UMEditor is a lightweight, fast‑loading mini version of Baidu’s UEditor rich‑text editor, packaged in a single ~140 KB JavaScript file and built without iframes. It provides a customizable, plugin‑friendly toolbar and supports common features such as image upload, formula insertion, and draft saving, working with PHP, ASP, JSP and .NET back‑ends. The library is aimed at web developers who need a simple, high‑performance WYSIWYG editor for posting and reply boxes on portal‑style sites.