I changed the default image dimensions for the "large" thumbnail and re-generated my images using a plugin. The new image size is only shown on new posts created after the image size was created.

How do I make the old posts use the new image size too? They currently use the "large" thumbnail dimensions that were set and generated prior.

1 Answer 1


This simply doesn't work.

Wordpress resizes the images while uploading, so if you don't upload them again, nothing will happen.

  • 2
    This doesn't work out of the box, but that is what this site is for, isn't it?
    – kraftner
    Commented Jul 1, 2015 at 15:14

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