Should every image have alt text?

Every image needs an alt attribute. Informative images need a short description; purely decorative images can use an empty alt="".

Why set width and height on images?

They let the browser reserve space before the image loads, which prevents layout shift and improves Core Web Vitals.

What file size is too big?

There is no fixed limit, but images over about 200-300 KB usually slow pages down. WebP or AVIF files are often much smaller than JPG or PNG.

Image SEO & Alt Text Checker

Category: SEO & Analytics • Free Online Utility

Enter a URL to list its images with alt text, file size, dimensions and format. The checker flags missing or filename-like alt text, images over 300 KB, missing width and height that cause layout shift, images that could use WebP or AVIF, missing lazy loading and broken image links.

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