The short version
The most reusable ratios are 1:1 for square media, 4:5 and 3:4 for portraits, 3:2 and 4:3 for photography, 16:9 for widescreen video, 9:16 for vertical video and 21:9-class formats for ultrawide displays.
What matters most
- A common ratio is not automatically the required ratio.
- Platform specifications can change, so verify before final export.
- Capture at higher resolution and with safe edge space when multiple crops are expected.
How to apply it
- Identify whether the destination is print, screen, video or social media.
- Choose the shape that matches its display container.
- Select proportional pixel dimensions.
- Test the result in the actual destination rather than relying only on the editor preview.
Reference table
| Ratio | Decimal | Typical role |
|---|---|---|
| 1:1 | 1.00 | Square artwork |
| 4:5 | 0.80 | Feed portrait |
| 3:2 | 1.50 | Photography |
| 4:3 | 1.33 | Photography and classic displays |
| 16:9 | 1.78 | Widescreen video |
| 9:16 | 0.56 | Vertical video |
| 21:9 class | About 2.33 | Ultrawide displays |
Use exact dimensions and units in production notes; familiar labels can describe more than one standard.
Common mistakes to avoid
- Assuming a platform accepts only one ratio.
- Using a familiar name such as 21:9 without checking the exact pixel ratio.
- Choosing resolution before deciding composition.
Continue with the right tool
Use a calculator to check the numbers against your own source and destination instead of relying on a generic preset.
Related guides
What Is Aspect Ratio? A Practical Guide to Image and Video Shape
Understand aspect ratio, how width and height form a ratio, why it differs from resolution, and how to choose the right shape for images and video.
Aspect ratio basicsHow to Find an Aspect Ratio from Width and Height
Find and simplify any aspect ratio from pixel dimensions, with worked examples, decimal ratios and guidance for non-standard sizes.
Aspect ratio basicsHow to Change Aspect Ratio Without Ruining the Composition
Choose between crop, padding and reframing when changing an image or video aspect ratio, with a practical decision process.
Frequently asked questions
What is the most common video ratio?
16:9 is the standard widescreen shape for most horizontal online video and televisions.
What ratio do phone photos use?
It varies by camera setting and device; 4:3 is common, while some modes crop to 16:9 or other shapes.
What ratio is best for every platform?
There is no universal best ratio. Choose based on the placement and viewing context.