Add Music to Video
Add music to a video for free — drop in a video and an MP3 or other audio file, then replace the original sound or mix the two with separate volume controls. Choose where the music starts, loop it to fill the video and fade it out at the end. The video itself is copied without re-encoding, so quality is untouched. Runs privately in your browser.
100% private — everything is made on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Set “Original sound” above 0 to mix the music with the video’s own audio (e.g. voice-over under music).
Videos are made by your browser with its built-in encoders (WebCodecs) and the open-source Mediabunny library — your photos, videos and music are never uploaded. Works best in recent Chrome, Edge and Safari.
How to add music to a video
- Drop your video in the box.
- Add your music or audio file.
- Set the music volume, original sound level, start point, loop and fade.
- Click Add music, preview and download the MP4.
What you can use it for
- Add background music to travel videos and vlogs
- Put a soundtrack under product and promo videos
- Replace noisy audio with music
- Mix a voice-over with quiet background music
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See all free image tools →Frequently asked questions
How do I put music on a video?
Drop the video in, add the audio file, and click Add music. By default the original sound is replaced; raise “Original sound” to mix them.
Does the video lose quality?
No — the video stream is copied as-is; only the audio is new.
What if the song is shorter or longer than the video?
Longer songs are cut to the video's length (with a fade-out). Shorter songs loop if “Loop music” is ticked.
Can I use any song?
Only use music you have the rights to. For social media, use the platform's licensed music library or royalty-free tracks.
Is my video uploaded?
No. The video is read and encoded by your own browser using its built-in video encoders, so it never leaves your device — even large or private videos stay private.