Which images does it download?

It checks every image tag on the page and downloads the first 12 image files to find broken links, heavy files, formats that could be WebP or AVIF, and images far larger than they are shown.

Should I lazy-load every image?

No. Lazy-load images below the fold, but load the main image right away, because lazy-loading it delays Largest Contentful Paint.

Why set width and height on images?

They let the browser reserve space before the image loads, which stops the layout from shifting.

How much does the Image SEO Checker cost?

10 credits per run, shown before the run starts. An AI agent can run the same tool over the REST API or MCP with a workspace API key.

Pricing

SEO · On-page SEO · 10 credits

Image SEO Checker: Alt Text, Size & Format

Find images missing alt text or dimensions, broken image files, and heavy or oversized images slowing the page down.

Image SEO Checker 1.0.0 · price b26-v1 · retrieved at run time · Run it from an AI agent

What the Image SEO Checker checks

Check every image on a page for alt text, width and height, lazy-loading of the main image, srcset and sizes, and script-only loading. The first 12 image files are downloaded to catch broken links, JPEG or PNG files that could be WebP or AVIF, heavy files and images far larger than they are shown.

Alt text, width and height on every image
Lazy loading of the main image, srcset and sizes
Broken, heavy or oversized image files
JPEG or PNG files that could be WebP or AVIF

What it does not do

Images added by JavaScript after load
Stylesheet background images
Compressing or converting files

Questions about the Image SEO Checker

Which images does it download?: It checks every image tag on the page and downloads the first 12 image files to find broken links, heavy files, formats that could be WebP or AVIF, and images far larger than they are shown.
Should I lazy-load every image?: No. Lazy-load images below the fold, but load the main image right away, because lazy-loading it delays Largest Contentful Paint.
Why set width and height on images?: They let the browser reserve space before the image loads, which stops the layout from shifting.
How much does the Image SEO Checker cost?: 10 credits per run, shown before the run starts. An AI agent can run the same tool over the REST API or MCP with a workspace API key.