
Adding quality seals and certificates to a web page does not have a direct ranking effect for Google.
However, reputable seals can lead to more trust among users.
Markings as "Trusted Shop" or for the encrypted data transmission are common and should promote the trust of the users.
It must be distinguished between official seals, which are awarded only in conjunction with a rigorous examination, and invented awards, which are merely intended to give the impression of quality.
However, one should not forget the indirect effect of quality seals.
If users have more confidence in the site, they can increase the chance of conversion, lower bounce rate, more page views, and longer retention time.