EN
Bounding sup-norms of modular forms in terms of the level has been the focus of much recent study. In this work the sup-norm of a half-integral weight cusp form is bounded in terms of the level: we prove that $||y^{κ/2}f̃||_∞ ≪ _{ε,κ} N^{1/2 - 1/18 +ε}||y^{κ/2}f̃||_{L^2}$ for a modular form f̃ of level 4N and weight κ, a half-integer.