By default, the toolbar of Rich Text Editor is responsive. On desktop Editor will use config.toolbar confirguration. On mobile Editor will use config.toolbarMobile confirguration.
Hello world!

<link rel="stylesheet" href="/richtexteditor/rte_theme_default.css" />
<script type="text/javascript" src="/richtexteditor/rte.js"></script>
<script type="text/javascript" src='/richtexteditor/plugins/all_plugins.js'></script>
<div id="div_editor1" style="width: 100%">
<p>Hello world!</p>
<p><img src='/images/editor-image.png' /></p>
</div>
<script>
var editor1 = new RichTextEditor("#div_editor1");
//editor1.setHTMLCode("Use inline HTML or setHTMLCode to init the default content.");
</script>
Editor uses different toolbar based on the space available. When the screen (browser window) gets smaller than 768px, editor should have mobile toolbar.