Can you put a pizza box in the oven?

Short answer: no. Keep the pizza box out of the oven. It is a real fire risk, and there are faster ways to reheat a slice anyway.

Why it is dangerous

A pizza box is cardboard, and cardboard catches fire. The auto-ignition point of paper and cardboard sits around 230°C (about 450°F), which is well within the range a home oven reaches. Set the oven to 250°C to crisp a pizza and you are heating the box past the point where it can ignite, especially near the element or the oven floor.

Even below that point, an oven dries the box out and can scorch it, and the inks and glue on a printed box are not meant to be heated against food. None of this is worth the few minutes you think you are saving.

"But the box says oven-safe"

It almost certainly does not. Some takeout containers are oven-rated, but standard corrugated and kraft pizza boxes are not among them. If a box is genuinely oven-safe, it states a temperature limit clearly on the box itself. When in doubt, assume it is not.

The better ways to reheat pizza

You want the crust crisp, not soggy, and you do not need the box for any of these.

• Skillet on the stove: medium heat, lid on for the last minute. Crisps the base and melts the cheese in about five minutes. The best result.
• Oven on the rack or a tray: 190°C for 8 to 10 minutes, pizza straight on the rack or on a baking sheet, no box.
• Air fryer: 160°C for 3 to 4 minutes. Fast and crisp.

The microwave works in a pinch but gives you a soft, chewy slice. A glass of water beside it helps a little.

A note on the box itself

Part of why people are tempted is that a flat-lidded box traps steam and the crust goes soft on the drive home, so they want to revive it. A better box prevents some of that in the first place. Vent holes let steam escape so the crust stays crisp, which matters most for thick, pan-baked styles. Our Detroit pizza boxes are cut square and deep with venting for exactly that reason. It will not make the box oven-safe, but it does mean fewer soggy slices to rescue.

So: never the oven for the box. Skillet for the slice.