How to Replace Audio in a Video: Change BGM, Voiceover, Or Any Audio Track

Have you ever experienced that you captured a fantastic video, but the audio that comes with the video doesn't come out just the way you want it to be? Or you might've thought the background music of your video doesn't fit well? Then you might look for a way to replace the audio track or change the music in the video.

You've come to th right place! This post guides you on how to replace audio track in a video for free in different ways: simply change the background music with a new one, replace the original audio track with your own voiceover narration, and even how to use an ai voice to replace the original sound. Keep reading and learn how to do it without requiring any skill.

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How to Replace Audio in a Video Online for Free

We have just a great online tool to help you remove and replace the audio track in a video. It works completely online, so you don't have to download and install any software on your device.

As a powerful online video editor, available both on Mac and Windows, FlexClip can work as a video audio replacer helping you replace audio in a video for free. Here are different options for you to replace the audio in a video: add a new music track from FlexClip's music library or upload your own one, record your own voice-over with its easy voice recorder, and even generate a cool ai voice using its advanced ai text to speech tool.

Here, we'll introduce the 3 audio-replace options separately below, you can choose any method your need or try all of them to find your desired one:

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Method 1 Replace the Audio in a Video with a New Music Track

Not satisfied with the bgm of your video? You can easily change the music to a new one at FlexClip in clicks. You can upload your desired song to replace the music or simply search one from FlexClip's music library.

Step 1

Access FlexClip and upload the video you want to replace the audio from your PC, phone, Google Drive, One Drive or Dropbox, etc., then click the plus icon to add it to the timeline and you may trim or split it when needed.

Replace the Audio in a Video with a New Music Track - Upload

Step 2

Go to the timeline, and right-click on the video > select Detach Audio > then FlexClip will automatically extract the audio from the video, and you should see a separate audio track below the video track on the timeline. Meanwhile, an extra extracted audio in WAV format will also be saved to your PC for backup.

Replace the Audio in a Video with a New Music Track - Detach Audio

Step 3

Now, you can select the audio track on the timeline and delete it for adding a new one. Here you can upload your own song or pick one from FlexClip's audio library.

Replace the Audio in a Video with a New Music Track - Change Music to a New One

Step 4

Once you changed the music to your desired one, you can trim it, adjust its volume and add apply fade in/out effect to make it perfect your video.

Replace the Audio in a Video with a New Music Track - Edit Music

Method 2 Replace the Audio in a Video with Your Voice-over

Besides change the background music of your video to a new one, you can also record your own voice-over for your video narration and replace the original sound.

Step 1

Upload your video, detach and delete the original audio in your video as we did above.

Step 2

Then go to the Media part, find the Record Voice button and click it to record your voice. Here, you can choose the Devices that you want to record and mute other audio tracks while recording, and then click the red button to start recording after a 3-second countdown.

Replace the Audio in a Video with Your Voice Over - Record Voice

Step 3

Once finished, just click the red button again to stop recording. Then your voice will be added to the video, and you will get a copy and can save it to your computer (mav format).

Replace the Audio in a Video with Your Voice Over - Add Voice

Step 4

Finally, you can edit your voiceover like music as we introduced in method 1.

Replace the Audio in a Video with Your Voice Over - Edit Voice

Method 3 Replace the Audio in a Video with an AI Voice

Are you shy to use your own voice to replace the audio in the video, you can even try FlexClip's smart ai text to speech tool to generate an ai voice for your video. Check the steps below to learn how to use an ai voice to replace the audio track in a video.

Step 1

Also, upload your video, detach and delete the original audio in the video first.

Step 2

Then find the Text to Speech button on the Media part, and click it.

Step 3

Then you can choose a language, voice, voice style, etc. Once done, just type in the texts for your ai voiceover, then you can preview the voice effect, if you're satisfied, simply hit the Save to Media button to save the voice track to Media.

Replace the Audio in a Video with AI Voice - Generate Voice

Step 4

Go to the Media, find realistic AI voices and click the plus icon to add it to the video, and you can adjust the audio narration's volume or trim or split the audio or even apply a fade in/out effect.

Replace the Audio in a Video with AI Voice - Edit AI Voice

Sandy /

Has 4-year of professional photographing experience. Very much into recording every detail of life. She is passionate about all things related to video production, and loves to exploring tips and tricks about it.