Resetting Android Permissions When you open a particular file type on Android, such as BMP, you're given a menu offering a choice of compatible apps with which to open it.

Why Convert BMP to JPG? BMP (Bitmap) files are uncompressed and often quite large, which can make them difficult to store, upload, or share online. Converting BMP to JPG dramatically reduces file size ...

Launch PDFill and open the grayscale PDF that you want to convert to a BMP file. The steps that follow will also work with a color PDF document.