Optimization expert suggesting we add Canonical tag to every page on site

[CitimarineMoz]

Hi guys,

We're currently launching a new page, and we have an optimization and technical SEO expert (highly rated on Upwork, very intelligent, has solved complicated issues in the past and improved our Core Web Vitals greatly) suggesting we put canonical tags on every page of site, pointing to itself (other than the case of where canonicals should point to other page, we have those listed separately.

Do you guys see a benefit to this? Could it harm us? He says large retailers do this, couldn't quite glean the benefit from it though. Current site ranks well and isn't set up like this.

Any insight would be much appreciated!

Thanks!

[Fabian001]

@CitimarineMoz self-referencing canonicals as you described are an additional signal to Google to state that the page is the main variant and thus should be used on the SERP. Where no canonical tag is stated, there is a possibility where if content is similar, Google might select another page as the "canonical". As such, your page would not be shown on the SERP.

In your case, would say that implementing self referencing canonicals is a form of insurance/good to have at this time.