It depends. Some online comic reading platforms have legal licenses and it's fine to read there. But if it's pirated or unauthorized content, it's not legal.
In many cases, it's legal if you're accessing comics through legitimate subscription services or official websites. However, if you're using unapproved or illegal sources to read comics, that's against the law.
Whether it's legal to read comics online varies. Legitimate platforms that have obtained the necessary rights make it legal. But be cautious of random websites offering free comics as they might be infringing on copyrights, making it illegal to read from them.