When you unbox your new Ledger Nano S, the manufacturer provides a small blank recovery card with 24 seed word slots. If you have tidy penmanship you might not need this recovery card generator, but since they only supply one blank card, you really only have one shot to ink this card perfectly. Ballpoint pen ink can also smudge and, or fade. If you have OCD like me and prefer your card to be clean and tidy using typeface font you can simply open and save this fillable pdf to your computer. Once filled out you can print and trim out 2 recovery cards and store them in a secure place. You should never store recovery cards online.
All seed words come from your device and derived from this github page.