How to Use Add Audio
- Upload the video file in the first slot — MP4, MKV, MOV, etc.
- Upload the audio file in the second slot — MP3, WAV, AAC, FLAC, or OGG
- Enable 'Loop Video to Match Audio' if the audio is longer than the video and you want the video to repeat
- Click Process to merge the audio into the video and download the result
Features
- Add any audio file to a video as the soundtrack
- Output as MP4, MKV, or MOV
- Option to loop the video to match the full audio length
- 100% private — files never leave your browser
Frequently Asked Questions
- Does this replace the original audio?
- Yes, the new audio file replaces the existing soundtrack entirely. To keep the original audio and mix in additional audio, use our Mix Audio tool instead.
- What if the audio and video are different lengths?
- By default the output length matches the shorter track. If your audio is a full song and the video is shorter, enable 'Loop Video to Match Audio' to repeat the video until the song ends.
- Can I add a voiceover to a video?
- Yes. Record your voiceover as an MP3 or WAV, upload it as the audio file, and the tool will replace the video's soundtrack with your recording.