Free tool · no install · works on your phone
Add music to video online — free audio replacer & mixer
Drop a clip and an audio file: replace the original sound with your track, or mix the music under the existing audio. The music trims to the video's length automatically — no timeline math.
Preview free · download moves the result into your free Aperture library · 100 MB per file · first 60 s processed
How to add music online
- Drop a video into card ① and an audio file into card ②.
- Pick replace (music only) or mix (music under the original).
- Press Add music and listen to the result.
Why add music with Aperture
- Replace or mix — your call
- Music auto-trims to the video length
- AAC 192k output keeps the score clean
- Free preview, no watermark
FAQ
Replace or mix — which do I want?
Replace when the original audio is unusable; mix when you want commentary or ambience under the music.
What if the music is longer than the video?
It's trimmed to the video length automatically — the video length always wins.
Can I control the music volume in a mix?
The free mix is balanced 50/50. For ducking and level automation, claim both files and use the editor's audio lanes.
More free tools
Need the full studio? Open the Aperture editor — timeline, transcript search, guest review, platform exports — free plan included.