Paste your <link rel='alternate'> tags and validate language + region codes against ISO 639-1 / ISO 3166-1. Catches missing x-default and duplicate codes.
An hreflang checker validates the hreflang link tags on your website to ensure search engines correctly serve the right language and regional version of your pages to users in different countries. Hreflang is an HTML attribute used in <link rel='alternate'> tags that tells Google, Yandex, and other search engines about the language and geographic targeting of alternate versions of a page. For example, if you have English, Spanish, and Hindi versions of the same content, hreflang tags prevent Google from treating them as duplicate content and ensure Spanish-speaking users in Mexico see your Spanish page while English-speaking users in the US see your English page. Incorrect hreflang implementation is one of the most common international SEO mistakes -- invalid language codes, missing x-default fallbacks, and duplicate values silently break your multi-language targeting. This tool parses your hreflang tags, validates language codes against ISO 639-1 and region codes against ISO 3166-1, and flags missing x-default tags, duplicate entries, and malformed codes.
Copy all <link rel="alternate" hreflang="..."> tags from your page source and paste them into the editor. You can paste multiple tags at once -- the tool parses all of them in a single pass.
The tool instantly checks each tag for valid ISO 639-1 language codes and ISO 3166-1 region codes. Valid tags appear in green; invalid ones in red. A summary shows the total issue count.
Address any issues like missing x-default fallback, duplicate hreflang values, or invalid language/region codes. Edit your tags and re-paste to verify the fixes before deploying to your site.
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