Add Sound to Video

Add or replace the audio of a video with any sound file

VIDEO

AUDIO

Free Add Audio to Video — Replace or Mix Sound in Videos Online

ezyimg's Add Sound to Video tool lets you replace or mix the audio track of any video with a separate audio file. Use it to add background music, replace original sound, or mix two audio tracks together — all processed locally in your browser with no uploads.

How to Use

  1. 1

    Upload your video

    Drop an MP4, MOV, WebM, or other video file into the VIDEO drop zone.

  2. 2

    Upload your audio

    Drop an MP3, WAV, OGG, or other audio file into the AUDIO drop zone.

  3. 3

    Choose replace or mix

    Check 'Replace original audio' to discard the video's existing audio and use only the new track. Uncheck to mix both audio tracks together.

  4. 4

    Loop audio (optional)

    Check 'Loop audio' if the audio file is shorter than the video — it will repeat until the video ends.

  5. 5

    Process and download

    Click Add Audio. The audio is merged with the video and the result is downloaded as MP4.

Tips & Best Practices

  • →Enable Loop Audio for background music that's shorter than your video.
  • →Replace mode is best for dubbing a new voiceover or adding a completely different soundtrack.
  • →Mix mode lets you keep original sounds while layering in background music.
  • →The video track is copied without re-encoding (fast and lossless for the video quality).
  • →Audio is re-encoded as AAC for maximum compatibility in the output MP4.

Frequently Asked Questions

How do I add music to a video online for free?

Upload your video and music file to ezyimg's Add Sound to Video tool, choose replace or mix mode, and click Add Audio. The music is merged with the video and exported as an MP4 file.

How do I replace audio in a video?

Upload your video and the new audio file. Check 'Replace original audio' to discard the original sound track and use only the new audio. This is useful for dubbing, voiceovers, or adding background music.

Can I mix two audio tracks in a video?

Yes. Uncheck 'Replace original audio' to mix the new audio with the existing video audio. Both tracks play simultaneously at equal volume.

What if the music is shorter than the video?

Check 'Loop audio' — the audio file will repeat in a loop until the video ends.

What audio formats can I add to a video?

The tool accepts MP3, WAV, OGG, FLAC, M4A, and other audio formats. The output is always MP4 with AAC audio.