The phrase "converted himself" is grammatically correct and is commonly used in written English.
It typically means that someone has changed or transformed themselves in some way. Here is an example sentence: "After facing numerous hardships, John finally converted himself into a confident and successful businessman."
He joked a little & then said he wouldn't think of converting anyone and had not intention of being converted himself.
The owner of the building was Tamir Sapir, a former cabdriver from Russia who had converted himself into a Manhattan real estate mogul.
Goneva drove through three to the shadow of the posts and beautifully swift hands from Manu Tuilagi, who had had a quiet match, sent Burns over for a try he converted himself.
Last summer, Mr. Buckley drove his cryogenic ice cream truck (a DHL truck he bought on Craigslist.org and converted himself) to the Burning Man festival in the Nevada desert, stocked with every flavoring he could think of.
By striking out on his own, Levy converted himself from a person who looked for solutions (to problems defined by his company or the complaining public) to a person who had to look for problems as well.
Harlequins edged ahead again with an Evans penalty before Slade was involved in a move that revolved around Elvis Taione battering through Evans – who was forced off in groggy pain – and finished with Steenson taking a pass brilliantly off the floor to score a try he converted himself.
While Zico converts himself into such a worldly coach, Romario is trying something completely different.
He selected as his thesis "The Bird Fauna of the West Sumatra Islands," and set about converting himself into a doctor.
Any fan of Mr. Lawrence's sitcom "Martin" knows about his skill in using transformative appliances to convert himself into another person with even fewer inhibitions than he displays as himself.
But if technology could provide more and more goods from fewer and fewer resources, it was conceivable that man could convert himself from an inherent failure, as Malthus had depicted him, into a success in his environment.
Instead of giving them terrible illnesses it of course turns them into Übermenschen of various sorts, though only Johnny's new abilities are an unmixed blessing: by shouting "Flame on!" he converts himself into a flying ball of fire.
