Hreflang Tester — Validate International SEO Tags Online

Test and validate hreflang tags for international SEO. Check for errors, missing tags, and proper implementation.

Catch Hreflang Errors Before They Hurt Rankings

Incorrect hreflang tags cause the wrong language version of your site to appear in search results, leading to higher bounce rates and lost conversions. This tool validates your implementation in seconds so you can fix issues before they reach Google's index.

International SEO validation

Why Use This Tool?

Reciprocity Check

Automatically verify that every hreflang link has a matching return link on the referenced page — one of the most commonly missed requirements.

Language Code Validation

Detect invalid BCP-47 codes like "en-UK" (wrong) versus "en-GB" (correct) that silently break international targeting.

Broken URL Detection

Find alternate URLs that return 4xx or 5xx errors, which prevent Google from associating language versions correctly.

x-default Awareness

Check whether your global selector or fallback page uses x-default correctly so users without a matching locale get the right experience.

How this Hreflang Tester — Validate International SEO Tags Online works

This SEO validation tool audits webpage hreflang implementations, detecting errors like missing reciprocal links, incorrect language codes, conflicting signals, or broken alternate URLs that prevent proper international search visibility. The tester crawls specified URLs extracting hreflang annotations from HTML link tags, HTTP headers, or XML sitemaps, then validates completeness, syntax correctness, and reciprocity requirements where each referenced page must reference back. Reporting highlights specific issues per URL with categorized severity (critical errors blocking functionality versus minor warnings suggesting improvements), provides fix recommendations, and documents compliant implementations for comparison. Bulk testing processes entire domains identifying patterns of misconfiguration, comparison features validate consistency across language variants, and export functions produce audit reports for client documentation. Common uses include pre-launch validation ensuring international site launches with correct targeting, diagnosing traffic anomalies where wrong-l anguage content appears in search results, competitive analysis examining how rivals structure multilingual SEO, or ongoing monitoring detecting inadvertent changes breaking international optimization during site updates.

How to use this Hreflang Tester — Validate International SEO Tags Online

Enter your page URL

Paste the URL of the page whose hreflang tags you want to test into the input field.

Run the validation

Click Test to fetch and analyze the hreflang annotations from HTML link tags, HTTP headers, or your XML sitemap.

Review the report

Check the results for missing return links, invalid language codes, broken URLs, and other common implementation errors.

Example Usage

The tester surfaces specific issues per URL so you can fix hreflang errors before they affect international search rankings.

Input

https://example.com/en/about — page with hreflang tags for en, es, and fr versions

Output

Error: /es/about is missing a return link back to /en/about. Warning: /fr/about uses "fr-FR" but no x-default tag found.

Frequently Asked Questions

What does the hreflang Tester check?

It checks your hreflang setup for common issues like missing return links, invalid language/region codes, broken URLs, and inconsistent mappings between alternate pages.

What is a return link and why does it matter?

A return link means if Page A points to Page B as an alternate, Page B should also point back to Page A. Missing return links can weaken or break hreflang signals.

Can hreflang fix duplicate content problems?

hreflang helps search engines serve the right version by locale, but you should still use correct canonicals and keep versions consistent. hreflang is not a replacement for canonical tags.

What are the most common hreflang mistakes?

Common problems include wrong codes (like en-UK instead of en-GB), pointing to non-indexable pages, mixing canonicals to a different language page, and forgetting x-default when you have a global selector page.

Is this hreflang Tester safe to use?

Yes. It runs 100% client-side, so your checks run locally in your browser and are not uploaded to a server.

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The Hreflang Tester — Validate International SEO Tags Online 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.

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