DEVELOPER UTILITIES
Image File & Optimization Inspector
Images are usually the heaviest part of a page and often its Largest Contentful Paint. Oversized JPEGs, missing dimensions and a lazy-loaded hero image each cost speed. This inspector reads a page’s image tags and checks each file.
- Checks the live page
- Public addresses only
- Free, no sign-up
- CheckFiles over 300 KB and 1 MB
- CheckJPEG, PNG and GIF where WebP or AVIF would be smaller
- CheckImages without width and height
- CheckThe first image lazy-loaded
Free
no sign-up
Live
fetched when you run the check
6 checks
what the tool looks at
30 a minute
checks per visitor, to keep it free
Loading the tool…
HOW IT WORKS
How to use the Image File & Optimization Inspector
One public page URL; the first 20 images are checked.
Enter a page with typical images, such as a product or category page.
Fix the largest files and the first image’s loading first.
Check again after uploading compressed WebP or AVIF versions.
WHAT IT CHECKS
What it looks at, and how to read it.
A table of image files with their type, size and problems, and a CSV export.
What it checks
- Files over 300 KB and 1 MB
- JPEG, PNG and GIF where WebP or AVIF would be smaller
- Images without width and height
- The first image lazy-loaded
- Large images without srcset
- Cache lifetime under a week
How to read the results
- The first large image is usually the LCP element; it should load eagerly and be small.
The concepts behind it, in the SEO glossary: Core Web Vitals, Largest Contentful Paint, Cumulative Layout Shift.
GOOD TO KNOW
Common mistakes, an example and the limits.
Common mistakes
- Lazy-loading every image, including the one at the top of the page.
A worked example
A category page’s banner is a 1.8 MB PNG, lazy-loaded; a 150 KB WebP loaded eagerly halves its LCP.
Limitations
- Checks the HTML the server sends. Content a page adds with JavaScript after loading is not seen.
- Some sites block or challenge automated requests; then the result shows what a crawler without a browser would get.
- Images set in CSS backgrounds or added by scripts are not seen.
- Sizes come from the Content-Length header; files served without it show no size.
FAQ
Questions about the Image File & Optimization Inspector
Straight answers about what it does and where its limits are.
Does image file size affect rankings?
Not directly; it affects loading speed, which Core Web Vitals measure.
Need this for a whole website, over time?
The NdovuSEOLabs platform connects your own Search Console, analytics and server logs, and audits every page on a schedule.