foam knife

Why a Foam Knife Makes All the Difference

A dedicated foam knife is the fastest way to turn a slab of upholstery foam into a crisp, perfectly sized cushion. Scissors pinch and box cutters tear, but the right foam cutting tool glides through thick sheets and leaves straight, square edges that sit neatly inside your fabric cover.

What to Look For

Electric vs. Manual

An electric foam cutter uses reciprocating serrated blades to slice deep cushion foam with little effort, making it a great fit for seat cushions, bench pads, and mattress toppers. Many sewists even use an electric carving knife for foam on smaller jobs. Manual blades work well for thinner sheets and quick trims.

Blade Length and Comfort

• Choose a blade longer than your foam is thick so you can cut in one clean pass.
• Look for a comfortable grip to reduce hand fatigue on big projects.
• Check whether a replacement serrated foam blade is easy to find.

Tips for Upholstery Foam Cutting

Mark your lines with a marker and straightedge, keep the blade vertical, and let the tool do the work instead of forcing it. Slow, steady strokes give the smoothest edge.

Ready to start your next cushion project? Browse our selection of foam knives and cutting tools below.