If you need to provide your clients with small map images available on high-resolution devices, such as iPad, iPhone, Macbook Pro, or a high-end Android device, you can use the RETINA option (HiDPI tiles), which is available in MapTiler Plus and MapTiler Pro for Standard Tiles.
This option will create a high-resolution (HiDPI) tiles with a size of 512x512px (instead of default 256x256px). You can set this option, by activating the checkbox on the Output tile format definition page. This option is active only if you are using the Pro version of MapTiler https://www.maptiler.com/pricing/.