🖼️ JPG 转 AVIFJPG to AVIF Converter
把 JPG/JPEG 照片批量转换为 AVIF：同等画质下体积通常只有 JPG 的一半左右，适合网站提速和节省存储，可调质量、编码速度，多张打包 ZIP，照片只在浏览器本地编码，不会上传。Batch-convert JPG/JPEG photos to AVIF — often around half the size of the JPG at the same visual quality, great for faster websites and saving storage — with adjustable quality and encoder speed. Download each file or a ZIP; photos are encoded only in your browser.
使用说明与常见问题How-to & FAQ
「JPG 转 AVIF」是什么？What is the JPG to AVIF Converter tool?
把 JPG/JPEG 照片批量转换为 AVIF：同等画质下体积通常只有 JPG 的一半左右，适合网站提速和节省存储，可调质量、编码速度，多张打包 ZIP，照片只在浏览器本地编码，不会上传。Batch-convert JPG/JPEG photos to AVIF — often around half the size of the JPG at the same visual quality, great for faster websites and saving storage — with adjustable quality and encoder speed. Download each file or a ZIP; photos are encoded only in your browser.
如何使用「JPG 转 AVIF」？How do I use the JPG to AVIF Converter tool?
在「JPG 转 AVIF」中，选择或拖入文件，按需设置「质量」、「编码速度」等选项，然后点击「全部下载（ZIP）」按钮即可。In the JPG to AVIF Converter: Choose or drop your files, set "Quality", "Encoder speed", then click "Download all (ZIP)".
JPG 转 AVIF 能省多少空间？画质会变差吗？How much space does JPG to AVIF save, and is quality lost?
照片在质量 50–60 时通常比原 JPG 小 40–60%，具体取决于内容（细节越多省得越少）。JPG 已经是有损压缩，转成 AVIF 是再编码一次，细节不会恢复；质量 75 以上一般看不出差别。照片方向（EXIF 旋转）会按浏览器显示的方向写入，EXIF 本身不保留。Photos at quality 50–60 are usually 40–60% smaller than the original JPG, depending on content (more detail saves less). The JPG is already lossy and AVIF re-encodes it, so detail is not restored; quality 75+ usually looks the same. Orientation (EXIF rotation) is applied as the browser shows it, but EXIF itself is not kept.
AVIF 有什么好处？质量和速度怎么选？Why AVIF, and how do I set quality and speed?
AVIF 基于 AV1 视频编码，同等画质下通常比 JPG 小一半左右、也比 WebP 更小，并支持透明。质量 60 是兼顾体积和画质的常用值，80 以上肉眼几乎无损；“编码速度”越慢文件越小，但大图可能要十几秒。勾选“无损”会按 4:4:4 无损编码，像素完全不变，但文件往往比 PNG 小不了多少。AVIF is based on the AV1 video codec: at the same visual quality it is often around half the size of JPG and smaller than WebP, with transparency support. Quality 60 is a common balance of size and quality and 80+ looks lossless to most eyes; slower encoder speeds give smaller files but large images can take 10+ seconds. Lossless encodes 4:4:4 with every pixel unchanged, though the file is often not much smaller than PNG.
编码在哪里进行？第一次为什么慢？Where does encoding happen, and why is the first run slow?
浏览器的 Canvas 不能直接导出 AVIF，所以本工具在后台线程（Web Worker）中运行开源编码器 libavif + libaom（WebAssembly，来自 jSquash，Apache-2.0 / BSD 许可）。编码组件约 3.5 MB，第一次转换时下载，之后由浏览器缓存；图片始终只在本机处理，不会上传。单张最多 4,000 万像素。Browser Canvas cannot export AVIF, so the tool runs the open-source libavif + libaom encoder (WebAssembly, from jSquash, Apache-2.0 / BSD licensed) in a background Web Worker. The encoder is about 3.5 MB and downloads on first use, then stays in the browser cache; images are only processed on your device and never uploaded. Each image can be up to 40 megapixels.
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.
「JPG 转 AVIF」免费吗？需要注册吗？Is the JPG to AVIF Converter free? Do I need an account?
「JPG 转 AVIF」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 JPG to AVIF 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.