This page evaluates the Laplacian of a 2D or 3D vector field. That is,
$\qquad \Delta f(x, y, z) = \nabla \cdotp \nabla f = \nabla^{2} f = \dfrac{\partial^{2} f}{\partial x^{2}} + \dfrac{\partial^{2} f}{\partial y^{2}} + \dfrac{\partial^{2} f}{\partial z^{2}}$.

The 2D or 3D vector field $f(x, y, z)$.