Image Dimension Calculator
Calculate new image dimensions when resizing while maintaining aspect ratio.
About this reference
A guide to image sizes: what dimensions to use for websites, social media and print, and how to resize without losing quality.
Use it to pick sizes before you export.
How to use it
- Find your platform.
- Note the recommended size.
- Resize with the Image Resizer tool.
Sizing principles
Export at the size you display it, times 2 for high-density screens. A 600px-wide image slot should use a 1200px-wide source. Print needs about 300 pixels per inch: a 6×4 inch print wants 1800×1200 pixels. Compress after resizing.
Worked example
Common sizes
| Instagram post | 1080×1080 |
| Instagram story | 1080×1920 |
| Facebook cover | 820×312 |
| YouTube thumbnail | 1280×720 |
| Blog hero | 1600×900 |
Tips and common mistakes
- Serve responsive images with srcset.
- Compress with WebP or AVIF.
- Check platform requirements; they change.
- Keep text away from edges when cropping.
- Name files descriptively.
Frequently asked questions
What size should web images be?
About 2× the displayed size, compressed.
What resolution for print?
300 pixels per inch.
What is the YouTube thumbnail size?
1280×720.
Does resizing reduce quality?
Shrinking is safe; enlarging is not.
Which format for photos?
JPEG or WebP.
Is it free?
Yes.