Abstract: A light-emitting diode and a light-emitting device are provided. The light-emitting diode includes a semiconductor stack layer and a first electrode. The semiconductor stack layer has a light output surface and a back surface opposite to each other. On the back surface, the semiconductor stack layer has a first mesa exposing a first semiconductor layer thereof and a second mesa adjacent to the first mesa. The first electrode formed on the back surface of the semiconductor stack layer at least surrounds a portion of the second mesa, and the first electrode surrounding a portion of the second mesa extends toward the light output surface. The first electrode has a first chamfer portion, and the second mesa has a second chamfer portion. The first electrode and the second mesa have a minimum distance L, and a radius of curvature of the second chamfer portion is greater than or equal to ?{square root over (2)}L.