  We show how the Weyl anomaly generated by gauge fields, can be computed from
manifestly gauge invariant and diffeomorphism invariant exact renormalization
group equations, without having to fix the gauge at any stage. Regularisation
is provided by covariant higher derivatives and by embedding the Maxwell field
into a spontaneously broken $U(1|1)$ supergauge theory. We first provide a
realisation that leaves behind two versions of the original $U(1)$ gauge field,
and then construct a manifestly $U(1|1)$ supergauge invariant flow equation
which leaves behind only the original Maxwell field in the spontaneously broken
regime.
