Free SEO Tools
Image Dimensions Checker
Enter a URL to see every image's declared width, height, and aspect ratio.
About this tool
This reads the width/height HTML attributes declared in markup — it doesn't download and measure the actual image file, so a mismatched attribute won't be flagged as wrong, only as present or missing.
Frequently Asked Questions
- What does this show?
- Every image's declared width, height, and aspect ratio, and flags images missing dimensions.
- Why do missing dimensions matter?
- They can cause layout shift as the page loads, a Core Web Vitals factor — not necessarily a direct SEO penalty on its own.
- Does this check the actual image file size?
- No, it reads the width/height HTML attributes declared in markup, not the downloaded file dimensions.