Converting a HEIC photo to PNG makes sense when the image is going into an editor rather than straight to a website or a message. PNG is lossless, so every save after this point keeps the pixels exactly, while repeated JPG saves gradually add compression artifacts. That matters for photos you plan to retouch, crop several times, or use as the base of a cut-out where you will later remove the background and need transparency. This page opens with PNG selected as the output; drop the HEIC files and convert. Safari reads HEIC natively, and other browsers load a decoder the first time, after which the work happens on your device. Be prepared for the file size. A 12 megapixel phone photo that is 2 to 3 MB as HEIC can easily become 15 to 25 MB as PNG, because PNG compression is designed for flat graphics and screenshots, not photographic detail. If the goal is only to open or share the photo, JPG is the better target. The resize option can bring the dimensions down at the same time if the full resolution is not needed. For everyday sharing use HEIC to JPG Converter, and for the smallest web-ready file see PNG to WebP Converter.
Choosing the right image format for web use has a significant impact on file size and quality. JPEG (Joint Photographic Experts Group) uses lossy compression optimized for photographs: it discards subtle color gradients in ways the human eye does not easily notice, achieving compression ratios of 10:1 to 20:1 at acceptable quality. PNG (Portable Network Graphics) uses lossless compression and supports full transparency (alpha channel), making it ideal for logos, icons, screenshots, and images with sharp edges or text. WebP is Google's modern format that achieves better compression than both JPEG and PNG at equivalent quality: typically 25 to 35 percent smaller than JPEG at the same quality setting, and 26 percent smaller than PNG for lossless images. WebP also supports transparency like PNG. GIF (Graphics Interchange Format) is the oldest format still in use, primarily kept alive by its support for animation. For still images, GIF is inferior to PNG in both quality and compression, limited to 256 colors per frame. Converting to WebP for web delivery is the most impactful single optimization for image-heavy sites. Browser support for WebP is now essentially universal (Chrome, Firefox, Safari 14+, Edge). For cases where legacy Safari support is required, serving WebP via a picture element with a JPEG fallback provides the best result across all browsers.