Title: Setting the thumbnail size
Last modified: October 23, 2016

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# Setting the thumbnail size

 *  Resolved [hardy2408](https://wordpress.org/support/users/hardy2408/)
 * (@hardy2408)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/setting-the-thumbnail-size/)
 * Hi,
 * I’m trying to set the thumbnail image size different to 150x150px.
 * So far I changed it in the “setting/media” to 100×100
    and I also tried to set
   it in the functions.php file of my twentytwelve theme with set_post_thumbnail_size(
   100, 100, true );
 * without success.
 * Where/how can I change it?
 * Thanks for your help!
 *  Gerhard

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Author [David Aguilera](https://wordpress.org/support/users/davilera/)
 * (@davilera)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/setting-the-thumbnail-size/#post-8409127)
 * Hi!
 * As far as I know, you did what you’re supposed to. There are two things that 
   you should know, though:
    1. New thumbnail sizes will be applied to the images you upload to the media library
       from now on. The thumbnails of the images you uploaded before this update will
       still be 150x150px. Use a plugin such as Regenerate Thumbnails to, well, regenerate
       the thumbnails
    2. Our plugin doesn’t actually generate thumbnails from external images. These 
       images are stored in an external server and we can’t scale them; we can simply
       link them and hope for the best (we actually apply some tricks to simulate scales
       and crops… but that doesn’t matter right now).
 * I hope this helps you!
 * Regards,
    David
 *  Thread Starter [hardy2408](https://wordpress.org/support/users/hardy2408/)
 * (@hardy2408)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/setting-the-thumbnail-size/#post-8420936)
 * Thanks David.
 * I will check the changed thumbnail size with a local image next time, thanks.
 * Regards
    Gerhard

Viewing 2 replies - 1 through 2 (of 2 total)

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## Tags

 * [thumbnail size](https://wordpress.org/support/topic-tag/thumbnail-size/)

 * 2 replies
 * 2 participants
 * Last reply from: [hardy2408](https://wordpress.org/support/users/hardy2408/)
 * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/setting-the-thumbnail-size/#post-8420936)
 * Status: resolved