Select your paint. Do not attempt to apply latex or other brush-on paint to hinges, as it will impede the movement of the hinge and scratch off easily. Choose a spray paint that is formulated for metal in a color that complements your cabinets.
Using a screwdriver, remove the hinges from the cabinet frames and doors. If you have a large number of cabinets, a power drill with a screwdriver bit may be helpful.
Clean the hinges. Very dirty or rusty hinges should be cleaned with a wire brush dipped in CLR before being wiped with a damp rag. If there is no rust and the hinges are only slightly dirty, they may simply be cleaned with the rag alone.
Following the paint manufacturer's instructions for application, paint the hinges. While it is generally not necessary to paint the back side of the hinge plates, be sure to paint both sides of the center of the hinge in both an "open" and "closed" position to ensure thorough coverage.
After the paint has dried, reattach the hinges to your cabinets.