Generate your hreflang tags
Create your hreflang link-attribute markup for your multi-language website while keeping the bi-directional nature of the links in mind. All equal content needs to be interlinked or Google may consider the markup broken.
Domain/URL Language Region (optional) x-default

The hreflang-guide for international SEO

In this guide we will show you how to correctly handle multi-language websites when it comes to Google. Avoid duplicate content and learn how to use the hreflang link-attribute.

To the hreflang-guide

How and where do I have to implement the hreflang-markup?

Google advises on using the hreflang-markup for the following scenarios:

Example:
<link rel="alternate" hreflang="de-AT" href="http://www.domain.de/at/" />
The language for this document is German (de) and is designated for the Region of Austria (AT). Thus, the content on www.domain.de/at/ is marked for German speaking users in Autria.

The language (de) needs to use the ISP 639-1 format. The regional-code (-AT) is optional and has to use the ISO 3166-1 Alpha 2 format.

The ISO-code ist not case-sensitive. Google will also accept lower case mentions of the optional regional-codes. The hreflang link-attribute markup will still be valid.

Keeping with the conventions, however, by writing the ISP-code for the language in lower-case and the optional regional ISO-code in upper-case is prefered.

What is the correct way of using the hreflang-markup?

When you use the hreflang-markup it is important to keep the bi-directional nature of the links in mind. This means that all equal content needs to be linked between each other. If the hreflang-markup is set up in "one direction" you will have broken the structure and Google will consider the markup invalid.
Example: Every piece of content is referencing the other pieces of content, respectively (bidirectional links).

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