> For the complete documentation index, see [llms.txt](https://hoangs-organization-8.gitbook.io/midjourney-mastery/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hoangs-organization-8.gitbook.io/midjourney-mastery/2.-beginner-guide/parameter/aspect-ratio.md).

# Aspect Ratio

A square image has equal width and height, described as a 1:1 aspect ratio. The image could be 1000px × 1000px, or 1500px × 1500px, and the aspect ratio would still be 1:1. A computer screen might have a ratio of 16:10. The width is 1.6 times longer than the height. So the image could be 1600px × 1000px, 4000px × 2000px, 320px x 200px, etc.

The default aspect ratio is 1:1.\
`--aspect` must use whole numbers. Use 139:100 instead of 1.39:1.\
The aspect ratio impacts the shape and composition of a generated image.\
Some aspect ratios may be slightly changed when upscaling.

***

#### Max Aspect Ratios

Different Midjourney Version Models have different maximum aspect ratios.

|        | Version 5 | Version 4  | niji 5 |
| ------ | --------- | ---------- | ------ |
| Ratios | any\*     | 1:2 to 2:1 | any\*  |

The `--ar` parameter will accept any aspect ratio from 1:1 (square) up to the maximum aspect ratio for each model. However, final outputs may be slightly modified during image generation or upscaling. Example: prompts using `--ar 16:9` (1.78) create images with a `7:4` (1.75) aspect ratio.

\* Aspect ratios greater than 2:1 are experimental and may produce unpredicatble results.

![Comparison of common Midjourney Aspect Ratios](//cdn.document360.io/3040c2b6-fead-4744-a3a9-d56d621c6c7e/Images/Documentation/MJ_AspectRatioChart.png)

prompt example: `imagine/ prompt` `vibrant california poppies --ar 5:4`

#### Common Midjourney Aspect Ratios

`--aspect 1:1` Default aspect ratio.\
`--aspect 5:4` Common frame and print ratio.\
`--aspect 3:2` Common in print photography.\
`--aspect 7:4` Close to HD TV screens and smartphone screens.

***

### Changing the Aspect Ratio of an Image

Do you love an image you have generated but wish it taller or wider? You can use the `🔎 Zoom Out` buttons on any upscaled image to [change the aspect ratio of your image](https://hoangs-organization-8.gitbook.io/midjourney-mastery/2.-beginner-guide/parameter/zoom-out). The Midjourney Bot will fill in the new space with additional content informed by your prompt and the original image.

***

### How to Set the Aspect Ratio

#### Use Aspect Ratio Parameters

Add `--aspect <value>:<value>`, or `--ar <value>:<value>` to the end of your prompt.

![Animated Gif showing how the Midjourney version parameter is typed](//cdn.document360.io/3040c2b6-fead-4744-a3a9-d56d621c6c7e/Images/Documentation/MJ_Parameter_Aspect.gif)