Tell me about proxy verification online?

How can I check proxy servers online? I am interested to know how to do it for free and what parameters such as proxy type, country, speed and anonymity level can be checked when selecting a proxy server

Sure thing! You can hit up some free tools on a bunch of websites to check if the proxy you're eyeing is the real deal. They'll tell you if it's smooth and fast enough for your gig and spill the beans on which country it's repping and how low-key it keeps things. Plus, if you wanna dive deeper, peep this link for more on proxy checker