The Pixel to Rem/EM Converter is a simple and fast utility for web developers working on responsive and scalable designs. It helps you easily convert between fixed pixel (px) values and relative units like `rem` (relative to the root element's font-size) and `em` (relative to the parent element's font-size). You can set a custom base font size and convert any value to its equivalent in the other units, streamlining your CSS workflow.

1. First, set the "Base Font Size" in pixels. This is typically 16px for most browsers, but you can change it to match your project's root font-size.
2. Enter a value in any of the three input cards: "Pixels (px)", "REM", or "EM".
3. The other two fields will automatically update to show the converted values based on your input and the base font size.
4. Click the copy icon next to any value to copy it to your clipboard.