Guinness Pakru hails from Aymanam, Kerala in India. He is a BA graduate with economics and has a diploma in computer science. He started his career as a mimicry artist and later moved to films. He debuted through the children’s film Ambili Ammavan (The Moon) in 1984. He now also acts in TV serials. He married Gayatri Mohan in March 2006. They have a daughter.
Undapakru has made an entry into the Guinness Book of Records for being the shortest actor (2 ft 6 in (76 cm)) to play a character in a full-length film. He played the lead role in Albhutha Dweep, a Malayalam movie directed by Vinayan. The movie was later dubbed in Tamil.
The film Albutha Dweep starred him as dwarf prince Gajendra of the kingdom Vamanapuri on a fantasy island, where the men were cursed to be dwarfs and women were of normal height. Around 300 dwarfs acted in that film. Undapakru's accomplishment is cited on the 167th page of the 2008 edition of the Guinness Book of Records. Apart from this world record, he was also presented with a Kerala State Film Award and a special Tamil Nadu State Film Award for his performance in the film Dishyum in 2006.