Free, privacy-first
Last updated:
Audit hreflang clusters for reciprocity, self-references, x-default coverage, and URL quality before search engines route users to the wrong locale.
What this tool helps you answer
Use this tool when you want to confirm that hreflang annotations between language and regional versions of a page are structurally correct before they affect how search engines route international traffic.
The compliance score combines URL validity, hreflang syntax, reciprocity coverage, and x-default presence. A score below 100% means at least one structural issue needs to be resolved.
Compliance score combines URL validity, hreflang syntax, reciprocity, and coverage checksNext step
Audit hreflang clusters for reciprocity, self-references, x-default coverage, and URL quality before search engines route users to the wrong locale.
Editorial review
This page combines the live tool, input guidance, worked examples, and operating limits so Hreflang Checker stays useful even before users interact with the calculator.
Reviewed by Klartext Tools against the current Hreflang Checker workflow on 2026-03-02.
Last updated:
Use with judgment
Page scope
An English and German pair where each page annotates the other and includes a self-reference.
A clean two-language cluster with full reciprocity and self-references on both sides.
Switch 'Require x-default' to Yes after loading to see how the score changes when x-default is missing.
A UK, US, and default setup where one return annotation is missing: a common source of hreflang errors.
The checker flags the missing reciprocal annotation and scores the cluster below full compliance.
Fix the missing return annotation in the input to see the score recover to full compliance.
Prepare your hreflang mappings in delimited rows (CSV format: source URL, language tag, alternate URL) or paste the raw HTML alternate link elements directly.
Choose the input mode: delimited rows for a spreadsheet export, or HTML for a copied page head block.
Paste your hreflang mappings into the input area.
Set the expected host if you want to catch URLs that drift to a different domain.
Enable or disable the x-default requirement depending on whether your site uses a language selector destination.
Run the checker and review the compliance score, any missing reciprocal annotations, broken language codes, and self-reference gaps.
Load a minimal two-language setup or a more complex cluster with x-default to see how the checker evaluates reciprocity and coverage.
An English and German pair where each page annotates the other and includes a self-reference.
Sample inputs
Sample outcome: A clean two-language cluster with full reciprocity and self-references on both sides.
Switch 'Require x-default' to Yes after loading to see how the score changes when x-default is missing.
A UK, US, and default setup where one return annotation is missing: a common source of hreflang errors.
Sample inputs
Sample outcome: The checker flags the missing reciprocal annotation and scores the cluster below full compliance.
Fix the missing return annotation in the input to see the score recover to full compliance.
Hreflang errors are invisible in day-to-day site operation and only surface when search engines start serving the wrong language or regional version of a page. A missing x-default tag, mismatched ISO language codes, broken return annotations, or inconsistent URL formats between hreflang and canonical tags can all cause international traffic to land on the wrong page. This checker validates the full annotation set from a URL so you can fix structural issues before they affect regional ranking performance: rather than diagnosing them from Search Console anomalies weeks after the damage is done.
Hreflang errors are expensive because they waste localization work after launch. A multilingual release can look structurally complete and still fail on language targeting if reciprocal links, URL mapping, or page availability are not checked before publishing.
Most launch robots mistakes are avoidable. The problem is not that robots.txt is hard. The problem is that teams review it too late, test too little, or confuse a few working paths with a safe crawl policy.
These tools overlap, but they answer different launch questions. Robots.txt Auditor is better when you need to inspect the whole file as a policy document. Robots.txt Tester is better when you need a fast yes or no answer for a specific URL and user agent.
Small teams often reach a decision point before launch: are free browser-based tools enough, or does this release justify a paid SEO suite? The honest answer depends less on ideology and more on scale, accountability, and how much risk is packed into the release window.
Solo operators and individual publishers do not need agency-grade QA. They need a short, repeatable pass they will actually run before hitting publish. The most common small-site launch failure is not a wrong method. It is skipping the check entirely because no process forces it. This shortlist covers the browser-based tools that remove the highest-risk mistakes in the least amount of time for sites built and shipped by one or two people.
Agency launch QA is different from solo-site QA because the handoff risk is higher. A tool stack has to catch issues clearly enough that the team can explain them to clients, developers, and content owners without creating another debugging loop.
Technical website utility tools for robots.txt, hreflang, sitemap validation, crawl checks, and performance diagnostics.
Confirm crawlers can access the international pages before hreflang annotations matter.
Verify that your international URLs appear correctly in the sitemap.
Model how performance scores differ across device and network profiles for international audiences.
If the job spills into another category, these tools help with the next step.
Model long-term growth from starting capital, recurring contributions, and inflation before you commit to a savings plan.
Open toolProject how a starting balance and regular monthly contributions grow with compound interest over any time horizon.
Open toolProject your retirement savings balance from a current portfolio, monthly contributions, expected return, and inflation rate.
Open toolSolve the equation and interpret the parabola in one run.
Open tool