#547 · Developer Tool

Hreflang Tag Generator

Generate alternate link elements from a locale-to-URL list. Each line pairs a BCP 47-style language tag with an absolute page URL, producing escaped, copy-ready hreflang markup in the same order. The generator normalizes language and region casing, rejects duplicates and invalid protocols, and can append one x-default target. It is suited to building a complete alternate cluster for an HTML head or reviewing locale routes before deployment.

Developer Input

Web metadata input
Ad space

How to use this developer tool

  1. Paste the requested source text or load a local file.
  2. Set any comparison values or processing options shown below the input.
  3. Select the primary action or press Ctrl/Cmd + Enter.
  4. Review the diagnostics, then copy or download the output.

What this developer tool does

The output is a set of HTML link elements with normalized hreflang values and safely escaped href attributes.

Language subtags become lowercase, two-letter region subtags become uppercase, and every URL must be absolute HTTP(S). Duplicate locales are rejected.

Every localized page should publish the same complete set, including a self-referencing alternate and reciprocal links.

Example

Input

en-US | https://example.com/en/
ko-KR | https://example.com/ko/
ja | https://example.com/ja/

Run the sample to see the exact report and metrics produced by the current implementation.

Use cases

  • Pre-deployment review of generated site files
  • Debugging crawler or link-preview configuration
  • Auditing metadata during a migration
  • Creating repeatable QA evidence for a release

Tips for reliable output

  • Paste the complete source when grouping or document context matters.
  • Use absolute public URLs unless the field explicitly accepts a path.
  • Retest after redirects, route rules, or locale mappings change.
  • Keep a deliberately invalid sample for regression checks.
  • Confirm the deployed result with the relevant external platform.

Processing details

Language subtags become lowercase, two-letter region subtags become uppercase, and every URL must be absolute HTTP(S). Duplicate locales are rejected. The parser runs entirely in the current browser tab and returns copy-ready text plus structured exports when useful.

Every localized page should publish the same complete set, including a self-referencing alternate and reciprocal links.

Frequently asked questions

Can I use this tool without uploading data?

Yes. Processing happens in your browser, and the page makes no request with the supplied input.

What happens when the input is malformed?

The Hreflang Tag Generator stops, displays an actionable error, and does not produce a misleading successful result.

Does the result guarantee search engine behavior?

No. The result checks the supplied markup or rules; crawlers and social platforms may apply additional policies and cached data.

Can I download the result?

Yes. Use Download for the primary output, or the CSV and JSON buttons when structured exports are available.

How should I test the result before deployment?

Run a representative valid sample and a deliberately invalid case, then verify the deployed public URL with the relevant crawler or platform tool.

Checks and output

AreaBehavior
InputProcessed locally
ErrorsReported without silent correction
ExportCopy, download, and structured data when available

Web Meta & Server Files

Inspect crawler directives, sitemap files, canonical URLs, localized alternates, and social metadata.

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