Add Audio to Video
Add music or a voice-over to a video: mix it with the original sound or replace it, set volumes, loop and fade out. Free, in your browser.
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Add music or a voice-over to a video
Put background music on a holiday clip, a voice-over on a tutorial, or clean narration in place of noisy original sound.
How to add audio to a video
- Add the video, or paste a direct link to one.
- Add the music or voice-over — MP3, M4A, WAV, AAC, OGG or FLAC.
- Choose whether to Keep it and mix with the video’s own sound or Replace it, and set the volumes.
- Choose whether to repeat a short track to fill the video and to fade the music out at the end.
- Press Add audio to video, check the result and download the MP4.
Good to know
- The result is always exactly as long as the video: longer music is cut off (with a 3-second fade if you choose), shorter music repeats or stops.
- For music under speech, around 20–40% music volume keeps voices clear.
- The picture is copied untouched when it’s H.264 or HEVC, so the job is quick; other videos are re-encoded as MP4.
- Trim a song first with the Audio Splitter, join several with the Audio Joiner, or record a voice-over with the Voice Recorder.
Everything is processed in your browser with ffmpeg (WebAssembly): neither file is uploaded, and there are no watermarks.
Guides
- How to Add Music to a Video (Mix, Loop and Fade Out)Put background music on a video — keep the original sound underneath or replace it, set both volumes, loop a short song and fade it out. Free, no upload.
- How to Combine Videos on iPhone (No App Needed)Join several iPhone videos into one in Safari — pick them from Photos, set the order, choose vertical or landscape, and save the merged video back to Photos.
- How to Merge Videos into One (Free, Any Format)Join several clips into one MP4 in the order you want — even clips of different sizes, shapes and formats, or without sound. Free, in your browser, no upload.
- How to Make a Slow-Motion Video from Any ClipSlow a video to 0.75×, 0.5× or 0.25× for replays and dramatic moments — and how to film so slow motion stays smooth. Free, in your browser, no app.
Related tools
- Audio ConverterConvert between MP3, WAV, M4A, FLAC, OGG and Opus — batch convert, or take the sound from a video.
- Audio JoinerMerge MP3, WAV and M4A files into one track in any order, with an optional crossfade.
- Audio SplitterSplit MP3, WAV, M4A, FLAC or OGG audio — extract one segment, cut into equal parts, chunk every X seconds, or cut at your own timestamps.
- Audio Noise ReducerRemove hiss, hum and rumble from voice recordings, podcasts and videos, and even out the volume.
- Extract AudioSave the sound of any video as an MP3, M4A or WAV file.
- Change VolumeMake a video louder (up to 300%) or quieter, or even out its sound.