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MCPatcher is a java application that will allows you to switch between texture packs from one size to another sizes.
There are a lot of features:
Built-in utility for converting texture packs to resource packs 1.6.
Better Glass. More transparency options for glass textures.
Better Skies. Add your own textures to the day and night skies. Many options for fading and blending.
Extended animation, mipmapping, and font support.

Download (MCPatcher)