The basic steps work the same way in every video editor

Adding audio to video means placing a sound file on top of your existing video track. Most editors let you do this by dragging an audio file into a separate audio lane below your video, then adjusting when it plays and how loud it is. The original sound from your video stays unless you mute it — so you end up with two audio sources playing at once, which is why you usually turn one down.

The process takes the same shape whether you are using free software like DaVinci Resolve or paid tools like Adobe Premiere Pro. You import the audio file, place it on the timeline, trim it to fit your video length, and adjust the volume so both sounds work together. The main difference between tools is how many clicks it takes and where the buttons live.

Key Takeaways

  • Audio files go on a separate track below your video track, and you control when each sound starts and stops independently.
  • Your original video sound stays unless you actively mute it, so you will usually lower its volume to make room for the new audio.
  • Most editors let you drag audio files directly onto the timeline, but some require you to import them to a library first.
  • Fade-in and fade-out effects on audio prevent jarring jumps between silence and full volume.

Import your audio file into the editor

Before you can add audio to your timeline, the editor needs to know the file exists. In DaVinci Resolve, go to File > Import Media and select your audio file from your computer. In Adobe Premiere Pro, use File > Import and choose the audio. In CapCut (the mobile and desktop version), tap the plus icon and select Audio, then choose your file.

Some editors create a media library or bin where imported files live until you drag them onto the timeline. Others let you drag directly from your file browser. Either way, the audio file now exists in the editor's workspace and is ready to place on your timeline.

Drag the audio onto a new track below your video

Once the audio is imported, find the timeline at the bottom of your screen — this is where your video clip sits. Look for a plus icon or right-click in the empty space below your video track to create a new audio track. Drag your audio file from the library or media bin onto this new track.

The audio will snap to wherever you drop it. If you want it to start at the beginning of your video, drop it at the left edge of the timeline. If you want it to start partway through, drop it further to the right. You can always move it later by clicking and dragging it left or right along the track.

Adjust the length so audio and video end together

Your audio file probably has a different length than your video. If the audio is longer, it will keep playing after your video ends. If it is shorter, there will be silence at the end. Trim the audio by hovering over the right edge of the audio clip on the timeline until you see a resize cursor, then drag left to shorten it or right to extend it (if the file is longer than the visible timeline).

Most editors show you the audio as a waveform — a visual representation of the sound that gets taller where the audio is louder. This helps you see where the important parts are. If you want the audio to end exactly when the video ends, drag the right edge of the audio clip to line up with the right edge of the video clip.

Lower the volume of your original video sound

Your video probably has its own audio — dialogue, background noise, or ambient sound recorded when you filmed it. With both the original audio and your new audio playing at full volume, the result will be muddy and hard to understand. Click on your video track to select it, then look for a volume slider or audio level control. Drag it down to around 30 to 50 percent so the original sound is still there but does not overpower the new audio.

If you want to remove the original sound entirely instead of lowering it, right-click on the video clip and select Mute Audio or Disable Audio. This is useful if you are adding a voiceover or music that should be the only sound.

Add fade-in and fade-out to avoid harsh volume jumps

When audio starts at full volume with no warning, it sounds jarring. The same happens when it cuts off suddenly. Most editors let you add a fade effect by right-clicking on the audio clip and selecting Fade In or Fade Out, or by dragging a small handle at the corner of the audio clip on the timeline. A fade-in gradually raises the volume from silence over the first second or two. A fade-out does the opposite at the end.

You can control how long the fade lasts — a one-second fade is usually noticeable but not slow, while a three-second fade is gentler. Experiment by playing back your video and listening to where the audio feels abrupt, then add fades to those spots.

Preview and export your final video

Click the play button on your timeline to hear how the audio and video work together. Listen for places where one sound is too loud, where the timing feels off, or where you want a fade that is not there yet. Make adjustments by moving audio clips, changing volume levels, or adding more fades.

Once you are happy with how it sounds, export your video. In DaVinci Resolve, go to File > Export and choose your format. In Adobe Premiere Pro, use File > Export > Media. In CapCut, tap Export and select your quality. The editor will combine your video track, original audio, and new audio into a single file with all the changes you made.

Frequently Asked Questions

Can I add multiple audio tracks at the same time?

Yes. Create multiple audio tracks and drag different files onto each one. You can control the volume of each track separately, so you might have music on one track, voiceover on another, and sound effects on a third. This is how professional videos are built.

What audio file formats do editors accept?

Most editors accept MP3, WAV, and AAC files. Some also support FLAC, OGG, and M4A. If your audio file is in a format the editor does not recognize, you can convert it using free tools like Audacity or online converters before importing it.

How do I sync audio to a specific moment in the video?

Drag the audio clip left or right on the timeline until it lines up with the moment you want. Most editors show a vertical line at your playhead position — click where you want the audio to start, then drag the audio clip so its beginning aligns with that line.

What if my audio is out of sync by just a few frames?

Click on the audio clip to select it, then use your keyboard arrow keys to nudge it left or right one frame at a time. This gives you precise control without having to drag and guess. Play back frequently to hear when it lines up correctly.

Can I adjust the volume of just one part of the audio clip?

Yes, by adding keyframes. Click on the audio clip, find the volume line running through it, and click at the point where you want the volume to change. Drag that point up or down to raise or lower the volume from that moment forward. This lets you make one section quieter without affecting the rest.