Free SEO Tools
Lazy Loading Checker
Enter a URL to see which images and iframes use native lazy loading.
About this tool
This checks the native HTML loading attribute only — it doesn't detect JavaScript-driven lazy-loading libraries that don't use this attribute.
Frequently Asked Questions
- What does this check?
- The native HTML loading attribute on images and iframes only.
- Does this detect JavaScript lazy-loading libraries?
- No, only the native loading="lazy" attribute — not third-party libraries that don't use it.
- Should every image use lazy loading?
- No — images visible on load generally shouldn't use it; it's meant for below-the-fold content.