Hreflang Checker - International SEO Validator

Test & check hreflang tags instantly: validates return links, language codes, x-default & canonical for international SEO.

🌍 Hreflang Checker - Automatic International SEO Validator The most complete Chrome extension to check, test and validate hreflang tags on any page. It works as a hreflang tag checker, hreflang validator and hreflang tester all in one - automatically fetching every alternate-language URL, verifying reciprocal return links, and validating language codes, x-default, self-referencing and canonical consistency the moment you land on a page. No clicks needed. It even works on localhost and staging, so you can test your hreflang implementation before going live. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✨ WHAT MAKES THIS EXTENSION UNIQUE? 🤖 ZERO-CLICK, FULLY AUTOMATIC ANALYSIS The extension works automatically in the background: • Reads every hreflang tag from the page on load • Fetches each alternate URL and checks for the reciprocal return link • Validates language and region codes against ISO standards • Detects canonical and self-referencing issues instantly • Updates the toolbar icon color based on status You don't need to click anything - just look at your toolbar icon! 🧪 IDEAL FOR LOCAL TESTING (LOCALHOST & STAGING) Validate your hreflang implementation BEFORE it goes live: • Works on localhost, staging and pre-production environments • Catch missing return links and invalid codes during development • No need to deploy and wait for Search Console to flag errors • Reads JavaScript-rendered hreflang tags, perfect for local dev servers Test your international SEO setup locally and ship it already correct. 🎨 SMART ICON COLOR INDICATOR Our extension icon changes color automatically to alert you about hreflang issues: • 🔵 Blue: Default state - all reciprocal links OK, no errors • 🟡 Orange: WARNING - non-critical issues (e.g. missing x-default, canonical mismatch) • 🔴 Red: ERROR - missing return links, invalid language codes or broken hreflang This visual feedback lets you instantly know the hreflang status of any page you visit without even opening the extension! ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ⚡ HOW THE AUTOMATIC CHECK WORKS 1️⃣ You navigate to any webpage (live, staging or localhost) 2️⃣ Extension AUTOMATICALLY: • Reads all hreflang annotations on the page • Fetches every alternate-language URL declared • Verifies each one links back (reciprocal return tag) • Validates language/region codes and x-default • Compares hreflang against the canonical URL 3️⃣ Icon color updates instantly in your toolbar 4️⃣ Click to see the full breakdown (optional) No manual triggers. No waiting. Just instant, automatic hreflang diagnostics. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🛠️ COMPLETE FEATURE LIST 🔗 RETURN LINK (RECIPROCAL) CHECKER • Fetches every alternate URL declared in your hreflang tags • Verifies each page links back to the current one • Flags the #1 hreflang mistake: missing return tags ("no return tags") • Catches silent errors that Google ignores without warning 🌐 LANGUAGE & REGION CODE VALIDATOR • Validates every code against ISO 639-1 (language) and ISO 3166-1 (region) • Detects invalid codes like "eng", "en-UK" or reversed "US-en" • Suggests the exact correct code (e.g. "en-UK" → "en-GB") • Validates x-default and script subtags ♻️ SELF-REFERENCING TAG CHECKER • Confirms each page includes a hreflang tag pointing to itself • Flags non-self-referential clusters that break hreflang 🔀 CANONICAL CONSISTENCY CHECKER • Detects when hreflang points to a page whose canonical differs • Validates hreflang on parameterized URLs against the canonical version • Avoids false failures from harmless URL parameters 🔁 SMART REDIRECT DETECTION • Distinguishes harmless redirects (http→https, www normalization) • Flags problematic geo-IP redirects • Warnings, not false errors ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💡 WHY HREFLANG CHECKING MATTERS ❌ THE PROBLEM: • Most hreflang errors are completely invisible • Google silently ignores broken tags and shows the wrong-language page • No warning, no error in Search Console - just lost international traffic • Missing return links are the most common and most silent mistake ✅ OUR SOLUTION: • Always-on background monitoring of every page • Works on localhost and staging - test before you deploy • Instant visual feedback via icon color • Checks the whole language cluster in seconds • Built around Google's official hreflang guidelines • Perfect for auditing your own site or competitors ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 👥 WHO BENEFITS FROM THIS EXTENSION? 🎯 SEO PROFESSIONALS • Audit hreflang implementation during international SEO reviews • Instantly spot missing return links and invalid codes • Quick-check client sites without manual crawling 💻 WEB DEVELOPERS • Test hreflang on localhost and staging before going live • Catch hreflang misconfigurations during development • Works with JavaScript-rendered pages and local dev servers 📢 CONTENT & LOCALIZATION TEAMS • Make sure each market shows the right language version • Simple color system: blue = good, red = problem • No technical knowledge required 🏢 AGENCIES & QA TEAMS • Monitor hreflang health across many sites • Visual confirmation without extra tools • Faster international SEO QA on staging and production ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🚀 GETTING STARTED 1️⃣ Install the extension 2️⃣ Pin it to your toolbar for visibility 3️⃣ Browse normally - hreflang analysis happens automatically! 4️⃣ Watch the icon color for instant status 5️⃣ Click for the detailed breakdown when needed That's it! No configuration, no setup, no manual triggers. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔄 SPA & DYNAMIC SITE SUPPORT Our extension automatically handles modern websites: • Detects URL changes in Single Page Applications • Re-analyzes on navigation without page reload • Reads hreflang tags rendered by JavaScript, not just static HTML Works perfectly with React, Vue, Angular, Next.js and any JavaScript framework. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🔒 PRIVACY & PERMISSIONS This extension: • Does NOT collect any personal data • Does NOT track your browsing history • Does NOT send data to external servers • Only reads hreflang tags and fetches the alternate URLs declared on the page you audit • All processing happens locally in your browser ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ❓ FREQUENTLY ASKED QUESTIONS (FAQs) Q: Do I need to click something to run the check? A: No! Analysis runs automatically on every page load. Q: Does it work on localhost? A: Yes! It's ideal for testing your hreflang setup on local and staging environments before deploying. Q: What does the "missing return link" error mean? A: An alternate page doesn't link back to your page. Google then ignores the whole pair. It's the most common hreflang mistake - and completely silent. Q: It runs on a URL with parameters - will it fail? A: No. The extension validates against the canonical URL, so harmless parameters don't cause false failures. Q: Will it slow down my browsing? A: No. All checks run asynchronously in the background. Q: Does it work on SPAs (Single Page Applications)? A: Yes! It monitors URL changes and re-analyzes automatically. Q: Is it really free? A: 100% free, no premium version, no hidden costs. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🏷️ REAL USE CASES 📌 Auditing an international site When you run an international SEO review, you need to check the hreflang tags across every language version. Open each page and the extension acts as a hreflang validator in the background, confirming the alternate links are reciprocal and the language codes follow the ISO standard. What used to require a full crawl becomes a quick visual check. 📌 Testing before you deploy Developers can test hreflang on localhost and staging long before a page reaches production. Instead of shipping first and waiting for Search Console to surface errors, you check the tags on your local dev server and fix any missing return links or invalid codes while the feature is still in review. 📌 Catching the "missing return link" problem The most common hreflang mistake is a page that declares an alternate URL which never links back. Google silently ignores the pair, and nothing shows up as an error. The extension works as a reciprocal return-tag checker, fetching each alternate URL and flagging the ones that don't point back. 📌 Validating language and region codes Typos like "en-UK" or a reversed "US-en" quietly break your targeting. The built-in language code validator compares each value against ISO 639-1 and ISO 3166-1 and suggests the correct code, so your multilingual SEO setup targets the right markets. 📌 Checking x-default, self-referencing and canonical consistency A complete hreflang implementation needs an x-default, a self-referencing tag on every page, and hreflang values that agree with the canonical URL. The extension checks all three at once and warns you when a page's hreflang and canonical disagree. 📌 QA across many client sites Agencies and QA teams can browse a list of pages and rely on the toolbar icon color for an at-a-glance hreflang audit — no separate tool to open, no manual triggers, just instant feedback as you move from page to page. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 💌 SUPPORT & FEEDBACK Developed with ❤️ by Fever's SEO Team (business.feverup.com) Have suggestions or found a bug? We'd love to hear from you! Contact: mariopalencia88help@gmail.com If you find this extension useful, please consider leaving a ⭐⭐⭐⭐⭐ review!