WordPress's automatic responsive image code is setting the size of certain images larger than it should be. Here is an example:

How can I change the responsive image code being generated from WordPress to change, so the image can never be set to a size larger than it's default size? All images are different dimensions, so I won't be able to hard-code a width into the code.

Any help or direction to resources would be much appreciated.

  • Now that you mention it, I also wondered about it this week. A page I found: make.wordpress.org/core/2015/11/10/… Hopefully someone can help us out. Apr 9, 2016 at 0:31
  • I'm not able to reproduce your problem using the default themes. Might it be something related to yours? In any case, you can have a look at max_srcset_image_width. In the comments there is a solution that might work for you.
    – Luis Sanz
    Apr 9, 2016 at 8:28
  • Thanks for your help @LuisSanz. I looked into both of these options. They still seem to require hard-coding a width, which won't really work since it needs to be more dynamic.
    – Andrew
    Apr 11, 2016 at 15:46
  • @Andrew, the idea is to set some logic in the filter. You can access the images $size_array to compare each on an individual basis. I would help you gladly if I were able to reproduce the problem.
    – Luis Sanz
    Apr 11, 2016 at 17:29
  • @LuisSanz, okay, I think I figured out the issue. I posted the answer below.
    – Andrew
    Apr 11, 2016 at 17:57

1 Answer 1


The issue I was having was with some conflicting code I had in my functions file (see below). I usually use this code to remove width/height attributes from being hard-coded into the element in the content area. Removing these somehow appears to mess up the new responsive image implementation in WordPress though. As soon as I removed this code, the responsive images appear to be working as expected.

Conflicting Code

// Remove Width & Height Attributes from Inserted Images
add_filter( 'post_thumbnail_html', 'remove_width_attribute', 10 );
add_filter( 'image_send_to_editor', 'remove_width_attribute', 10 );

function remove_width_attribute( $html ) {
   $html = preg_replace( '/(width|height)="\d*"\s/', "", $html );
   return $html;

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