Some valuable info.

If you're watching the One Piece anime.
I wrote down where each movie is placed and between what episodes you should watch them.
It took me ages.

Ep 1-18
One Piece: The Movie
Ep 19-61
Clockwork Island Adventure
Ep 62-91
Chopper's Kingdom on the Island of Strange Animals
Ep 92-135
Dead End Adventure
Curse Of The Sacred Sword
Ep 136-138
Baron Omatsuri and the Secret Island
Ep 139-206
The Giant Mechanical Soldier of Karakuri Castle
Ep 207-425
Ep 426-429 (Then One Piece Film: Strong World)
Ep 430- (Ongoing)