All perfect praise be to Allah the Lord of The Worlds. May His blessings and peace be upon our Prophet Mohammad and upon all his family and companions.
There are two types of dating websites for marriage:
First: Websites that adhere to the rules of Sharia and the moral code where the people in charge of the website exert their utmost effort to leave no room for individuals who are corrupt and have personal agendas. It is permissible to participate in these websites and benefit from them.
Second: Websites that don`t adhere to the rules of Sharia, don`t protect personal information, and those in charge of them are evil and dishonest. People should avoid such websites and it isn`t permissible to participate in them.
In all cases, we don`t favor resorting to such method for marriage as it involves a great deal of risk. And Allah The Almighty Knows Best.