Using WordPress ‘image_editor_default_mime_type’ PHP filter

The image_editor_default_mime_type WordPress PHP Filter allows you to modify the default mime type before getting the file extension.

Usage

add_filter('image_editor_default_mime_type', 'custom_image_editor_default_mime_type', 10, 1);

function custom_image_editor_default_mime_type($mime_type) {
    // your custom code here
    return $mime_type;
}

Parameters

• $mime_type (string) – Mime type string.

More information

See WordPress Developer Resources: image_editor_default_mime_type

Examples

Change Default Mime Type to PNG

Change the default mime type to “image/png” for the image editor.

add_filter('image_editor_default_mime_type', 'change_default_mime_type_to_png', 10, 1);

function change_default_mime_type_to_png($mime_type) {
    $mime_type = 'image/png';
    return $mime_type;
}

Force SVG Mime Type

Force the SVG mime type for the image editor.

add_filter('image_editor_default_mime_type', 'force_svg_mime_type', 10, 1);

function force_svg_mime_type($mime_type) {
    $mime_type = 'image/svg+xml';
    return $mime_type;
}

Allow WebP Mime Type

Allow the WebP mime type for the image editor.

add_filter('image_editor_default_mime_type', 'allow_webp_mime_type', 10, 1);

function allow_webp_mime_type($mime_type) {
    $mime_type = 'image/webp';
    return $mime_type;
}

Change Mime Type Based on User Role

Change the default mime type based on the current user’s role.

add_filter('image_editor_default_mime_type', 'change_mime_type_based_on_user_role', 10, 1);

function change_mime_type_based_on_user_role($mime_type) {
    $user = wp_get_current_user();
    if (in_array('administrator', $user->roles)) {
        $mime_type = 'image/png';
    } else {
        $mime_type = 'image/jpeg';
    }
    return $mime_type;
}

Add Custom Mime Type for Custom Image Format

Add a custom mime type for a custom image format.

add_filter('image_editor_default_mime_type', 'add_custom_mime_type', 10, 1);

function add_custom_mime_type($mime_type) {
    $mime_type = 'image/my-custom-format';
    return $mime_type;
}