Hreflang on multiple domains

dummy imageby Lisa Dunn (142), 2 weeks ago Search engine optimization Google Domains

I need some help and guidance regarding Hreflang tag.

We are working on a website, say We are planning to launch the same website in the german language with different domain - The content should remain the same on the .de website.

We don't want to get into the Google penalty for duplicate content. How can I use hreflang tag on both of the websites?

I am confused using the hreflang tag on both websites. Should I need to add both tags on two domains?

I'd appreciate your thoughts. Thanks guys

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