Q:

Which episodes of Fairy Tail are anime-exclusive? 

Up to episode 175, I know Fairy Tail has some episodes which are not in the manga. 
If I want to watch the series again but not the episodes that are anime-exclusive, which ones should I skip? 
This question is inspired by Which episodes of Bleach are fillers, I just decided to do the same for Fairy Tail

A:

These following episodes list the content which are only present in the anime of Fairy Tail, not in the manga.  
This is a list of episodes defined as anime exclusive in the Fairy Tail Wikia
Compactly, it gives episodes: 19, 69-72, 74-75, 125-150, 204-218, 221, 223-225
Galuna Island Arc

Episode 19 - Challenging! 

Daphne Arc

Episode 69 - Call of the Dragon
Episode 70 - Natsu Vs.  Gray!! 
Episode 71 - Friendship Will Overcome the Dead
Episode 72 - Fairy Tail Wizards
Episode 74 - Wendy's First Big Mission?! 
Episode 75 - The 24-Hours Endurance Road Race

Key of the Starry Sky Arc

Episodes 125-150 - This whole arc is anime exclusive

Eclipse Celestial Spirits Arc

Episodes 204-218 - Stake My Life on Hospitality - Believe
Episode 221 - The White Silver Labyrinth
Episode 223 - Kemokemo Arrived! 
Episode 224 - The Place You Came Before
Episode 225 - The Thunder Man

The series currently ends with Episode 235

