HTML Lang Attribute Checker

Confirm that every page declares the correct <html lang=""> attribute for accessibility and international SEO.

HTML source

Ensure assistive tech speaks the right language

Without a proper lang attribute, screen readers default to English and search engines miss regional context. This checker gives you a quick yes/no answer before launch.

Accessibility

Lang Inspector

<html lang="en-us">
  ...
</html>

How It Works

The HTML Lang Attribute Checker runs entirely in your browser using JavaScript. Unlike other tools that send your data to a server, we process everything locally on your device. This guarantees 100% privacy and blazing fast speed.

No server interaction – data never leaves your device
Instant results since there is no network latency
Works offline once the page is loaded
Free to use with no usage limits

How to Use

Paste HTML

Provide any HTML snippet or full page source.

Run validation

The checker locates the <html> element and inspects its lang attribute.

Fix issues

We explain whether the attribute is missing, empty, or invalid.

Frequently Asked Questions

Why is lang important?

Screen readers and search engines rely on the lang attribute to understand pronunciation and ranking context.

What format should lang use?

Use ISO 639 codes optionally followed by a region: en, en-gb, fr-ca, etc.

Can I set lang via JavaScript?

It is best to declare it directly in HTML to avoid flashes before scripts run.

Where else should I specify language?

Hreflang tags complement lang by pointing to alternate URLs. Both help international SEO.

Do I need lang on every tag?

Set lang on <html>. Only override on specific elements when they switch language mid-page.

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The HTML Lang Attribute Checker is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.