An asymmetric dioxazine compound represented by the following formula (I) in the free acid form:

wherein A₁ and A₂ independently of one another are each sulfo, halo, alkyl or alkoxy, X₁ and X₂ independently of one another are each hydrogen, halo, alkyl, alkoxy or phenoxy, R₁ is hydrogen or unsubstituted or substituted alkyl, R₂ and R₃ independently of one another are each hydrogen, alkyl, alkoxy, halo or unsubstituted or substituted amino, Z is a fiber-reactive group, m and n independently of one another are each 0 or 1, provided that m≠n, and L is 1 or 2. This compound is suitable for dyeing and printing cellulose fiber, natural and synthetic polyamide fibers, polyurethane fiber, leather and the like and mixed yarns thereof, to obtain dyed or printed products of a color fast to light, wetness and chlorine with superior build-up and level dyeing properties.