I keep trying to export 300dpi PNGs from Illustrator, on a 1500×1500 px artboard, and they keep turning out really small and pixelated, not big, beautiful, and vector-like as usual! Help!
Don’t use Export, use “Save For Web” which lets you preview and specify the exact pixel dimensions to output.
If you want to base it on your art board then make sure that option is checked. Of course start with 300 DPI.