Resizing 2D textures for display models

[crimson timber]

I've been tyring for hours to change the size of a custom sword 2D texture but it always ends up being the same size when I load in the game but blurrier. I found a way to resize it by applying it to the face of a 3D model and mirroring it on both sides but the resource pack I have doesn't recognize it cause of the "bbmodel" file, and every time I change it to a png the texture gets messed up. Is there another easier way to make the texture bigger in the model or convert the file to a png that doesn't mess up the texture, or have I just been doing this entirely wrong, really at my wit's end here.

[fickle plover]

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[limber tartan]

items in Minecraft use json files, if you created your file as a "block/item" model it should be able to be exported as one

bbmodels are only used by Blockbench

!faq texture to 3d