hreflang
hreflang tells Google which language and region a page targets. Incorrectly implemented hreflang leads to the wrong language page appearing in search results and duplicate content issues.
Features
- Language-region tagging in lang-REGION format
- x-default fallback page definition
- Reciprocal confirmation
- Next.js generateMetadata integration
- Validation with Screaming Frog
- Canonical consistency check
Use Cases
- Multilingual corporate websites
- E-commerce sites targeting different regions
- International SaaS products
- Multilingual content platforms
Deep Dive
What Is hreflang and Why Is It Critical?
hreflang is an HTML link attribute introduced by Google in 2011 to communicate content relationships on multilingual or multi-regional websites to search engines. It specifies which language and geographic region a page targets in lang-REGION format (e.g. tr-TR, en-US) and links all alternative language versions to each other.
Incorrect or incomplete hreflang implementation can result in: a Turkish page being shown to a user searching for English content; multiple language versions being detected as duplicate content, causing ranking drops; and weakened regional targeting signals.
hreflang Implementation at Detartech
In Next.js-based projects, we automatically add hreflang tags to each page's <head> section using the generateMetadata API. We use the x-default tag to define a fallback page for users whose language preference can't be determined.
During validation, we use Screaming Frog and the Google Search Console International Targeting report together. Key things we pay attention to: reciprocal confirmation (every hreflang pair must include a two-way link), canonical consistency (hreflang and canonical tags must not conflict), and absolute URL usage (absolute URLs instead of relative paths).
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