Video Standards
Full HD, 4K, and 8K video commonly use 16:9. Vertical video for stories, reels, shorts, and TikTok usually uses 9:16.
Browser-based proportions
Aspect Ratio Calculator
Calculate image, video, screen, and social media dimensions with instant dimension adjustment suggestions.
Calculated Ratio
Image Analysis
What Is Aspect Ratio?
An aspect ratio compares width and height. It helps videos, images, ads, and interface mockups keep the right shape across screens and platforms.
Images And Social Posts
Square posts use 1:1, portrait feeds often use 4:5, and link previews frequently sit close to 1.91:1.
| Format | Ratio | Common Use |
|---|---|---|
| Standard HD | 16:9 | TV, YouTube, monitors |
| Vertical | 9:16 | TikTok, Reels, Shorts, Stories |
| Square | 1:1 | Profile images, social posts |
| Portrait | 4:5 | Feed images and ads |
| Cinema | 2.39:1 | Wide film frames |
FAQ
What is aspect ratio?
Aspect ratio is the proportional relationship between width and height, usually written as two numbers such as 16:9, 4:3, or 1:1.
Does the image upload leave my browser?
No. The calculator reads the image dimensions locally in your browser and does not send the image to a server.
How do I make an image exactly 16:9?
Enter the image width and height, choose 16:9 as the target, and use the suggested width or height adjustment with the smaller dimension change.
Why are device presets searchable instead of always visible?
The catalog includes modern and classic devices, so search keeps the mobile layout fast while still making older models easy to find.