Free tools

Free Hreflang Generator & Validator

Build hreflang link tags from locale-url pairs and catch duplicate locale, invalid code, or missing x-default issues.

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Tool 01

Hreflang Generator + Validator

Generate locale alternate tags and validate multilingual URL mappings for SEO.

Hreflang Tag Generator + Validator

Add locale to URL mappings and generate valid hreflang tags for international SEO.

Locale mappings (locale, url)

Generated tags

<link rel="alternate" hreflang="en-US" href="https://brandarmor.ai/en/features" />
<link rel="alternate" hreflang="en-GB" href="https://brandarmor.ai/en-gb/features" />
<link rel="alternate" hreflang="de-DE" href="https://brandarmor.ai/de/features" />
<link rel="alternate" hreflang="x-default" href="https://brandarmor.ai/features" />

Validation output

{
  "entries": [
    {
      "locale": "en-US",
      "url": "https://brandarmor.ai/en/features",
      "line": 1
    },
    {
      "locale": "en-GB",
      "url": "https://brandarmor.ai/en-gb/features",
      "line": 2
    },
    {
      "locale": "de-DE",
      "url": "https://brandarmor.ai/de/features",
      "line": 3
    },
    {
      "locale": "x-default",
      "url": "https://brandarmor.ai/features",
      "line": 4
    }
  ],
  "errors": [],
  "warnings": []
}

How it works

Hreflang Tag Generator + Validator: methodology and worked example

How this tool computes its result

Parses input lines in "locale, url" format or whitespace-separated format, validates each locale against the LOCALE_REGEX (/^[a-z]{2,3}(?:-[A-Z]{2})?$/) or the special value "x-default". Validates each URL with the URL constructor, catching malformed URLs. After parsing, checks for duplicate locales and duplicate URLs across all entries (warnings only, not blocking). If entries exist but no "x-default" is present, appends a warning. Generates HTML link tags in the format `<link rel="alternate" hreflang="LOCALE" href="URL" />`.

Worked example

Pasting three lines: "en-US, https://example.com/en", "de-DE, https://example.de", "x-default, https://example.com". All locales pass regex validation, all URLs parse, no duplicates. Output is three link tags, and no warnings fire since x-default is present. Pasting duplicate lines "en-US, ..." twice triggers warning "Duplicate locale detected: en-US (line X)."

When not to use this tool

This validates syntax and generates tags - it does not crawl your site to verify the URLs actually exist, that they share identical content (only with language/region variations), or that you've covered all the locale variants users actually visit from; it is purely a generation and structural validation tool.

Common mistakes

- Omitting x-default and not noticing the warning that x-default is missing - the tool generates tags correctly without it, but x-default is recommended as a fallback for users whose language doesn't match any specified hreflang alternative.
- Using an invalid locale code like "en_us" (underscore) instead of "en-US" (hyphen) - the regex requires hyphen-separated country codes; "en_us" is rejected as an error, not a warning.
- Pasting URLs with different schemes (http vs https) for the same locale - the parser treats "http://..." and "https://..." as different URLs, so the tool will not flag them as duplicates even though they point to the same page, potentially creating redundant hreflang entries.

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