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I use a free tool called Plagiarism-Checker (https://www.plagiarism-checker.me/). It's pretty basic, but it does the job!

Without any indicators that Google 'do' think the links are spammy, I wouldn't worry about this too much. If you start to notice performance issues which you can isolate to these footer links, then I'd no-follow them right away Usually site-wide links are only an issue between different domains, and even then - only if it's not a multi-domain site. A multi-domain site is usually where you have exactly the same site with linguistic differences, spread across multiple domains (so instead of having site.com/fr/ and site.com/en/, you have site.fr and site.co.uk). As long as the templates are highly, highly similar and Google begins linking the 'brand-entity' across those sites, there shouldn't be a problem Lot's of sitewide links placed in footers across the web (cross-domain) are paid for links to manipulate SEO rankings. Those are bad. If your links are 'editorial' in nature (e.g: the site owner or editor decided they were required for user benefit) then I wouldn't be so concerned. There's always the chance Google's algorithm could get it wrong, and you could eventually have a problem What you need to decide is, would you rather have some small performance issues now (by removing the links or no-following them) and prevent any further 'possible' action in the future? Or would you rather take a small risk, and keep your results solid. No one 100% knows how Google's algorithm(s) work (not even Googlers). As such, there are elements of chance at play here and only you can decide what you are happy with: A) Undo or no-follow the links now for a high chance of mild devaluation now and some affected results, but it will almost 100% stop any site-wide linking penalty (which could wipe out all results) from occurring. The damage of that would be devastating, but the chance of it occurring in the first place is low B) Leave the links as they are. Experience no mild devaluations or performance issues at all, for now. But possibly in the future, you get struck with a penalty and lose everything. The chances of that seem very low, but if it does happen... ouch Sometimes both your choices are less than ideal. But you still have to choose! If it were me, I think (with the information which you have supplied thusfar) I'd leave it alone for now (but watch performance like a hawk)