🖼️ BMP 转 PNGBMP to PNG Converter
把 BMP 图片批量转换为 PNG：拖入多张图片一键转换，无损保存、保留透明，可打包下载 ZIP，图片只在浏览器本地处理，不会上传。Convert BMP images to PNG in bulk — drop in several files, saved losslessly with transparency kept, and download them individually or as a ZIP. Images are processed locally and never uploaded.
使用说明与常见问题How-to & FAQ
「BMP 转 PNG」是什么？What is the BMP to PNG Converter tool?
把 BMP 图片批量转换为 PNG：拖入多张图片一键转换，无损保存、保留透明，可打包下载 ZIP，图片只在浏览器本地处理，不会上传。Convert BMP images to PNG in bulk — drop in several files, saved losslessly with transparency kept, and download them individually or as a ZIP. Images are processed locally and never uploaded.
如何使用「BMP 转 PNG」？How do I use the BMP to PNG Converter tool?
在「BMP 转 PNG」中，点击「全部下载（ZIP）」按钮即可。支持拖放文件。In the BMP to PNG Converter: Click "Download all (ZIP)". Drag-and-drop files is supported.
转成 PNG 文件会变大吗？Will the PNG be bigger?
可能会。PNG 是无损格式，照片转成 PNG 往往比 JPG/WebP 大好几倍，但不会再损失画质，适合需要继续编辑或需要透明背景的图片。Often, yes. PNG is lossless, so photos are usually several times larger than JPG/WebP, but no further quality is lost — good for images you will keep editing or that need transparency.
图片会上传到服务器吗？Are my images uploaded?
不会。解码和编码都用浏览器的 Canvas 在本地完成，文件不会离开你的设备；照片中的 EXIF 元数据（包括位置）会被去除。No. Decoding and encoding happen locally with the browser's Canvas, so files never leave your device; EXIF metadata (including location) is removed.
「BMP 转 PNG」免费吗？需要注册吗？Is the BMP to PNG Converter free? Do I need an account?
「BMP 转 PNG」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 BMP to PNG 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.