Get URLs for All Sizes of Image via Admin Panel

This is a good idea. Thanks for suggesting it—going to use it. 🙂

You can add a column to the Media Library that outputs the paths. This will spit them all out. You could of course filter it to only show the sizes you actually want. Put in functions.php or similar.

// Adds a "Sizes" column
function sizes_column( $cols ) {
        $cols["sizes"] = "Sizes";
        return $cols;
}

// Fill the Sizes column
function sizes_value( $column_name, $id ) {
    if ( $column_name == "sizes" ) {
        // Including the direcory makes the list much longer 
        // but required if you use /year/month for uploads
        $up_load_dir =  wp_upload_dir();
        $dir = $up_load_dir['url'];

        // Get the info for each media item
        $meta = wp_get_attachment_metadata($id);

        // and loop + output
        foreach ( $meta['sizes'] as $name=>$info) {
            // could limit which sizes are output here with a simple if $name ==
            echo "<strong>" . $name . "</strong><br>";
            echo "<small>" . $dir . "https://wordpress.stackexchange.com/" . $info['file'] . " </small><br>";
        }
    }
}

// Hook actions to admin_init
function hook_new_media_columns() {
    add_filter( 'manage_media_columns', 'sizes_column' );
    add_action( 'manage_media_custom_column', 'sizes_value', 10, 2 );
}
add_action( 'admin_init', 'hook_new_media_columns' )

Using <small> as a quick and dirty hack to keep the size of long URLs in check. In production I’d probably make this a <dl> and add some admin CSS to adjust its display via site plugin.

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