MFEdit is a development tool specifically designed for alter.js. It allows users to adjust the layout of PC websites while viewing them on their screens.

alter.js is a lightweight JavaScript library that automatically converts smartphone websites into PC websites. With MFEdit, developers can easily fine-tune the layout of their PC websites by making real-time adjustments and optimizations.

This tool is a valuable asset for developers who want to ensure a seamless user experience across different devices. By using MFEdit, developers can efficiently adapt their PC websites to cater to mobile users without compromising on design or functionality.

Overall, MFEdit is a useful and practical development tool for those working with alter.js. Its intuitive interface and real-time editing capabilities make it an essential tool for optimizing PC websites for mobile devices.