PX to EM is a free Chrome add-on developed by Updula. This handy tool allows users to easily convert pixel (PX) values to relative EM units.

With PX to EM, users can quickly and accurately convert PX values to EM units, which are commonly used in responsive web design. This add-on is especially useful for web developers and designers who need to convert pixel measurements to relative units for flexible and responsive layouts.

The program offers a simple and intuitive interface, making it easy to input the desired pixel value and instantly see the corresponding EM unit. This saves time and effort, eliminating the need for manual calculations or online conversion tools.

Overall, PX to EM is a valuable tool for web developers and designers who work with responsive web design. Its ease of use and accurate conversions make it a must-have add-on for anyone in need of converting pixel values to relative EM units.