The twenty fifteen theme always crops featured images, it cuts from both lower and upper part of the image usually.

How to prevent it? How to show the normal (full) dimensions of featured images?

In functions.php:

add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 825, 510, true );

changing above to higher dimensions dont take any effect. How to fix?

  • Have you found a solution to avoid cropping completely for the featured image?
    – collimarco
    Mar 10, 2021 at 13:21

1 Answer 1


if you already uploaded the image, and change the resolution, it will not affected, unless you regenerate the thumbnail or upload a new one.

  • how can I do that to all of previously uploaded images? Their upper and lower parts cropped in twenty fifteen theme.
    – Fixiywp
    Dec 6, 2020 at 12:31
  • I usually use plugin regenerate thumbnail to do that.
    – Tiyo
    Dec 7, 2020 at 8:44

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