I want to watch One Piece, but the anime has a lot of filler content not in the manga. I’d rather not watch the filler content and only watch the episodes which are directly related to the plot. To be clear, I’m defining a filler episode as one which is not based on any story in the manga or based on extra manga chapters which have nothing to do with the overarching story.
Which episodes are filler?
This question is taken from this question. I was curious about this myself after completing the One Piece manga, but to keep uniformity between similar questions, I took the same wording as Logan-M had used in his question about Bleach filler.
There seems to be alot less filler in One Piece than in Naruto or Bleach. That being said, there have been 12 filler arcs:
Warship Island Arc (episodes 54-61)
Post Alabasta Arc (131-135)
Goat Island (136-138)
Ruluka Island (139-143)
G-8 (196-206)
Ocean’s Dream (220-224)
Foxy Returns (225-226)
Lovely Land (326-335)
Spa Island (382-384)
Little East Blue (426-429)
Z’s Ambition (575-578)
Ceasar Retrieval (626-628)
Episodes 50, 99, 102, 213, 280-283, 291, 292, 303, 317, 318, 336, 406, 407, 492, 499, 506, 542, 590 are also listed as filler on the wiki.
There are additional episodes that are part of main arc that spend time on (sometimes non-canon) details that aren’t significant in the manga. As this is subject to opinion and doesn’t take an entire episode, I don’t have a simple list for this.