European football's governing body said in a statement that more than 100 criteria, from stadiums and accommodation to legal matters, would be examined before the host nation is chosen in Geneva on May 28.
Sweden and Norway also put forward a joint candidature but withdrew in December after their governments said they would not be providing the money needed for investment in stadiums.
"Today marks a very important milestone in the bidding procedure, as it finalises the period of hard work and enormous commitment by each bidder," said UEFA's national teams competitions committee chairman Gilberto Madail.
"For the final tournament, hundreds of thousands of people visit the host country in order to watch matches and celebrate together," he added.
"On television, millions of people worldwide follow each match. Not only does this have a positive impact on the tourist industry, and thus on the economy of the country as a whole, it also supports the social aspect of football by bringing people together."
