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

點擊選擇，或將檔案拖曳至此

Select the music / audio

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

點擊選擇，或將檔案拖曳至此

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.

你們會把我的檔案上傳到伺服器嗎？+

不會——這裡的每個工具都完全在你的裝置上處理檔案，不會向伺服器上傳任何內容。唯一的例外是 AI 工具，它們會把擷取的文字（而非檔案本身）傳送給 Claude 來完成工作。

有檔案大小限制嗎？+

我們沒有人為設下限制，但由於處理過程在你的瀏覽器中進行，非常大的檔案（超過 500MB 或 1000 頁）會受你裝置記憶體的限制，而非我們的限制。