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Convert MP4 to WebM
Convert MP4 to WebM for smaller, web-native video on your own website.
无需登录文件保持私密
将文件拖放到此处或点击浏览
MP4, WebM, MOV, AVI, MKV, Video 无文件大小限制
你的文件永远不会离开你的设备。所有处理都在你的浏览器中本地进行。
WebM tips
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WebM (VP9) is the web-native format — it tends to be smaller than H.264 MP4 at the same quality, ideal for self-hosted web video.
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Pair a WebM source with an MP4 fallback in your <video> tag so every browser, including iOS Safari, has something to play.
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VP9 encodes slowly in the browser. For long HD clips, expect a wait — it's doing real encoding on your CPU.
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Encoding happens locally, so unreleased web assets never leave your machine.
工作原理
1
选择文件
Drop your file into the tool above. It stays entirely on your device — nothing is sent to any server.
2
处理
The tool processes your data instantly in your browser using JavaScript. No server, no waiting.
3
下载
Get your result instantly. Nothing is stored after you leave the page — complete privacy.
为什么选择我们的？
✓完全免费——永远没有隐藏费用
✓无需账号、邮箱或登录
✓文件永远不会离开你的设备
✓绝无文件大小限制
✓所有输出均无水印