🖼️ WebP 转 AVIFWebP to AVIF Converter
把 WebP 图片批量转换为 AVIF：在同等画质下通常比 WebP 再小 20–30%，保留透明，可调质量、编码速度或选择无损，多张打包 ZIP，图片只在浏览器本地编码，不会上传。Batch-convert WebP images to AVIF, which is often another 20–30% smaller than WebP at the same quality, keeping transparency, with adjustable quality, encoder speed or lossless mode. Download each file or a ZIP; images are encoded only in your browser.
使用说明与常见问题How-to & FAQ
「WebP 转 AVIF」是什么？What is the WebP to AVIF Converter tool?
把 WebP 图片批量转换为 AVIF：在同等画质下通常比 WebP 再小 20–30%，保留透明，可调质量、编码速度或选择无损，多张打包 ZIP，图片只在浏览器本地编码，不会上传。Batch-convert WebP images to AVIF, which is often another 20–30% smaller than WebP at the same quality, keeping transparency, with adjustable quality, encoder speed or lossless mode. Download each file or a ZIP; images are encoded only in your browser.
如何使用「WebP 转 AVIF」？How do I use the WebP to AVIF Converter tool?
在「WebP 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 WebP to AVIF Converter: Choose or drop your files, set "Quality", "Encoder speed", then click "Download all (ZIP)".
WebP 转 AVIF 一定会更小吗？Will AVIF always be smaller than the WebP?
大多数照片会更小，但 WebP 本身已经是有损压缩，再编码一次不会恢复细节，质量设得太高反而可能比原文件大；建议从质量 60 开始比较。动图 WebP 只转换第一帧（此编码器不输出动画 AVIF）。Most photos get smaller, but the WebP is already lossy: re-encoding cannot restore detail, and a very high quality can even make the file bigger, so start at quality 60 and compare. Animated WebPs convert their first frame only (this encoder does not write animated AVIF).
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.
「WebP 转 AVIF」免费吗？需要注册吗？Is the WebP to AVIF Converter free? Do I need an account?
「WebP 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 WebP 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.