What format photos can be transparent

In the format of our commonly used images, images such as BMP and JPG cannot hold transparent information, and the system will default to a white background. GIF format pictures can save transparent information, but GIF format can only have a picture of up to 256 colors, so you can only use in the picture is not high requirements. Another format: PNG format, PNG-format pictures Support lossless compression, and can be very good to save transparent information.
Summary: Only PNG and GIF formats can hold transparent information. The transparent format of PNG is better, if there is a gradual transparency effect can be well preserved. Images in GIF format can be transparent, but not transparent. The relative picture quality is worse than PNG, but the size of the KB is relatively small.

What format photos can be transparent