There are several tools online where you can count the characters and words, but, there is one site which was unique from others which has the useful resources.
character count is an useful character counting tool which is the best one having the ability to count the characters inlcuding spaces or else without spaces. It also has the features like keyword density along with word, paragraph and sentence calculating.
character counter also do provide updates about social media platforms character count which will be an useful information these days as many people are on the social media platforms. Especially Twitter has a limited character count of 280 now and you can use sites like character count online before you make your tweets online as it shows the character count inlcuding spaces as well which will let you know your tweet's character count.