There are some websites where reading comics is legal because the authors purposely allowed them to be read for free. But if you are downloading and reading from unofficial websites, then that is obviously illegal.
Where can I read comics legally?
These websites will let you read digital copies of popular and unique comic books for free.Marvels Official Site. Personally, I am a Marvel fan. DC Kids. Read DC. ComiXology. DriveThruComics. Amazon Kindle Store. Digital Comic Museum. Comic Book Plus. •6 Aug 2019
Can I read Marvel comics online?
Marvel is the only one of the big two superhero publishers with their online subscription service. With over 20,000 digital comics to read, Marvel Unlimited offers one of the largest libraries online. Subscribers can even save up to 12 comics on their mobile device for offline reading.