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For the first time, we present the size evolution of a mass-complete(log(M*/Msol)>10) sample of star-forming galaxies over redshifts z=1-7,selected from the FourStar Galaxy Evolution Survey (ZFOURGE). Observed H-bandsizes are measured from the Cosmic Assembly Near-Infrared Deep ExtragalacticLegacy Survey (CANDELS) Hubble Space Telescope (HST)/F160W imaging.Distributions of individual galaxy masses and sizes illustrate that a clearmass-size relation exists up to z~7. At z~7, we find that the average galaxysize from the mass-size relation is more compact at a fixed mass oflog(M*/Msol)=10.1, with r_1/2,maj=1.02+/-0.29 kpc, than at lower redshifts.This is consistent with our results from stacking the same CANDELS HST/F160Wimaging, when we correct for galaxy position angle alignment. We find that thesize evolution of star-forming galaxies is well fit by a power law of the formr_e = 7.07(1 + z)^-0.89 kpc, which is consistent with previous works for normalstar-formers at 1<z<4. In order to compare our slope with those derived Lymanbreak galaxy studies, we correct for different IMFs and methodology and find aslope of -0.97+/-0.02, which is shallower than that reported for the evolutionof Lyman break galaxies at z>4 (r_e\propto(1 +z)^-1.2+/-0.06). Therefore, weconclude the Lyman break galaxies likely represent a subset of highlystar-forming galaxies that exhibit rapid size growth at z>4.

The Size Evolution of Star-forming Galaxies Since z~7 Using ZFOURGE