Add Audio to Video Free — Replace Sound Track Online

Adding custom audio to video is essential for content creators. Replace noisy original audio with clean voiceover, add background music to silent screen recordings, or swap the soundtrack entirely. With 5,700 monthly searches, this is a frequent need that usually requires downloading editing software.

MiOffice adds audio to video in your browser using FFmpeg WebAssembly. Upload a video and an audio file, click process, and download. No software install, no server upload.

How to Add Audio to Video

1. 1

   Open the Add Audio Tool

   Go to the add audio to video tool.

2. 2

   Upload Video + Audio

   Upload your video file (MP4, MOV, AVI, WebM, MKV) and your audio file (MP3, WAV, M4A, AAC, OGG, FLAC).

3. 3

   Download Combined Video

   Click process. Your video with the new audio track downloads as MP4.

Common Workflows

Related Workflow

• --Want to remove audio first? Use Mute Video to strip the original audio.
• --Need to extract audio from another video? Use Video to MP3.
• --Trim your audio to the right length with MP3 Cutter.
• --Normalize volume levels with Audio Normalizer.

Privacy

Both your video and audio files are processed locally in your browser. No files are uploaded to any server. FFmpeg WebAssembly handles the entire operation on your device.