Free Lazy Loading Checker

Check images and iframes in your HTML for the loading="lazy" attribute. Flags elements missing lazy loading to improve initial page load.

100% client-side - your data never leaves your browser.

Paste page HTML

Paste HTML to check lazy loading on images and iframes.

- Hero images should use loading="eager" (or no attribute)

- Below-fold images should use loading="lazy"

- Iframes (YouTube, maps) should almost always be lazy loaded

Want automated scanning?

SCOUTb2 runs 25+ accessibility, performance, SEO, and security checks on any page automatically.