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Add Audio to MP4

Merge voiceover, music, SFX to your MP4 video with maximum flexibility

Upload an MP4
Add Audio to MP4
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Why Add Audio to MP4 with FlexClip

Based on Browser

Based on Browser

Farewell to giant, CPU-burning video editors. FlexClip helps you insert all sorts of audio files into your MP4 video right in your browser. No download, no installation needed.

Popular Formats Supported

Popular Formats Supported

FlexClip supports nearly all mainstream audio formats, including MP3, AAC, M4A, FLAC, OGG, WAV. In other words, you can add audio to your MP4, no matter what format it is in.

Top Security

Top Security

Your privacy is our top concern. We guarantee that your personal information and all files you upload will not be shared with any third parties.

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Add Audio to MP4 with Great Ease

FlexClip is devoted to providing fast, responsive, and easy merging experience. To merge audio tracks with an MP4, all you need to do is uploading all media resources, and then dragging to seamlessly align the audio and MP4 tracks. The whole process takes less than 1 minute.

Add Audio to MP4
Add Audio to MP4 with Great Ease

Get Royalty-Free Music Tracks

FlexClip is integrated with resources from Storyblocks and Pexels. You have access to millions of royalty-free music, sound effects in different styles. Search the music you love with a keyword and add it to your MP4 video in just one click.

Royalty-Free Audio Tracks
Get Royalty-Free Music Tracks

Play With Your Audio Files

Seamless audio/video alignment doesn’t mean a great output. FlexClip understands that and offers you advanced tools to achieve perfection. You can mix multiple audio tracks into one MP4 on the easy timeline, adjust audio volume, remove audio background noise with the power of AI, etc. Play with your audio files as you wish.

Edit Audio Tracks
Play With Your Audio Files

How to Put Audio into an MP4 Video

  1. 1

    Upload Resources

    Go to the Media section, upload your MP4 video, and your audio tracks from a local folder, or cloud service.

  2. 2

    Edit the Audio

    Apply audio and video to the timeline. Drag the slider to trim the audio, or click on the audio track to access all audio editing tools like removing background noise, fade-in/out effect, duplicate.

  3. 3

    Export & Share

    Click on Export. You can export your MP4 to a local folder, generate a short link, save to cloud services, or post to social media directly.

How to Put Audio into an MP4 Video

FAQs

How do I remove or replace the audio in an MP4?

To remove or replace audio in an MP4, you can just use the Mute option, or manually detach the original audio from the MP4, remove it, and then add a new audio file.

Will adding audio to an MP4 change its quality?

Adding audio to an MP4 file shouldn’t degrade the video quality, as long as you are exporting the video in its original resolution. However, if the audio file is of low quality, it might affect the overall sound experience of the final video.

Can I loop audio in an MP4 video?

Yes, FlexClip allows you to duplicate audio, or directly loop the audio throughout the entire MP4 video.

Can I adjust the speed of the audio in an MP4?

Yes, take FlexClip as an example, once you select one audio track, the audio speed adjustment tool will pop up above the timeline. You can easily speed up or slow down the audio to match the video’s pacing.

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