Preparation of hierarchical zeolites via a chemical etching is a hot topic as it strongly improves microporous material's diffusive properties and thus their catalytic activity. However, an issue that is often neglected is the softening the post-treatment condition. Herein we we report the optimization of NH4F etching, using less concentrated solutions and milder treatment conditions. Following characterization by ICP-AES, XRD, 27 Al MAS NMR, TEM, and N2 physisorption, it has been shown that it is possible to soften the post-treatment conditions by playing with three synthesis parameters: (1) Decreasing the NH4F/ZSM-5 wt/wt ratio allows the generation of mesopores of different diameter (from 27 to 55 nm); (2) Decreasing the etching time provides precise control over the textural properties of the hierarchical ZSM-5; (3) Decreasing the initial NH4F weight concentration also allows to tune the pore diameter from large (55 nm) to a small mesopore (5 nm).