Fontknife

TL;DR: Rasterize & export only the glyphs you need

You can make sprite sheets of entire fonts:

  1. fontknife convert tom-thumb.bdf sheet.png

  2. Use the resulting image file:

    The contents of tom-thumb.bdf converted to a sprites sheet

    (Shown at 200% size)

Only need some of the glyphs? Sure:

  1. fontknife convert -P 48 -G "💪😎" NotoEmoji-Regular.ttf sheet.png

  2. Use the sheet in your project:

    The cool sunglasses and flexed bicep emoji as a png