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Scan all images on a page for SEO best practices. Check alt text presence and quality, lazy loading attributes, image dimensions, modern format usage (WebP, AVIF), and oversized image detection.
Best for
Use this tool when you need one sharp answer fast before opening a broader report.
The input and results are designed to stay readable and tappable on smaller screens.
This page targets both broad keywords and practical queries people use before they audit a specific domain.
Frequently asked questions
Yes — the Image SEO Checker is 100% free with no signup, no account, and no usage limits. Just enter a URL and get instant results.
Our Image SEO Checker runs live checks against the target website in real time. Results reflect the current state of the site at the moment you run the check — not cached or historical data.
Very important — alt text helps search engines understand image content, improves accessibility, and enables Google Image Search ranking. AI models also use alt text to understand page context. Every image should have descriptive, keyword-relevant alt text.
Both are excellent modern formats. WebP has 95%+ browser support and offers 25-35% smaller files than JPEG. AVIF offers 50%+ savings but has lower browser support (~90%). Use WebP as default with AVIF as progressive enhancement.
Lazy loading below-the-fold images improves Core Web Vitals (especially LCP) and reduces initial page weight. Use loading='lazy' on images that aren't visible in the initial viewport. Never lazy-load the hero/LCP image.