Litecoin 3 ↔ M
Litecoin script addresses used the same 3… form as Bitcoin until Litecoin introduced M…. Both encode the same script hash; only the version byte differs (0x05 and 0x32).
What cannot be converted
An ltc1… address is native SegWit, a different address type. It has no 3… or M… spelling, and no tool can produce one. An L… address is P2PKH and also has no 3… or M… form.
A 3… string is also a valid Bitcoin address. Converting it only makes sense when it was given as a Litecoin address.
A valid format does not mean the address belongs to the right person. It only means the address is well-formed. Compare the whole address with the source and send a small test amount first.
FAQ
Is a Litecoin 3 address the same as the M address?
Yes, when it is the same script hash: the converter shows the pair. Coins sent to either reach the same script.
Can I convert ltc1 to M?
No. ltc1 is a different address type, not another spelling.