Shippuden often places filler in the middle of major battles. Notable skippable arcs include: (89-112) The Six-Tails Arc: (144-151) Power Arc: (290-295) High animation quality, but non-canon.
Explains Itachi’s past in more detail (technically adapted from light novels). To help you plan your marathon, would you like: A printable checklist of the episodes? A list of the canon movies ? Breakdowns of specific filler arcs worth seeing?
These episodes contain mostly original content but include small pieces of important plot: 26, 97, 101-106 What to Skip naruto episodes canon
For fans who want to experience the main story without interruptions, focus on these specific episode blocks: Naruto Filler List: Episodes & Arcs You Can Skip - Yahoo
The famous quest to see what is under Kakashi’s mask. Shippuden often places filler in the middle of major battles
This makes up the final third of the show, though it is heavily interrupted by flashbacks. The "Filler Hell" of Shippuden
While skippable, some fans enjoy specific non-canon episodes for their humor or world-building: To help you plan your marathon, would you
The existence of filler creates a dichotomy in the viewing experience.