Free HTML Lang Checker
Read the root html[lang] value for language declaration.
Validate html lang attribute for international SEO and accessibility.
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Instant results for any public URL. We may email follow-up tips; no credit card required for this check.
Get a full-site SEO report in the dashboard →About this free html lang attribute checker
The html lang attribute declares the primary language of a document. Screen readers and search engines use it for pronunciation and regional relevance.
Confirm lang is set correctly on each template, especially after translations or subdomain splits.
What it checks
- lang attribute on the <html> element
- Whether a value is present and non-empty
Why it matters for SEO
- Accessibility for assistive technology
- Supports correct language targeting with hreflang
- Avoids mismatched language signals vs content
How to use this tool
- Verify each locale uses the right ISO code (e.g. en, nb, de).
- Fix theme defaults that omit lang.
- Pair with hreflang for multi-country sites.
Common issues we help you catch
- Missing lang on SPA or custom themes
- lang=en on fully translated Norwegian pages
- Invalid codes like en-US vs en-us inconsistency
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Frequently asked questions
- lang vs hreflang — what is the difference?
- lang describes this document’s language. hreflang links alternate language/regional versions of the same or equivalent content.