Have I Been Pwned? is just about the best and the most transparent and free to use. It takes data from publicly leaked breaches thats been illegally obtained and posted on the web. It covers recent hacks of LinkedIn, MySpace, Tumblr, Dropbox and more. It’s worth spending a few minutes to run your credentials through the site to see if youve got anything to worry about. If you find that you have indeed been pwned, check the relevant account for suspicious activity and change your password.”]
Source: https://gizmodo.com/the-quickest-way-to-find-out-if-youve-been-hacked-1786777980