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Recently, the problem of bounding the sup norms ofL  2{L^{2}}   -normalized cuspidal automorphic newforms ϕ onGL  2{\mathrm{GL}_{2}}    in the level aspect has received much attention. However at the moment strong upper bounds are only available if the central character χ of ϕ is not too highly ramified. In this paper, we establish a uniform upper bound in the level aspect for general χ. If the level  N  is a square, our result reduces to

Optimal sup norm bounds for newforms on GL 2 with maximally ramified central character