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This question already has an answer here:

I applied the subdivision modifier a while ago. But Blender can't take it anymore I really need to undo it! I already start over a bit with the project but I really do not feel like making the wings all over again and the hair....can someone help me?

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marked as duplicate by PGmath, cegaton, Duarte Farrajota Ramos, David Jul 30 '17 at 21:28

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  • $\begingroup$ CTRL+Z is your friend. Always test to check performance issues before applying, especially with the subdivision surface modifier, as it can really mess up your mesh. As far as directly UNDOING it, I don't know. $\endgroup$ – FreemoX Jul 30 '17 at 11:53
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    $\begingroup$ see blender.stackexchange.com/questions/21082/… $\endgroup$ – m.ardito Jul 30 '17 at 12:27
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    $\begingroup$ Never apply modifiers or convert curves to meshes unless strictly necessary, if you do make it as late as possible, and always keep a safe copy of the original $\endgroup$ – Duarte Farrajota Ramos Jul 30 '17 at 13:29
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There is an option that could help you to "undo" an applied subdivision surface modifier, although the best options are already said in comments (ie: a real undo before closing the file or keeping an unapplied copy of the object):

enter image description here

here is how it works on a simple cube

enter image description here

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