Add Music to Video

Replace a video's audio with a song or voiceover you upload — in your browser.

Select the video

MP4, MOV, WebM

点击选择，或将文件拖到此处

Select the music / audio

MP3, WAV, M4A — replaces the video's sound

点击选择，或将文件拖到此处

如何 Add Music to Video

1
Add the video
Drop in the clip.
2
Add the audio
Drop in a song or voiceover — it replaces the video's own sound.
3
Combine and download
Click Add music; the video plays with the new track and is re-recorded.

Is anything uploaded?+

No. The video and the audio are combined entirely in your browser.

Does it keep the original sound?+

No — the uploaded track replaces the video's audio. To keep both, mix them in an audio editor first.

What if the song is longer than the video?+

It's cut to the video's length. A shorter song leaves silence at the end.

Does it re-encode?+

Yes, in real time (the video's length). Best for short clips.

你们会把我的文件上传到服务器吗？+

不会——这里的每个工具都完全在你的设备上处理文件，不会向服务器上传任何内容。唯一的例外是 AI 工具，它们会把提取的文本（而非文件本身）发送给 Claude 来完成工作。

有文件大小限制吗？+

我们没有人为设置限制，但由于处理过程在你的浏览器中进行，非常大的文件（超过 500MB 或 1000 页）会受到你设备内存的限制，而非我们的限制。