  We evaluate the vector and scalar form factor of the pion in the presence of
virtual photons at next-to-leading order in two-flavor chiral perturbation
theory. We also consider the scalar and tensor pion form factors of the
energy-momentum tensor. We find that the intrinsic electromagnetic corrections
are of the expected size for the vector form factor and very small for the
charged pion scalar form factor. Detector resolution independent photon
corrections reduce the vector radius by about one percent. The scalar radius of
the neutral pion is reduced by two percent by isospin-breaking contributions.
We perform infrared regularization by considering electron-positron
annihilation into pions and the decay of a light Higgs boson into a pion pair.
We discuss the detector resolution dependent contributions to the various form
factors and pion radii.
