I found https://nextdns.io easy to use with good free plan - 300,000 queries/month

I use AdGuard’s public DNS. Mostly because it’s free. https://adguard-dns.io/en/public-dns.html

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I love NextDNS, does everything I need it to.

I use Control D. They operate a few resolvers.

• p0.freedns.controld.com - filters nothing
• p1.freedns.controld.com - filters malware
• p2.freedns.controld.com - filters malware + ads
• p3.freedns.controld.com - filters malware, ads, and social media (obviously not fediverse stuff since there are so many). This is the one i use.

I would encourage you to find one that fits your needs at DNSCrypt, or Privacy Guides, or Privacy Raccoon. Which will provide some basic information about a DNS resolver, then you can do more research as you see fit.

As a heads-up, some will block ads for you and some won’t.

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Quad9 on my laptop. AdGuard on my phone.

On android, I use rethinkDNS. Its pretty configurable and open-source. On windows or linux, I use mullvad dns. They have 2 free DNS resolvers(unfiltered, adblock)