It’s mostly known for its anime streaming service, but it also boasts a decent selection of legally sourced manga titles. If you don’t find the manga you’re looking for on Viz Media, then you may find it on Crunchyroll.
The UI that you’re greeted with when you click on the website is not that great. The site pushes all the content to the middle of the page, leaving blank spaces on the sides. This makes the pages look a little weird, and you have to deal with smaller font as a result.
There is a feature called “Crunchyroll BETA” that you can only access if you sign in. This will give you the premium version of the UI and makes the site look much better — overall, a nicer way to read manga online on the site as compared to the default layout.