FREE AUDIO TOOL
Replace Audio in Video
Swap a video's audio track for a voiceover, song, or any other audio. The video stays exactly as-is, all in your browser.
Swap a video's audio track for a different one, such as a voiceover or a song. The video stream is kept exactly as-is.
Drop the video here or click to choose
Drop the new audio track here or click to choose
Why Use Our Replace Audio in Video?
Swap the Soundtrack
Replace a video's existing audio with a voiceover, a song, or a cleaned-up recording, in one step.
Video Stream Untouched
The video is copied without re-encoding, so the picture quality stays exactly the same as the original.
Any Audio Source
Bring your own MP3, WAV, M4A, or other audio file to lay over the video.
Automatically Matched
The output is trimmed to the shorter of the video or audio, so the result lines up cleanly.
100% Private
Your files are never uploaded. Everything is combined locally in your browser using a WebAssembly build of FFmpeg.
Free and Fast
No sign-up, no watermark. Get an MP4 with your new audio track in seconds.
Frequently Asked Questions
How do I replace a video's audio?
Drop in the video and the new audio track, then click Replace Audio. You get an MP4 with the original picture and your new soundtrack.
Does it re-encode the video?
No. The video stream is copied as-is, so there is no loss of picture quality and the process is fast.
What audio files can I use?
MP3, WAV, M4A, AAC, and other common audio formats all work as the replacement track.
What if the audio and video are different lengths?
The output is trimmed to the shorter of the two, so the result lines up cleanly without a long silent tail.
Is anything uploaded to a server?
No. The files are combined locally in your browser using a WebAssembly build of FFmpeg and never leave your device.
Is this tool free?
Yes. It is free to use with no account and no watermark.
More Tools