Steps to Convert MBOX Emails into HTML Easily?

I have a large number of emails saved in an MBOX file from my old email client. Now I want to convert these emails into HTML format so that I can view them in a browser and share them easily. I tried some manual tricks but could not figure out a reliable method. Can someone guide me with simple steps or suggest any tool that can help me convert MBOX emails to HTML without losing formatting or attachments?