What is HEIC, and why did Apple switch to it?
HEIC is the file extension for photos stored in the HEIF container using the HEVC video codec — the same compression technology behind 4K video. Apple made it the iPhone's default photo format with iOS 11, and the reason is simple efficiency: an HEIC photo holds roughly twice the quality per megabyte of a JPG, supports 10-bit color for smoother gradients, and can store extras like Live Photo video and depth data in a single file. For Apple, whose users shoot thousands of photos on limited storage, halving photo sizes was an obvious win. The trade-off is compatibility. JPG has been readable everywhere since 1992; HEIC is still a stranger to Windows PCs, many Android apps, older software, and most of the web. So your iPhone happily shoots in a format half your destinations cannot open — which is exactly the gap this converter fills.
Stop shooting HEIC: change your iPhone camera settings
If you are tired of converting, you can make your iPhone shoot JPGs again. Open Settings, go to Camera, tap Formats, and choose Most Compatible. From then on, new photos save as JPG instead of HEIC. There are two things to know before you switch. First, it only affects new photos — everything already in your library stays HEIC until you convert it. Second, JPG files are roughly twice as large as HEIC at the same quality, so you will burn through storage faster; on a 64GB iPhone that difference is real. Many people keep High Efficiency (HEIC) enabled for the storage savings and convert only the photos they need to share outside Apple's ecosystem. Either way, the choice is yours — and reversible at any time from the same settings screen.
How to convert HEIC to JPG on iPhone and Windows
On an iPhone or Mac, it could not be simpler: open this page in Safari, drop in your HEIC photo, and download the JPG. Safari decodes HEIC natively, so conversion happens on your device in a second or two — no app to install, no account, no upload. On Windows, the honest answer is that Chrome, Edge, and Firefox cannot decode HEIC files at all, because Windows does not ship an HEIC decoder to browsers by default. No website can convert a file the browser itself cannot open, so if you try here on Windows you will get a clear message instead of a silent failure. Your options: install Microsoft's free HEIF Image Extensions from the Microsoft Store (which enables HEIC viewing in some apps), transfer the photos to an iPhone or Mac and convert them there in Safari, or change your iPhone's camera settings so future photos arrive as JPG in the first place.
HEIC vs JPG: quality, size, and compatibility
Technically, HEIC wins on both quality and size: better compression, wider color, smaller files. But a photo format is only as good as its compatibility, and there JPG is undefeated — every operating system, browser, printer, email client, and photo frame from the last three decades opens JPG without blinking. Converting HEIC to JPG at 85–90% quality loses nothing you can see; the JPG will simply be a larger file than the HEIC was, because JPG's older compression needs more bytes for the same image. For sharing, uploading, archiving outside Apple Photos, or sending to anyone on Windows, JPG remains the pragmatic choice. Keep the HEIC originals as your masters if storage matters, and export JPG copies whenever a photo needs to travel.