The idea to develop Final Fantasy XI as an online game was conceived by Hironobu Sakaguchi when establishing Square Pictures headquarters in Hawaii. Impressed by western MMORPGs that he discovered there, such as EverQuest, Sakaguchi convinced Square to begin the development of their own MMORPG and suggested that it be based on the Final Fantasy series.The team responsible for Chrono Cross was assigned to the development of Final Fantasy XI after the English localization of the former title.The game was the first developed under Square's new philosophy to develop for "all platforms and media".

Hiromichi Tanaka, the producer of the game,has stated Final Fantasy XI is heavily influenced by Final Fantasy III, especially in its battle and magic systems.According to Tanaka, Square put in Final Fantasy XI what they could not put in the first Final Fantasy titles due to technical limitations, thus making Final Fantasy XI the "most representative Final Fantasy of all the installments".The game was developed and ran on the Nvidia GeForce 4 Ti GPU, which the President of Square Yōichi Wada described as the most powerful graphics processor available at the time.The game cost two to three billion yen (~$17–25 million) to create along with the PlayOnline Network Service and was assumed to become profitable over a five year timespan.By creating a unified game world instead of different ones balkanized by language, development costs were cut 66%.

Since recurring monsters of the series are known by different names in the Japanese and English versions of the other installments, it was decided for Final Fantasy XI to use both Japanese and English names for different varieties of the same monsters.
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