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Quick answers.

›Why use em units instead of pixels?

Using `em` units for letter spacing ensures the tracking scales proportionally if the font size changes. This maintains the intended visual density across different screen sizes and user settings.

›When should I use negative letter spacing?

Negative tracking is usually reserved for large headings or display type. As font size increases, the optical space between characters appears larger, so tightening the spacing helps the word shape remain cohesive.

›Does this tool work with any font?

Yes. While different typefaces have unique internal metrics, the calculator provides a standard optical starting point that can be applied to any web font or system font via CSS.

›What is the difference between kerning and tracking?

Tracking or letter spacing is the uniform adjustment of space across a whole range of characters. Kerning refers to the adjustment of space between specific pairs of individual letters.