There are two types of addresses. 3 Addresses and M Addresses.
Legacy - 3 Addresses, same format as bitcoin addresses. They start with a 3
Segwit - M Addresses, litecoin only address format which start with an M.
Segwit addresses solve the problem that you can no longer send bitcoin to them by accident. Unfortunately, not all exchanges support the new format, so you have to run a conversion to
Can I have the same wallet with both a legacy and segwit address?
Yes you can. The process below just changes the format. Its the same address written in a different way.
How do I convert it?
Simply grab your litecoin address and put it into the the field on the site below.
Keep a record of both addresses and always use the M Address if you can, but keep the 3 address incase you need it for a transfer than doesn't support the M address format.