Make every image and video the right size.
Simple tools for aspect ratios, dimensions, resizing and social media formats. No sign-up. No uploads unless you choose an image checker.
Tools built for common jobs
Pick a tool and get a clear answer in seconds.
Aspect Ratio Calculator
Find a ratio from width and height, or calculate a missing dimension.
Use tool →Video Ratio Calculator
Get matching video dimensions for 16:9, 9:16, 1:1, 4:5 and more.
Use tool →Image Ratio Checker
Inspect an image's pixels, ratio, orientation and megapixels locally.
Use tool →Ratio Converter
Calculate a proportional fit and the largest crop for a target ratio.
Use tool →Social Media Sizes
Browse common image and video dimensions and copy them instantly.
Use tool →Common ratios
Popular dimensions at a glance.
| Ratio | Typical use | Example | Orientation |
|---|---|---|---|
| 1:1 | Square posts | 1080 × 1080 | Square |
| 4:3 | Classic photos / video | 1440 × 1080 | Landscape |
| 16:9 | HD video / YouTube | 1920 × 1080 | Landscape |
| 4:5 | Portrait social posts | 1080 × 1350 | Portrait |
| 9:16 | Short-form vertical video | 1080 × 1920 | Portrait |
| 21:9 | Ultrawide / cinematic | 2560 × 1080 | Landscape |
Free aspect ratio tools for images and video
AspectRatioZ helps you calculate, compare and convert image and video dimensions without an account. Enter width and height to find the ratio, choose a target ratio to calculate matching dimensions, or check an image locally in your browser.
Common formats include 16:9 for widescreen video, 9:16 for vertical video, 4:5 for portrait social posts, 1:1 for square content and 21:9 for ultrawide layouts.