How to Modify Allowed Upload Mime Types in WordPress

Snippets by IsItWP

Are you looking for a way to modify allowed upload mime types? While there’s probably a plugin for this, we have created a quick code snippet that you can use to modify allowed upload mime types in WordPress.

You add or remove allowed file types in the WordPress upload popup. By default, font files like .woff are not allowed to upload in WordPress and this code fixes that.


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

function edit_upload_types($existing_mimes = array()) {
    // allow .woff
    $existing_mimes['woff'] = 'font/woff';

    // add as many as you want with the same syntax

    // disallow .jpg files
    unset( $existing_mimes['jpg'] );

    return $existing_mimes;
add_filter('upload_mimes', 'edit_upload_types');

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: 28 best WordPress resume themes to create best impression and how to create a multi-page form in WordPress.

Comments   Leave a Reply

  1. //remove some file type from uploader
    add_filter( ‘upload_mimes’, ‘theme_restrict_mime_types’ );
    function theme_restrict_mime_types( $mime_types )
    $mime_types = array(
    //’wif’ => ‘text/plain’,
    //’doc|docx’ => ‘application/msword’,
    ‘jpg|jpeg’ => ‘image/jpeg’,
    //’gif’ => ‘image/gif’,
    ‘png’ => ‘image/png’
    return $mime_types;

    This code work on WP 5.X

  2. This code doesn’t work for me. I tried in functions.php of my child theme and as a site specific font. Adding tif and removing jpg. After that, it’s still impossible to upload tif and I can still upload a jpg.

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