Image SEO Checker
Audit page images for alt text, dimensions, lazy loading, modern formats, and large known file sizes.
Free Image SEO Checker
Images affect accessibility, page speed, search visibility, and layout stability. This checker extracts image tags from a page and highlights missing alt attributes, large known files, missing dimensions, lazy loading usage, and modern image formats.
What good image SEO looks like
Meaningful images should have descriptive alt text, decorative images should use empty alt text, large images should be compressed, and dimensions should be set to reduce layout shift.
Performance and accessibility together
Image SEO is not only about image search. Smaller files improve load speed, and accurate alt text helps people using assistive technology understand the page.
Frequently Asked Questions
Should every image have alt text?
Every img tag should have an alt attribute. Meaningful images need descriptive alt text, while decorative images should use an empty alt attribute.
Are WebP and AVIF better for SEO?
They are often smaller than JPEG or PNG, which can improve page speed. The format itself is not a ranking shortcut.
Why do width and height attributes matter?
They help browsers reserve layout space before the image loads, reducing layout shift and improving perceived quality.
Can lazy loading hurt SEO?
Native lazy loading is usually fine, but important above-the-fold images should load promptly and be available in the HTML.
It's time to ditch Google Analytics.
Tired of the frustration, complexity and privacy issues of Google Analytics? We were too. That's why we built Swetrix - the ethical, open source and fully cookieless alternative.