Although most of the tourists apply for a visa on arrival, you can apply for the Nepal visa online in advance, as well. You can apply for the Nepal visa at most 15 days ahead of arrival in Nepal. The things required are the address of the hotel, a recent digital version of a passport-sized photo, and the filled application form online.
Once you complete the submission process online, you can print out the confirmation receipt. You can display it to the Immigration officer upon your arrival at the airport and pay the proper amount to get your visa.
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