BLP2PNG does not have a graphical user interface. You can drag-and-drop files or folders onto it and it will convert them, or you can use it from command-line environments such as development tools (as I do). If you're looking for a tool with a file picker and buttons, this isn't it.
This tool is used for converting bi-directionally between BLP and PNG images. The tool fully supports alpha channels and can be used as a drag-and-drop converter or from the command line. It can also convert your existing TGA files to PNG.
BLP2PNG will convert the file based on the original type:
* BLP are converted to PNG
* BMP are converted to PNG
* TGA are converted to PNG
* PNG are converted to BLP
If you drop a folder onto it, it will recursively convert every BLP image in the folder to a PNG. This is very handy for mass-converting the Blizzard artwork folder after a new patch.
Version 1.2 changes:
- Added ability to drag-and-drop entire folders for conversion from BLP to PNG
- Added 'squish' library for compressing texture for much better results when generating BLPs