Image Resizer
Resize images to an exact width and height or a maximum size, keeping the aspect ratio. Runs locally…
Aspect Ratio Calculator
Find the aspect ratio of any width and height, and calculate a new width or height that keeps the same proportions. Includes common presets and the CSS aspect-ratio value.
How to use
- Enter the original width and height, or pick a preset such as 16:9.
- Type a new width to get the matching height, or a new height to get the width.
- Copy the CSS aspect-ratio declaration if you need it.
What this tool does
The ratio is reduced by the greatest common divisor (1920 × 1080 becomes 16:9). New dimensions are rounded to whole pixels.
Frequently asked questions
What ratio is a 1200 × 630 Open Graph image?
About 1.91:1 (exactly 40:21).
How do I keep a video area responsive?
Use the CSS aspect-ratio property, for example aspect-ratio: 16 / 9, with width: 100%.
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