Free HTML Language Attribute Checker

Verify that your HTML document has a valid lang attribute on the html element. Essential for screen readers and international SEO.

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

Paste your full page HTML (or just the <html> opening tag)

HTML Language Attribute Checker

Paste HTML above to check the lang attribute.

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