How to Adjust Vimeo Auto-Embed Size in WordPress

Snippets by IsItWP

Are you looking for a way to adjust the width/height of the auto-embedded video iframe from Vimeo? While there’s probably a plugin for this, we have created a quick code snippet that you can use to adjust Vimeo auto-embed size in WordPress. Make sure that your WordPress site has auto-embeds enabled.


All you have to do is add this code to your theme’s functions.php file or in a site-specific plugin:

function fixEmbed($oembvideo, $url, $attr) {
  if(strpos($url,'vimeo.com')!== false) {
    // check if url is for Vimeo video
    $width = 0;
    $height = 0;
    $newheight = 0;
    $attrstart = strpos($oembvideo,'width="');
    if($attrstart !== false) {
      $attrstart += 7;
      $width = substr($oembvideo, $attrstart, strpos($oembvideo,'"',$attrstart+1)-$attrstart);
      $attrstart = strpos($oembvideo,'height="');
      if(($attrstart !== false) && $width>0) {
 	$attrstart += 8;
        $height = substr($oembvideo, $attrstart, strpos($oembvideo,'"',$attrstart+1)-$attrstart);
        $newheight = round($height*$attr['width']/$width);
        $oembvideo = str_replace('height="'.$height,'height="'.$newheight, str_replace('width="'.$width,'width="'.$attr['width'], $oembvideo));
  return $oembvideo;
add_filter('embed_oembed_html', 'fixEmbed', 10, 3);

Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly add code snippets in WordPress, so you don’t accidentally break your site.

If you liked this code snippet, please consider checking out our other articles on the site like: 19 best WordPress plugins for non-profits and how to create a multi-page form in WordPress.

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