为什么要把 HEIC 转为 JPG？
HEIC 是 iPhone 从 iOS 11 起的默认拍照格式。它以约 JPG 一半的体积存储高质量图片——对手机存储很友好，但在其他地方却是麻烦。大多数 Windows 电脑、旧安卓手机、邮件客户端、上传表单和政务网站都打不开 HEIC 文件。转为 JPG 能立刻解决兼容问题：JPG 几乎可以在所有设备、应用和网站上打开。
如何将 HEIC 转为 JPG
1. 把 .heic 文件拖到上方框内，或点击从设备中选择。可以一次转换多张。
2. 点击转为 JPG。每张照片都会在浏览器中解码并以高质量（92%）重新编码。
3. JPG 会自动下载——单个文件直接下载，多个文件打包为 ZIP。
本工具使用 WebAssembly 在您的设备上解码 HEIC。照片不会上传到任何服务器——涉及私人或敏感图片时这点很重要。
HEIC 与 JPG 对比
HEIC 技术上更先进：同样画质下体积更小，还支持实况照片、10 位色深等特性。JPG 赢在兼容性——没有其他格式能比。只要各平台还没原生支持 HEIC，转为 JPG 就是在苹果生态之外分享、上传和存档 iPhone 照片最实用的办法。
常见问题
What is a HEIC file?
HEIC (High Efficiency Image Container) is Apple's implementation of the HEIF standard, used as the default camera format on iPhones and iPads since iOS 11. It compresses photos more efficiently than JPG but is poorly supported outside Apple devices.
Will I lose quality converting HEIC to JPG?
At the 92% quality setting this tool uses, the difference is invisible in normal viewing. You will lose Apple-specific extras like Live Photo motion and Portrait depth data, which JPG cannot store. Keep your original HEIC files if those matter.
Why can't Windows open my iPhone photos?
Windows does not ship with HEVC decoding built in. You can buy a codec from the Microsoft Store for viewing, but converting to JPG is the simpler fix when you need to share, upload or edit the photos.
Are my photos uploaded anywhere?
No. Decoding runs in WebAssembly inside your browser tab. Your photos never leave your device — not even their metadata.
Can I convert multiple HEIC files at once?
Yes. Select several files and they are all converted; multiple outputs are bundled into a single ZIP download.
What is the difference between HEIC and HEIF?
HEIF is the container standard; HEIC is Apple's version of it using HEVC compression. In practice the terms refer to the same .heic files your iPhone creates.