"Dragon Ball GT" is not legally available for free online as of 2015, but many full episodes are available for viewing on Funimation.com's official page for the program. A Funimation subscription is required. Additionally, fans may purchase remastered DVD editions of the complete series.
Funimation.com's "Dragon Ball GT" page offers both season one and season two of the series, totalling 64 episodes. For each episode, Funimation has both the English subtitled and English voiceover dubbed versions of the episode. In addition to all the episodes, Funimation also has the "Dragon Ball GT" movie and the official promotional trailer for the full series.