🖼️ AVIF 转 BMPAVIF to BMP Converter

使用说明与常见问题How-to & FAQ

「AVIF 转 BMP」是什么？What is the AVIF to BMP Converter tool?

把 AVIF 图片批量转换为 24 位 BMP 位图：几乎所有老软件、工控设备、单片机屏幕取模工具和打印系统都能读取，透明区域填充为你选的背景色，多张打包 ZIP，全部在浏览器本地完成。Batch-convert AVIF images to 24-bit BMP bitmaps that almost any legacy software, industrial device, microcontroller display tool or print system can read, with transparent areas filled with your chosen background colour. Download each file or a ZIP; everything runs locally.

如何使用「AVIF 转 BMP」？How do I use the AVIF to BMP Converter tool?

在「AVIF 转 BMP」中，选择或拖入文件，按需设置「透明处背景色」等选项，然后点击「全部下载（ZIP）」按钮即可。In the AVIF to BMP Converter: Choose or drop your files, set "Background for transparency", then click "Download all (ZIP)".

BMP 文件为什么这么大？Why is the BMP file so large?

BMP 不压缩，大小约为 宽 × 高 × 3 字节：一张 4000 × 3000 的照片约 34 MB，而原 AVIF 可能只有几百 KB。只有在设备或软件明确要求 BMP 时才建议使用；平时用 PNG 更省空间且同样无损。BMP is uncompressed, so its size is about width × height × 3 bytes: a 4000 × 3000 photo is about 34 MB, while the AVIF might be a few hundred KB. Use BMP only when a device or program requires it; PNG is just as lossless and much smaller.

AVIF 是什么？为什么有的软件打不开？What is AVIF, and why won't some apps open it?

AVIF 是基于 AV1 编码的新一代图片格式，体积小、画质好，很多网站和手机已经在用；但旧版 Windows 照片查看器、Photoshop 的旧版本、Office 和不少上传表单还不支持。转换后的文件可以在这些软件里正常打开。需要 Chrome、Edge、Firefox 或 Safari 16 以上来解码。AVIF is a newer image format based on AV1 that gives small files with good quality, and many sites and phones already use it — but older Windows photo viewers, older Photoshop versions, Office and many upload forms still don't accept it. The converted file opens normally there. Decoding needs Chrome, Edge, Firefox or Safari 16+.

HDR、动画 AVIF 和 10 位色深会怎样？What about HDR, animated AVIF and 10-bit images?

HDR 和 10/12 位 AVIF 会按浏览器的标准动态范围（sRGB、8 位）输出；动画 AVIF 只转换第一帧，结果中会注明。HDR and 10/12-bit AVIFs are output in the browser's standard dynamic range (sRGB, 8-bit); animated AVIFs convert their first frame only, and the result 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）；透明区域填充为背景色。An uncompressed 24-bit Windows bitmap that almost any software or legacy device can read, but large (width × height × 3 bytes); transparent areas are filled with the background color.

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.

「AVIF 转 BMP」免费吗？需要注册吗？Is the AVIF to BMP Converter free? Do I need an account?

「AVIF 转 BMP」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 AVIF 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.