📱 HEIC 转 BMP（iPhone 照片）HEIC to BMP Converter

使用说明与常见问题How-to & FAQ

「HEIC 转 BMP（iPhone 照片）」是什么？What is the HEIC to BMP Converter tool?

把 iPhone 的 HEIC/HEIF 照片批量转换为 24 位 BMP 位图：给只认 BMP 的老软件、工控屏、证件照系统和打印设备使用，多张打包 ZIP，照片只在浏览器本地处理。Batch-convert iPhone HEIC/HEIF photos to 24-bit BMP bitmaps for legacy software, industrial displays, ID-photo systems and printers that only take BMP. Download each file or a ZIP; photos are processed only in your browser.

如何使用「HEIC 转 BMP（iPhone 照片）」？How do I use the HEIC to BMP Converter tool?

在「HEIC 转 BMP（iPhone 照片）」中，选择或拖入文件，然后点击「全部下载（ZIP）」按钮即可。In the HEIC to BMP Converter: Choose or drop your files, then click "Download all (ZIP)".

为什么 BMP 比 HEIC 大几十倍？Why is the BMP dozens of times larger than the HEIC?

HEIC 用 HEVC 高效压缩，一张 1200 万像素的照片约 1–3 MB；BMP 完全不压缩，同样的照片约 36 MB（宽 × 高 × 3 字节）。画质与解码后的照片相同，但只建议在设备明确要求 BMP 时使用。HEIC uses efficient HEVC compression, so a 12 MP photo is about 1–3 MB; BMP is uncompressed, so the same photo is about 36 MB (width × height × 3 bytes). The picture matches the decoded photo, but use BMP only when a device requires it.

HEIC 是什么？第一次为什么慢？What is HEIC, and why is the first run slow?

HEIC 是 iPhone 和不少安卓手机默认的照片格式（HEIF 容器 + HEVC 编码），Windows、网页和很多软件不能直接打开。解码组件 heic2any（MIT，内含 LGPL 许可的 libheif）约 1.3 MB，第一次转换时才加载；实况照片和连拍只取主图。少数带透明通道的 HEIC（iPhone 照片没有）目前读不出透明信息，透明区域会按不透明处理，转换后会在结果旁提示。HEIC is the default photo format on iPhones and many Android phones (HEIF container + HEVC), which Windows, websites and many apps cannot open directly. The decoder, heic2any (MIT, bundling LGPL-licensed libheif), is about 1.3 MB and loads on first use; Live Photos and bursts give the main image only. The rare HEIC files with an alpha channel (iPhone photos have none) can't have their transparency read yet, so transparent areas come out opaque; the result row says so.

BMP 是什么格式？What kind of BMP is produced?

输出 24 位无压缩 BMP（Windows 位图），兼容几乎所有软件和老设备，但文件很大（宽 × 高 × 3 字节）。An uncompressed 24-bit Windows bitmap that almost any software or legacy device can read, but large (width × height × 3 bytes).

图片会上传吗？Are my images uploaded?

不会。解码和编码都在你的浏览器里完成，文件不会离开你的设备；照片中的 EXIF 元数据（包括拍摄位置）不会写入输出文件。No. Decoding and encoding happen in your browser and files never leave your device; EXIF metadata in photos (including location) is not written to the output.

「HEIC 转 BMP（iPhone 照片）」免费吗？需要注册吗？Is the HEIC to BMP Converter free? Do I need an account?

「HEIC 转 BMP（iPhone 照片）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The HEIC to BMP Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.