The Unit Conversion Extension is a free tool designed for Google Chrome that facilitates quick conversions between metric and imperial units. Users can simply highlight the desired unit, and the extension will automatically convert it to its opposite, displaying the result in a convenient tooltip. This functionality enhances productivity and simplifies the process of understanding measurements across different systems.

Additionally, the extension allows users to customize the tooltip's display duration and format through the extension button located in the Chrome extensions dropdown menu. It currently supports conversions for various units, including temperature (°C to °F), distance (kilometers to miles), weight (kilograms to pounds), and more. The easy access via the right-click context menu further streamlines the conversion process, making it a practical tool for anyone needing quick measurements.