---
title: "What Is an Aspect Ratio? | ImageQuarry"
url: https://www.imagequarry.com/faq/what-is-an-aspect-ratio/
last_updated: 2026-10-20
---

# What is an aspect ratio?

An aspect ratio is the shape of an image: its width compared to its height, written as two numbers such as 16:9 or 4:5. It says nothing about size. A 1600 x 900 image and a 3840 x 2160 image are both 16:9.

The first number is the width and the second the height, so 16:9 is wide, 9:16 is tall and 1:1 is square. To find a ratio, divide both sides by their largest common factor: 1080 x 1350 divides down to 4:5.

Platforms crop images that don't match the shape they display, which is why a photo can lose its edges when you post it. Choosing the ratio before you make the image keeps the important parts in frame.

In ImageQuarry, you can ask for a change to the composition in plain words and compare the new version with the last. Check the result against the shape your channel uses.

_Source: standard definition; examples are arithmetic. Checked October 20, 2026._

Next step: [What is the difference between 16:9 and 9:16?](https://www.imagequarry.com/faq/what-is-the-difference-between-16-9-and-9-16/)

## Related questions

- [What is the difference between 16:9 and 9:16?](https://www.imagequarry.com/faq/what-is-the-difference-between-16-9-and-9-16/): Same shape, turned: 16:9 is wide, 9:16 is tall.
- [What is a 4:5 aspect ratio used for?](https://www.imagequarry.com/faq/what-is-a-4-5-aspect-ratio/): A slightly tall portrait shape used in social feeds and 8 x 10 prints.
- [Can AI change the aspect ratio of an existing image?](https://www.imagequarry.com/faq/can-ai-change-the-aspect-ratio-of-an-image/): Yes, by cropping or by extending the image with new area.
- [What aspect ratio should I use for Instagram posts?](https://www.imagequarry.com/faq/what-aspect-ratio-for-instagram-posts/): 4:5 portrait for most feed posts.
- [What resolution are AI-generated images?](https://www.imagequarry.com/faq/what-resolution-are-ai-images/): Often about 1 megapixel by default; some models offer 2K or 4K.

Last reviewed 2026-10-20 by ImageQuarry.

## Get the framing right

Ask for the change you want in plain words and compare each new version with the last.