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Applied to the size of the thumbnail when uploading an image. Filter function arguments: image side max size, attachment ID, attachment file name.

This description was scraped automatically from the WordPress filter reference or action reference. If it looks like this is the wrong description, please tell me so I can fix my code.

WordPress version history for wp_thumbnail_max_side_length

This database has information for all major versions from WP 1.2.1 through 6.2.

Version File Line Type
2.1 wp-admin/admin-functions.php 2118 View in context filter
2.2 wp-admin/admin-functions.php 2207 View in context filter
2.3 wp-admin/includes/image.php 153 View in context filter

Important warning!

This hook does not occur in the most recent version of WordPress (6.2). Do not use it. It is deprecated. You should look at the list of "related hooks" below to see if you can figure out what replaced it.

Related Hooks

We find related hooks using word stems. wp_thumbnail_max_side_length has 4 significant word stem(s): thumbnail, max, side, length. Note that some of the hooks below may not appear in all versions of WP.