Blender has a lovely system for creating new shortcuts. Can anyone advise me on the code for the "Mark seams" operation? Bonus points for the button-toggle (one button to mark/unmark).

  • $\begingroup$ Two buttons, but you have that on the toolshelf, 'shading/UV' tab. For the shortcut Ctrl+E then choose in the list $\endgroup$
    – lemon
    Feb 19, 2017 at 17:55
  • 1
    $\begingroup$ You may also assign your own buttons to these operations in the same manner as here: blender.stackexchange.com/questions/36894/… $\endgroup$
    – Paul Gonet
    Feb 19, 2017 at 17:57
  • $\begingroup$ Paul Gonet deserves a plus because he actually showed hot to create the shortcut (even by just pointing to the solution). U wana post an answer? $\endgroup$
    – cubrman
    Feb 19, 2017 at 18:29

4 Answers 4


Press Ctrl+E and choose "Mark Seam" or "Clear Seam" from the list. Then, in order to add a shortcut, you can do as explained here: How to assign a keyboard shortcut for a mesh selection mode?

  • $\begingroup$ Please aprove my edit to your answer. $\endgroup$
    – cubrman
    Feb 19, 2017 at 18:50
  • $\begingroup$ Btw, for anyone concerned, there indeed seems to be no way for a one-button solution. You would need separate buttons for mark and clear. $\endgroup$
    – cubrman
    Feb 19, 2017 at 18:55
  • $\begingroup$ You can also (now?) press ctrl + e then press m on your keyboard $\endgroup$
    – Nicofisi
    Sep 16, 2020 at 12:58

If you are ready to invest a bit more work (Like I did for my Spacemouse Pro), you can also create a Pie Menu with mark and unmark, so you just need to press a key and move the mouse.


Code you will need is:

pie.operator("mesh.mark_seam", text="Mark Seam", icon='EDGESEL')

pie.operator("mesh.mark_sharp", text="Clear Seam", icon='MESH_CUBE').clear=True

Instead of the sample code with pie.operator_enum...

To register it as an add-on to keep it permanent just use the code below on top of your script

bl_info = {
    "name": "Mark Seam Pie Manu",
    "description": "Edit mode Edge Menu",
    "author": "...",
    "version": (0, 1, 1),
    "blender": (2, 79, 0),
    "location": "3D View",
    "warning": "",
    "wiki_url": "",
    "category": "Pie Menu"

If i understood the question you want to add shortcut for mark seam

In Edit Mode -> Select the Edge and Press Ctrl+E

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and how over the mouse and press right click and select Change shortcut

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As soon as u click on change shortcut u get a pop-up press a key

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I have selected the dot button from left of the keyboard

Now open user preferences and click the save user settings so that next time when you open blender mark seam setting will not disappear.

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  • $\begingroup$ If you copy the entrance at the userpreferences in input/3DView/Mesh you can add even more than one shortcut for the same action (as i recently learned here). This solution is the most simple one you could get! $\endgroup$
    – M. Matz
    May 31, 2018 at 15:45

In addition to the other answers. what i do is use CTRL + E then mark seam on one edge then for the rest i use SHIFT + R which repeats the last actions. So if you do anything other than selecting the edges like say add another edge loop you need to mark one seam again and then use shift + R to repeat. hope this helps someone, i know this is an old question.


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