Bitmap Masking provides a free, easy to use tool for creating image masks for BMP formats. The application is built in Java and is portable meaning you only have to extract the contents of the archive and run the Jar file. Using it is quite intuitive, simply locate your Bitmap folder, set mask coordinates, select the images you need to perform masking on and the output format. It supports BMP, JPG, PNG extensions.

Bitmap Masking is very light and will process your files with with great speed....Read more about Bitmap Masking