How many websites pass the Lang check?

Based on 596 audited sites · Updated 2026-07-16

90.3%of audited sites pass this check↓1% vs last month

95% confidence interval: 87.6%–92.4%

About This Check

The HTML lang attribute helps AI systems understand the content language for proper localization and response generation.

Why This Matters

LLM Discoverability

The HTML lang attribute allows AI systems to route page content to the correct language model and apply appropriate tokenisation and summarisation pipelines for the language in question.

SEO Impact

The lang attribute is a prerequisite for hreflang to function correctly in multilingual setups, and it influences language-specific ranking in localised search markets.

What To Do Next

9.7% of audited sites need attention on lang (58 of 596 sites are warning or failing).

Prioritize lang on templates that create many URLs, because one template fix can improve a large share of html extractability & main content clarity.
After changing the page, re-run the audit and compare the observed value for this check instead of relying on visual inspection alone.
Use the 90.3% pass rate as a benchmark: if your site fails here, passing the check moves it closer to the visible majority of crawlable, AI-readable pages.

Status Breakdown

90.3%pass(538)

9.7%warn(58)

0%fail(0)

Compliance Trend

Daily pass, warning, and failure rates across benchmark snapshots (up to 90 days).

Industry Breakdown

How different industries perform on this check.

94% of audited Media & Entertainment sites pass this check (n=84), compared with 76.7% of E-Commerce sites (n=30).

credible samples first · then pass rateshown-industry average 90.4%

Industry pass rates, average audit scores, and sample sizes. A marker in each pass-rate bar shows the weighted average across the displayed industries.
Industry	Pass rate	Avg score	Sites
Media & Entertainment	94%	73.8	84
Education	93.3%	71.8	30
Travel & Hospitality	92.2%	74.8	51
Technology	89.9%	72	278
Finance & Banking	87.2%	72.8	39
E-Commerce	76.7%	69.6	30
Healthcare	100%	76.7	9limited
Automotive	100%	75.6	5limited
Professional Services	100%	80.8	4limited
Retail	100%	78.3	3limited

Related Checks

Run a free audit to see whether your site passes this check, or browse the leaderboard and the audited-sites directory.