Add Audio to Video Online
Add music, narration, or sound effects to a video. Position multiple audio tracks, adjust their playback range, source offset, volume and fade, then download a mixed result.
Online editor to add audio to video
Upload a video and one or more audio files. Place each track on the video timeline, choose which part of the source audio to use, adjust volume and fade, and decide whether to keep the video's original audio.
How to Add Audio to a Video
The tool mixes uploaded audio with one video. Each track has its own position on the video timeline, source offset, volume, and fade setting. You can keep the original soundtrack or turn it off before processing.
Step-by-step
- Upload or drag and drop a video file.
- Add one or more music, narration, or sound-effect files.
- Select a track and set its start, end, and source offset.
- Adjust volume and fade; keep or mute the original video audio.
- Preview the mix, process it, and review the downloaded result.
What you can control
- Timeline start/end: where the track is heard in the video.
- Source offset: where to begin inside the audio file.
- Volume: the selected track's mix level.
- Fade: a fade-in/out duration for the selected track.
- Original audio: keep it in the mix or remove it.
Music, Voiceover, and Sound Effects
Background music can establish mood and support pacing, but it should not overpower speech. Start with a lower music volume when the original video contains dialogue or when you add narration.
Voiceover can explain a tutorial, presentation, product demonstration, or silent recording. Short sound effects work best when their timeline position matches the visible action. Use preview as a guide, then review the processed download for final synchronization.
Popular use cases
- Add background music beneath existing dialogue.
- Add narration to a tutorial or screen recording.
- Replace the video's original soundtrack.
- Place short sound effects at specific moments.
- Combine ambience, music, and voice in separate tracks.
Avoid clipping and an overcrowded mix
Several loud tracks playing together can distort or mask speech. Lower individual track volumes, use fades at abrupt entrances and exits, and check the loudest overlapping section before export.
How Audio Timing Works
Track start and end describe the portion of the video timeline where an uploaded sound should play. Audio source offset skips the beginning of that audio file. For example, a track starting at 10 seconds with a 5-second source offset begins at the fifth second of the audio when the video reaches 10 seconds.
If an audio file is shorter than its selected timeline range, it does not automatically become a loop. Use Loop Video only for video repetition; for repeated music or more complex audio arrangements, use the full editor and verify the finished mix.
Add Audio, Remove Audio, Extract Audio, or Use the Full Editor?
Add Audio to Video
Mix one or more uploaded audio tracks with a single video.
Remove Audio
Create a silent video without adding a replacement soundtrack.
Extract Audio
Save the existing soundtrack as a separate audio file.
Full Video Editor
Edit clips and audio together, arrange a more complex mix, and add text or subtitles.
Supported Video and Audio Files
The video uploader accepts common formats including MP4, MOV, AVI, WebM, and MKV. The audio picker accepts browser-recognized audio files. Actual preview and processing support can depend on the codecs inside each file, so test the processed download before publishing.
Learn More About Adding Audio to Video
Frequently Asked Questions
Answers to common questions about adding music, sound, and voiceovers to video.
How do I add audio to a video?
Upload a video, add one or more audio files, position each track on the timeline, adjust its settings, preview the mix, and process the result.
Can I add music to a video online?
Yes. Upload a music file, choose where it starts and ends in the video, adjust its volume, and decide whether to keep the original soundtrack.
Can I replace the original audio in a video?
Yes. Turn off “Keep original video audio” and add the replacement audio tracks you want in the processed result.
Can I add multiple audio tracks to one video?
Yes. You can add multiple audio tracks and control when each one plays in the video.
What audio formats are supported?
The picker accepts browser-recognized audio files. Codec support can vary even within common containers, so confirm that the file previews and processes correctly.
Can I sync audio with video timing?
Yes. Set track start/end on the video timeline and use source offset to choose where playback begins inside the uploaded audio file.
Can I control the volume of each audio track?
Yes. Select a track and change its volume independently. Preview overlapping tracks carefully to avoid masking speech or creating an overly loud mix.
Does the tool automatically loop short audio?
No automatic audio looping is promised. Choose a suitable track range and review the processed result; use the full editor for more complex repeated arrangements.