There are two font variations for you to play with.
In the default “Solved font”, you see the full
crease pattern and resulting cut lines which reveal the letter.
In the “Puzzle font”, all but one of the cut lines
is hidden; the letter is revealed by folding and cutting along the
extension of that green segment.
If you'd like to see animations of the folding process,
try the "Simulate in Origami Simulator" button.
(This currently works best with just a single letter,
and with letters that have no holes.)
Here are printable PDFs for all the letters:Red lines are mountain folds; blue lines are valley folds;
and green lines are cuts.