a parameter to your prompt will override any default settings you have configured

All demos from “Get BETTER Midjourney Results: 4 Parameters to Master First | Beginner's Guide 2026”

0:171:09Adjust image aspect ratio in MidjourneyCurrentThe creator demonstrates how to use the --ar parameter in a prompt to change image dimensions and shows how to set a default aspect ratio in the Midjourney settings menu.Midjourney· AI Crop Image
1:361:09Increase image variety with the Chaos parameterThe video shows the effect of the --chaos (or --c) parameter on image grids and demonstrates adjusting the 'variety' slider in the settings to change the default chaos value.Midjourney· AI Image Generator
2:450:59Control artistic style with Midjourney StylizeThe demonstration shows how the --stylize parameter affects the artistic interpretation of a prompt and how to adjust the default stylize value within the software settings.Midjourney· AI Image Generator
4:080:44Switch Midjourney model versionsThe creator shows how to select different AI models (like V7) using the --version parameter in a prompt or by selecting a model in the version settings menu.Midjourney· AI Image Generator
Watch “Get BETTER Midjourney Results: 4 Parameters to Master First | Beginner's Guide 2026” →

AI Crop Image

5:310:41Adjusting Aspect Ratios in MidjourneyThe creator shows how to use the web interface sliders and manual text input to change image dimensions, including extreme ratios for 8-bit side-scrollers.Futurepedia
0:171:09Adjust image aspect ratio in MidjourneyCurrentThe creator demonstrates how to use the --ar parameter in a prompt to change image dimensions and shows how to set a default aspect ratio in the Midjourney settings menu.Woollyfern