Best Corner Rounders for MTG Proxies

Square Corners Are the Tell

Pick up a proxy with square corners and your hand knows before your eyes do. The radius is wrong. Magic's corner sits in the 2-3 mm range. That specific, gentle curve. Matching it costs $10 and one squeeze per corner.

The Radius Problem

Most people buy the first corner rounder they find. That's usually a mistake. Rounders come in a spread of radii, and the aggressive curve sold for laminating badges or ID cards is too tight. It looks different from a real card. Too tight reads just as fake as no round at all.

Test every new punch on a scrap before you run it on a deck. One bad radius on 100 cards is a long afternoon with scissors. For a full rundown of what to cut with before you round, see our paper trimmer comparison.

Single-Punch vs Multi-Card

Single-card punches are $8-12, precise, and handle everyday touch-ups. Four corners per card. Slow, but manageable for a deck.

Heavy-duty multi-card rounders cut a small stack in one pass. If you're rounding cubes or running batches weekly, the time difference is substantial. Higher upfront cost; justified at volume.

Cardstock Weight Matters for Punch Choice

Cheap single-card punches choke on thick stock. Anything above 200 gsm or a double-sleeved card will leave ragged, incomplete corners on a light punch. If you print heavy, buy heavy. Get a rounder rated for the thickness. (Not sure what gsm your stock is? See the proxy paper weight guide.)

Round after you cut. Never before. You need square edges to align the cut, and rounding first removes the reference edge. Test the radius on a scrap first, every batch.