Bitmap image converter for embedded programming and so on, runs on client-side JavaScript only, converts all image formats your web browser supports into data array such as uint8_t or simple binary file, also can decrease color depth for low-bits image such as 8-bit, 16-bit or 1-bit B/W.
This tool can be used directly from the link below.
https://yamamaya.github.io/BitmapConverterWeb/