Freddy Milton was born in Viborg, in Jutland, Denmark. His first comics work was the realistic police strip 'Zenit', that he made with his brother Ingo for newspaper Jyllandsposten in 1972. Milton's real career took of in 1974, when he worked for the Swedish publisher Semic Press. He restored old newspaper comics and drew the Sherlock Holmes parody 'Sheerluck Homes' for Seriemagasinet. Most of his work of the time appeared in his own fanzine Sejd however, which he published between 1973 and 1979. In this fanzine, he created his famous 'Familien Gnuff' from 1974 to 1978. During this period, he also founded the fanzine Carl Barks & Co., in honour of the famous Duck artist.
In 1975, he teamed up with the Dutch artist Daan Jippes and began a collaboration with the Dutch publisher Oberon and the magazine Donald Duck, which lasted until 1982. Milton moved to Copenhagen in 1980, and besides his Disney work, he did translation jobs for Semic. For Interpresse, he made two albums with the Walter Lantz character 'Woody Woodpecker' ('Søren Spætte'), and later produced many Woodpecker stories for the Søren Spætte monthly. In this magazine, he also took on the 'Gnuff' series again. Several 'Woody Woodpecker' and 'Gnuff' albums have appeared since 1985.
Milton developed his own style of social criticism in his stories, especially in his adult comics 'Villiams Verden' (1982), 'Villiams andere Verden' (1984) and the album series 'Dekalog over Janteloven' (a comic adaptation of the Ten Commandments). In the second half of the 1980s, Milton produced successul "roll game books", like 'Hvem Myrdede Kock-Robin' ('Who Killed Kock Robin?'), 'Drøje Dage i Jobjunglen' ('Tough Days in the Job Jungle'), 'Jagten på den Vise Sten' ('The Hunt for Wise Sten') and 'Video eller Virkelighed?' ('Video or Reality?'). In addition, Milton cooperated with the LEGO company on a couple of albums, which were published in Germany as 'Burg Donnerstein'.
In 1995, Milton began the humourous Viking series 'Svend, Knud & Valdemar' in the monthly scouting magazine Glimt. In 1997 he returned to the funny animal style when he adapted K.H. Wieth's children's story 'Musebogen' into comic book format. Milton continued to draw Duck comics for Holland, without Jippes, throughout the 1980s, 1990s and 2000s, sometimes with his own scipts.