F606W+F814W colour images of the 74 MATLAS UDGs, selected with a cut of ⟨μ_e, g⟩> 23.3 mag arcsec⁻² and R_e > 1.0 kpc, observed with HST/ACS (top, left to bottom, right) shown by decreasing surface brightness. Due to their low surface brightness, the galaxies in the last rows are difficult to see in the images. The names and distances of the UDGs are displayed on the images. The size of each cutout is 1.3′×1.3′.