I want to watch Bleach, 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?
The following episodes are anime-original content which you should skip if you aren't interested in filler. Some of the other episodes include original elements or reference events from filler episodes, but these do not impact the story in the long run so you can safely ignore them. The ones based on manga omake are noted as such.
Compactly, the fillers are: 33, 50, 64-109, 128-137, 147-149, 168-189, 204-205, 213-214, 227-266, 287, 298-299, 303-305, 311-342, 355. In more detail:
The series ends with episode 366, at which point you can pick up from manga chapter 480 if you so choose.
The sources for this are scattered across a number of sites, but of particular note are Bleach Wiki, Wikipedia's list of Bleach episodes, and this MAL forum post. However, all had at least some errors so I've had to check on various other websites as well.
There are several sources online that show which episodes are filler and which are canonical. Here is a link to one that I know for sure covers all of Bleach, they also have other anime as well.
http://www.animefillerlist.com/shows/bleach
Following are the filler episode numbers that you need to skip:-
33, 50, 64-108, 128-137, 147-149, 168-189, 204-205, 213-214, 227-265, 287, 298-299, 303-305, 311-341, 355
List of filler episodes, by arc:
