Is ONE PIECE episode 547 filler?
Canon No, episode 547 of ONE PIECE is canon.
#547
Back to the Present! Hordy Makes a Move!
再び現在へ！動き出すホーディ
Aired 13 May 2012
Mochibayo compiled this list from MyAnimeList's labels, because MyAnimeList's episode data is not reaching us at the moment.