How this free tool helps
Image SEO is broader than alt text alone. This checker focuses on observable markup signals and does not invent compression or visual-quality measurements.
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Free Image SEO Checker
Review images on a public page for important SEO, accessibility and layout signals. Check alt attributes, declared dimensions and lazy-loading usage to find practical image optimization opportunities.
Review images for accessibility and performance
Useful image markup includes appropriate alternative text, dimensions where practical and loading behaviour suited to the image’s role. Decorative and informative images should be treated differently.
Common mistakes to avoid
Stuffing keywords into alt text, lazy-loading the main hero image indiscriminately or serving huge source files can hurt accessibility or performance.
What to do after using this tool
Write purpose-based alt text, reserve layout space, resize/compress assets and use responsive modern formats where they improve delivery.
Frequently Asked Questions
What image SEO signals does the checker review?
It reviews observable image markup such as alt attributes, width and height information and lazy-loading signals so you can identify common accessibility, layout and performance opportunities.
Does every image need descriptive alt text?
Informative images generally benefit from meaningful alternative text, while purely decorative images may appropriately use an empty alt attribute. Alt text should describe purpose, not be stuffed with keywords.
Why do image dimensions matter?
Declared dimensions can help browsers reserve layout space before an image loads, reducing layout movement. Actual performance also depends on file size, format, responsive sources and delivery.
Does every image need descriptive alt text?
No. Informative images generally need useful alternatives, while purely decorative images can use an empty alt attribute when implemented appropriately.
Why do width and height attributes matter?
Declared image dimensions can help the browser reserve layout space before the file loads, reducing avoidable layout shifts when the rendered dimensions are handled correctly.
Continue Your SEO Workflow
Compare website appearance and performance using Website Screenshot Generator, Website Browser by Country, Mobile Website Tester and Core Web Vitals & PageSpeed Checker. Each check covers a different aspect of your website, so compare the evidence before making changes.