DevConverter converts your image files online. Amongst many others, we support PNG, JPG, GIF, WEBP and HEIC. You can use the options to control image resolution, quality and file size.
HEIF/HEIC is an image file format which encapsulates HEVC (High Efficiency Video Codec) encoded images. In comparison to JPG, it reduces the file size by up to 50%. Starting with iOS11, HEIC is the new standard format for storing images on Apple's mobile devices.