Why this matters
Broken hreflang annotations can cause geo-language cannibalization and wrong landing page selection.
Best practices
- Ensure every alternate mapping has a reciprocal reference.
- Include self-referencing hreflang annotations per source URL.
- Add x-default for language selector or fallback destinations.
Use Cases
- Estimate materials before purchasing to reduce project waste.
- Compare scenarios on-site and adjust quantities in real time.
- Create clearer project plans with transparent calculation logic.
Frequently Asked Questions
Can I paste raw <link> tags?
Yes. Switch input mode to HTML and paste alternate link elements. Review assumptions and warnings together with the final value before making decisions.
Does it validate full BCP 47 language tags?
It validates a practical subset for common language-region patterns and x-default. Review assumptions and warnings together with the final value before making decisions.
How reliable are the calculated results in this tool? (Hreflang Checker)
This tool applies deterministic formulas to the exact inputs you provide, so the same input always returns the same output. Accuracy depends on input quality and on how closely real-world conditions match the model assumptions shown below the result. Use the output as structured decision support, then validate with project-specific constraints when stakes are high.
Are my inputs saved or sent to a server? (Hreflang Checker)
Calculations run locally in your browser session for immediate feedback, and no manual form submission is required. If you use export actions, files are generated and downloaded on your device. For sensitive workflows, you can still clear the form and browser data after use.
What input mistakes most often lead to misleading results? (Hreflang Checker)
The most common issues are unit mismatches, unrealistic defaults left unchanged, and incomplete boundary conditions. Double-check decimal separators, percentages versus absolute values, and the selected mode or profile before calculating. If results look unexpected, run a second scenario with conservative values to verify sensitivity.
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