Add music to video

How it works

1. 1

   Add video and music

   Drop your video, then pick the audio track (MP3, WAV, M4A…). Both stay on your device.

2. 2

   Replace or mix

   Swap the soundtrack entirely, or layer the music under the original sound with separate volumes.

3. 3

   Download

   The picture is copied untouched, so it's fast.

Replacing a soundtrack, or mixing under one

These are two genuinely different edits and the wrong one is a common mistake. Replacing discards the original audio entirely and is what you want for silent footage, a slideshow, or a clip whose sound is unusable. Mixing keeps the original underneath the music, which is what you want whenever anybody in the video is talking, because music laid over speech at full volume does not sit behind it, it buries it.

When you mix, the balance is the whole job. Background music under speech wants to be well below it, and the instinct to push it up because it sounds nice on its own is the single most reliable way to make a video hard to watch. Starting with the original at full and the music noticeably quieter, then adjusting by ear, gets you there faster than starting from an even split.

Length rarely matches. A track shorter than the video can be looped to cover it, and a track longer than the video is cut to fit, which means the music will stop rather than resolve. If the ending matters, fade the result out instead of letting the song hit a wall at the final frame.

Add music to video without uploading either file

The video and the audio track are both read from your own disk and mixed on your own machine. Two files, neither uploaded, no size limit on either, and no watermark or audio tag on what comes out.

MP3, WAV, M4A, OGG, and FLAC all work as the music source, so a track can be used in whatever form you already have it, without a conversion step first.

For a slideshow, build the video from your photos first and then bring it here for the soundtrack. To take the original audio out entirely rather than mix under it, the muter does that in one step, and the fade tool will smooth the ending once the music is in place.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

Can I keep the original sound and add music underneath?

Yes, choose "Mix them" and set the music quieter (60% original / 100% music is a good start for background music).

What if the song is shorter than the video?

Tick "Repeat the track" and it loops seamlessly to cover the whole video. Music longer than the video is always cut to fit.

Which audio formats work?

MP3, WAV, M4A/AAC, OGG, FLAC, anything your browser can read.

Does this re-encode my video?

No. Only the audio is rebuilt; the video stream is copied bit-for-bit, so quality is untouched and processing is quick.

Do my files get uploaded?

No. Everything happens in your browser; your files never leave your device.

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