What is aspect ratio?
Aspect ratio describes the relationship between width and height, such as 16:9, 4:3, 1:1, or 9:16. Keeping the correct ratio prevents images and videos from looking stretched or cropped incorrectly.
Common ratios
Use 16:9 for YouTube thumbnails and widescreen video, 1:1 for square posts, 4:5 for many feed images, and 9:16 for vertical stories, reels, and shorts. Each platform may have its own preferred size.
How to calculate aspect ratio
- Open the Aspect Ratio Calculator.
- Enter the current width and height.
- Type the new target width or height.
- Use the matching value to resize without distortion.
Resize workflow
After calculating the target dimensions, use Resize Image or Resize Image for Instagram to prepare the final file.
Common mistakes
Do not manually stretch width or height without matching the ratio. This can distort faces, logos, screenshots, and product photos. Crop intentionally only when the platform requires it.
Frequently Asked Questions
Read answers to the most common questions about this format and conversion process:
16:9 is common for widescreen video, YouTube thumbnails, and presentations.
Instagram stories and reels commonly use a vertical 9:16 ratio.
Yes. Keeping the ratio consistent prevents distorted images and videos.
Yes. Use Resize Image to apply the calculated dimensions.