This particular text version of Kalki Puran in Hindi is pdf format with Sanskrit verses and explanation in Hindi. Kalki Purana is dedicated to the Kalki Avatar of Vishnu. It is believed that Bhagvan Vishnu will appear as Kalki in future and start the destruction of the universe and make the universe read for next cycle of creation. The Purana explains about the birth of Kalki, the Adharma that flourishes on earth in various forms and what will happen to people who follow Dharma.
Link - Kalki Puran in pdf