HTML Lang Attribute check. Validates html lang attribute is set correctly.
Missing lang attribute breaks screen readers and prevents Google from auto-detecting language. The check verifies <html lang="en"> or appropriate locale. Run this check plus the other 79 in a full Crawlux audit of your domain. Free, no signup, ~4 minutes.
Free · No signup · 80 checks total · 8 audit modules
Enter your domain. Scan starts automatically.
Crawlux scans your full domain and runs HTML Lang Attribute along with 79 other checks. PDF report in your inbox in about 4 minutes.
200+ Web3 brands audited · No credit card · No setup
Three steps. Free PDF report in 4 minutes.
No signup wall. Enter your domain. We scan. You get the report.
Enter your domain
Type your crypto domain in the form above. We accept HTTPS URLs only (HTTP gets auto-upgraded). The scan runs against your live production site, not staging.
Crawlux runs 80 checks across 8 modules
Including HTML Lang Attribute and 79 others covering Technical SEO, AI Visibility, Token Schema, YMYL/E-E-A-T, Keyword Intent, Backlink Toxicity, Competitor Analysis. Each check produces a pass/fail/warn score.
Get the PDF report
Full report with module-by-module breakdown, severity-ranked action list, specific URLs that need fixes and recommended remediation patterns. Delivered to your inbox.
Beyond just HTML Lang Attribute, you get the full audit picture.
Six things the Crawlux audit gives you that generic SEO tools miss.
Crypto-tuned check logic
The HTML Lang Attribute check is built for Web3 specifically. Generic SEO tools either skip it or apply generic logic that misses crypto-specific signals like contract addresses, audit firm citations and chain declarations.
8 audit modules in parallel
This check is one of 80. The full audit runs all 80 in parallel against your live domain and produces a unified score plus action list. Single scan covers Technical SEO, AI Visibility, Token Schema and 5 other modules.
AI engine citation measurement
The audit measures actual citation frequency for your project across ChatGPT, Claude, Perplexity and Gemini. Plus the technical signals (schema, llms.txt, FAQ structure) that drive citation rate.
Competitor benchmarking
The audit identifies your top 5 organic and AEO competitors automatically and benchmarks your scores against theirs. Comparison data is the most actionable input for prioritizing fixes.
PDF deliverable for the team
The audit produces a white-label PDF report with module breakdowns, action lists and specific URLs. Easy to share with dev, content and marketing teams or external agencies.
Free first scan per domain
Run the full 80-check audit on your domain for free. No signup wall before the scan. No credit card. Result includes the HTML Lang Attribute check plus the other 79.
Common questions about the HTML Lang Attribute check
From crypto founders running pre-audit due diligence.
What is the HTML Lang Attribute check?
Missing lang attribute breaks screen readers and prevents Google from auto-detecting language. The check verifies <html lang="en"> or appropriate locale.
Why does html lang attribute matter for crypto projects?
The HTML Lang Attribute check is part of the Technical SEO audit module. Crypto projects competing for visibility in Google search and AI engines (ChatGPT, Claude, Perplexity, Gemini) need to pass this check because it directly affects either crawlability, citation accuracy or user trust signals. Failing this check usually shows up as lower organic rankings, lower AI citation rate, or both.
How does the HTML Lang Attribute check work?
The Crawlux audit tool scans your live domain and automatically runs the HTML Lang Attribute check across every relevant URL. Results are reported in the audit PDF with specific URLs, severity scores and recommended fixes. The full audit covers 7 other modules in addition to this one.
How long does running the HTML Lang Attribute check take?
The complete Crawlux audit runs in about 4 minutes for most domains. The HTML Lang Attribute check is one of dozens of checks that run in parallel. For domains with 100+ URLs the full scan can take 6-10 minutes.
What if my domain fails the HTML Lang Attribute check?
Failed checks come with specific fix instructions in the audit PDF. The HTML Lang Attribute check failures usually have one of three common root causes: missing implementation, incorrect implementation, or implementation that has drifted out of date. Each pattern has a different fix.
Is the HTML Lang Attribute audit free?
Yes. The first audit per domain is completely free, includes all 8 modules and produces a PDF report. No credit card required. After the first audit, additional re-scans of the same domain run on the paid plans.
Why the HTML Lang Attribute check is part of the Crawlux audit
The HTML Lang Attribute check is one of 80 individual audit checks that make up the full Crawlux scan. Missing lang attribute breaks screen readers and prevents Google from auto-detecting language. The check verifies <html lang="en"> or appropriate locale.
Why this check matters specifically for Web3
Generic SEO audit tools were built for e-commerce and B2B SaaS. They miss the specific signals that matter for crypto projects: token contract references, audit firm citations, multi-chain declarations, AI engine readability. The HTML Lang Attribute check is part of the Technical SEO module which Crawlux built specifically for Web3 brands.
What an audit failure looks like
When the HTML Lang Attribute check fails on a live domain, the symptom usually shows up as one of three patterns: lower organic rankings for branded queries, lower AI citation rate from ChatGPT and Perplexity, or higher bounce rate from search traffic. The HTML Lang Attribute check is mechanical to verify but mechanical to fix.
How the full audit covers the rest of the picture
Passing the HTML Lang Attribute check alone does not lift your overall Technical SEO score. The full audit runs 8-12 related checks across this module, plus 7 other modules covering Technical SEO, AI Visibility, Token Schema, YMYL/E-E-A-T, Keyword Intent, Backlink Toxicity and Competitor Analysis. The PDF report breaks down each module with a severity-ranked action list.
The 4-minute scan covers everything
Running the Crawlux audit is the fastest way to find out where your project stands across all 80 individual checks. The free tier scans one domain end-to-end and produces a PDF report with specific URLs, severity scores and recommended fixes for everything that needs attention.
Run the HTML Lang Attribute check plus 79 others.
Crawlux is our free audit tool — enter your domain and we scan all 80 checks across 8 modules in about 4 minutes. You get a PDF report with action items for everything that needs attention. No signup, no credit card.