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MP4 转 WebM

MP4 转 WebM

在浏览器中运行 · 无需上传

此工具及本页说明目前仍为英文。功能完全相同：一切都在你的浏览器中运行。

Drag & drop an MP4 video here

or

MP4 or M4V videos · converted to WebM

Your files stay on your device. Nothing is uploaded.

  • 任何内容都不会离开你的设备
  • 服务器不限制文件大小
  • 无需注册，无水印
  • 免费

How to convert MP4 to WebM

  1. Choose your MP4 video.
  2. The output is set to WebM; choose the quality used if the video has to be re-encoded.
  3. Press Convert and download the WebM file.

Good to know

  • The video is re-encoded to VP9 (or VP8) and the sound to Opus.
  • When the video and sound can be copied into the new format as they are, they are not re-encoded: no quality loss, and very fast.
  • Best in current Chrome and Edge; recent Safari and Firefox work too.

Your videos stay on your device

Everything happens in your browser. Your videos are never uploaded, and this site's security policy blocks the page from sending files anywhere.

常见问题

Is there a size limit?

No server-imposed file size limits. The practical limit is your device's memory: several gigabytes work on most computers.

Are my videos uploaded?

No. They are converted in your browser and never sent anywhere.