HEIC→JPG変換

This tool decodes Apple's HEIC and HEIF photos right in your browser and saves a standard JPG, with no upload and no app to install.

HEIC (High Efficiency Image Container) is the format iPhones and iPads use by default. It stores photos at noticeably smaller file sizes than JPG at similar quality, which is great for your camera roll but awkward when you need to share.

Your photos are never uploaded, so even personal pictures stay private on your own device.

The catch is compatibility: many websites, older apps, Windows tools and email clients cannot open HEIC. Converting to JPG turns an iPhone photo into a file that opens essentially everywhere.

Decoding is done locally using a WebAssembly build of libheif, the standard open-source HEIC decoder, so the heavy lifting happens on your device rather than on a server. You set the JPG quality before downloading.

The first conversion is a little slower because the decoder module loads on demand. After that it is cached and subsequent conversions are quick.

Because JPG is a lossy format, converting re-encodes the image, so pick a high quality if you want the result to stay close to the original.