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Is there a quick way to delete all materials in the scene? I have a scene containing 20+ materials and all linked to objects. I'd like to remove all the materials from my blender file.

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Yes, you can. Easy way would be:

  1. Select all objects, keep one active, remove all materials on it by pressing the "-" button on the right-hand side of material slot list;
  2. Then, from the drop-down list (below it), choose Copy Material to Others. Save the file.

enter image description here

All unused material data will be removed after saving. You cannot see them anymore after reopening.

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  • $\begingroup$ I never knew such a thing ever existed. Found the button, done and gone. $\endgroup$ – ikel Feb 19 '14 at 4:53
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There's an addon Material Utils, which ships with Blender.

Enable it in the User Preferences > Addons, select all objects A, hit Q over 3D View and chose Remove Material Slots:

Material Utils Addon - Remove Material Slots

It currently works on the active object only, despite the tooltip stating it would work for multiple objects. Here's a scripted solution for all selected, editable (non-linked) objects:

import bpy

for ob in bpy.context.selected_editable_objects:
    ob.active_material_index = 0
    for i in range(len(ob.material_slots)):
        bpy.ops.object.material_slot_remove({'object': ob})
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    $\begingroup$ According to the tooltip: "Remove all material slots from active objects", so a Copy Material to Others operation is still needed. Btw, you are supposed to suggest a coding way, I bet. :P $\endgroup$ – Leon Cheung Feb 19 '14 at 8:05
  • $\begingroup$ Interesting, it says objects, but seems to work on the active object only. I should either fix the tooltip or add an option to chose what to delete (slots of active object, selected objects, scene objects, all). $\endgroup$ – CoDEmanX Feb 19 '14 at 8:13
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    $\begingroup$ Yeah, This is the CoDEmanX I know of. XD $\endgroup$ – Leon Cheung Feb 19 '14 at 8:23
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    $\begingroup$ Added a scripted solution to really remove all slots of all selected objects :) $\endgroup$ – CoDEmanX Feb 19 '14 at 8:27
  • $\begingroup$ I'm working on the Material Utils addon and it looks like it currently fails for a lot of scenarios? I wonder how slot cleanup should behave, I could let it remove all empty slots (but they can actually be assigned without material!), or only slots with materials not used by the object, or a mix of both... Won't work for text objects however, they don't seem to expose the materials :( $\endgroup$ – CoDEmanX Feb 23 '14 at 1:39
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to delete all materials: 

import bpy
for material in bpy.data.materials:
    material.user_clear()
    bpy.data.materials.remove(material)
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    $\begingroup$ You don't need ; in python tho $\endgroup$ – Sibbs Gambling Jan 15 '18 at 13:19
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just had to solve this problem too. The other answers here didnt work for me. My solution:

  1. Select all of the objects you want to remove materials from.
  2. In Object Mode, Join them (menu: Object/Join or shortcut: ctrl + 'j').
  3. Remove the material(s) in the materials panel by pressing the '-' button.
  4. In Edit Mode, select all ('a'), press 'p' and separate (by loose parts in my case) to get your individual objects back.
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    $\begingroup$ I'd use this if and only if none of the original objects had loose parts, or shared the same origin, or had meaningful names (mesh or object). $\endgroup$ – batFINGER Oct 21 '17 at 12:04
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    $\begingroup$ This might not work as expected for mesh objects containing several meshes, like e.g. monkey. After your procedure there will be monkey and 2 eyes objects. Answers shown here still work for this situation $\endgroup$ – Mr Zak Oct 21 '17 at 12:28
  • $\begingroup$ above critiques accepted :o) $\endgroup$ – tinyMind Oct 21 '17 at 17:30

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