🚫 移除 WebP AlphaRemove WebP Alpha Channel
去掉透明度：把图片按所选底色（默认白色）合成后导出不透明 WebP。本地处理。Remove transparency: flatten the image onto the chosen backdrop colour (white by default) and export an opaque WebP. Processed locally.
使用说明与常见问题How-to & FAQ
「移除 WebP Alpha」是什么？What is the Remove WebP Alpha Channel tool?
去掉透明度：把图片按所选底色（默认白色）合成后导出不透明 WebP。本地处理。Remove transparency: flatten the image onto the chosen backdrop colour (white by default) and export an opaque WebP. Processed locally.
如何使用「移除 WebP Alpha」？How do I use the Remove WebP Alpha Channel tool?
在「移除 WebP Alpha」中，选择或拖入文件，按需设置「底色」等选项，然后点击每个结果旁的「下载」按钮即可；有多个文件时也可以点「全部下载（ZIP）」一次打包下载。In the Remove WebP Alpha Channel: Choose or drop your files, set "Backdrop", then click the Download button next to each result (with several files, "Download all (ZIP)" saves them together).
为什么只导出 WebP？Why does it only export WebP?
本页是 WebP 系列工具之一：读入图片后在你选的底色上重绘，让透明部分变成不透明，再按 WebP 格式导出，便于在 WebP 工作流里直接使用。需要 PNG 或 JPG 结果时，请用对应的通用图片工具。This page is one of the WebP tools: it loads the image, redraws it on the background colour you choose so transparent areas become opaque, and exports the result as WebP so it fits straight into a WebP workflow. For PNG or JPG output, use the matching general image tool.
会上传吗？Uploaded?
不会，图片只在浏览器本地处理。No. Processed locally in your browser.
底色怎么合成？How is the backdrop applied?
每个像素按自身透明度与所选底色混合（结果 = 颜色 × α + 底色 × (1 − α)），完全不透明的像素保持不变，导出的 WebP 没有透明通道。无损输入会按无损导出，像素与计算结果完全一致。Each pixel is blended with the chosen backdrop by its own opacity (result = colour × α + backdrop × (1 − α)); fully opaque pixels are unchanged and the exported WebP has no transparency. A lossless input is exported lossless, exactly as computed.
有哪些选项可以调整？What options can I adjust?
「移除 WebP Alpha」的设置：「底色」默认 #ffffff；可选文件：常见图片格式（含 HEIC、HEIF、AVIF、WEBP、BMP、JFIF）。每次生成结果都按当前设置处理。Settings in the Remove WebP Alpha Channel — "Backdrop" default #ffffff; files: common image formats (including HEIC, HEIF, AVIF, WEBP, BMP, JFIF). The result always uses the current settings.
「移除 WebP Alpha」免费吗？需要注册吗？Is the Remove WebP Alpha Channel free? Do I need an account?
「移除 WebP Alpha」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 Remove WebP Alpha Channel is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.