Aspect Ratio Resize Calculator
Aspect Ratio Resize
Calculate new dimensions when resizing images or video while maintaining or converting between aspect ratios.
Formula
Output Height = Width / Aspect Ratio; Crop Width = min(Source Width, Source Height x Aspect Ratio); Crop Height = min(Source Height, Source Width / Aspect Ratio)
Frequently Asked Questions
What aspect ratio is best for social media?
Instagram feeds use 1:1 or 4:5, Stories and Reels use 9:16, YouTube uses 16:9, and TikTok uses 9:16. Each platform has its preferred ratio.
What happens when I change aspect ratio?
Changing aspect ratio requires either cropping (cutting parts of the image), letterboxing (adding black bars), or stretching (distorting the image). Cropping is usually preferred.
What is the most common video aspect ratio?
16:9 is the standard for most video content including TV, YouTube, and streaming. Cinema uses wider ratios like 2.39:1 or 21:9.