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Put the material through a shredder to make finely shredded confetti.
Feed regular-weight paper, such as printer paper, into a shredder until you've made as much confetti as you need. For the tiniest confetti, use a micro-cut shredder instead of a cross-cut shredder.  Avoid running materials, such as ribbons or garland, through the shredder since these may snag. If you use heavier cardstock paper, the edges of the paper may tear or look ragged.