How to Add/Combine Audio or MP3 to MP4 Video on Any Device

Audio editing is common nowadays for optimizing audio and video effects. Adding audio to video files is one of the ways that makes video content engaging, emotional, and informative. The audio component can be a voiceover for narration, dialogue to tell a story, or background music and sound effects to enhance the atmosphere and emotional impact, thereby capturing viewer attention and maintaining interest. Most people insert attractive music into videos to make impressive content and share them on social media. In this article, we will show you how to add audio to MP4 files to get stunning video effects.

Method 1: Add Audio to MP4 Without Re-encoding

AnyMP4 Video Converter Ultimate is a powerful video and audio editor software that can help you add any audio track to video files. It allows you to import MP4 and many other video formats into the software. Then, you can import multiple audio tracks to the MP4 video without re-encoding. All popular lossless and lossy audio formats, including AAC, M4A, MP3, FLAC, etc., are supported. Moreover, for adding audio to MP4, it offers a simple and straightforward solution.

Follow the steps to add audio to MP4 here.

1. Install and run the audio to MP4 program on your computer. Navigate to the Converter tab. Click Add Files to add your MP4 file.

2. Choose Add Audio Track option from the drop-down list of AAC-2Channel. Then, you can add a new audio track in .mp3, .aac, .ac3, aiff, etc., for the MP4 file.

Note: If you need, you can add more than one audio track to your MP4 file.

3. Click Edit now from the pop-up to enter the audio editing window. You can adjust the volume, set the delay effect, or change the audio track here. Then, click OK.

4. Finally, click Convert All on the main interface.

Now, you combine MP4 with audio successfully. Besides adding audio tracks, you can also add subtitles to MP4.

AnyMP4 Video Converter Ultimate is one of the best apps for adding music to video files. It performs well in adding multiple audio files to the videos to provide you with the better viewing experience. The process is fast and the video quality can be maintained in a good way. The software offers a free trial and have a try!

Method 2: Add Multiple Audio Tracks (Advanced Editing)

DaVinci Resolve is an all-in-one program that combines professional audio postproduction, editing, color correction, visual effects, and motion graphics. That means you can edit video and audio together like a pro. It supports various formats, like MP4, MOV, MP3, WAV, AAC, MKV, etc. You can try this tool if you want to add AC3 or WAV audio to MP4. Moreover, it also supports you to adjust the audio tracks using shortcuts.

1. Download DaVinci Resolve on your desktop. Add your MP4 video to Project first.

2. Click File to select Import File, then click Import Media to import an audio file. Or, you can use the shortcut CTRL+I to add it quickly.

3. After importing, pull the audio to the Timeline. You can add a second audio track to MP4 to MP4 by following the same steps.

4. Export the MP4 video with one or more audio tracks.

Davinci Resolve is a well-known video editing software that is excellent for adding music to videos. It is ideal for voiceovers, multilingual tracks, and layered sound design. Some beginners would think the interface is complex. You need to spend some time to learn how to use it. Besides, it is heavy on CPU/GPU, which can cause lag when working.

Method 3: Add MP3 to MP4 with Free Tools

1. Best Tool to Add 2nd Audio Track to MP4 - VLC Media Player

VLC is a free and open-source media player that available for macOS, Windows, and Linux. Besides the basic playing feature, it is also designed with some editing and recording functions. It enables you to add an MP3 audio to MP4 video file with ease. You can free install VLC from its official site and then take the following guide to add audio to MP4 with it.

1. Open VLC Media Player, click Media on the top menu bar, choose the Open Multiple Files option from drop-down list. Click Add button to load your video in the Open Media window.

2. Tick the Show more options checkbox and then tick Play another media synchronously.

3. Click Browse button to arise the Open Media window. Here you can click on Add and then the Select button to add the audio track you want to insert to this video.

4. Click the Convert/Save or Play drop-down button in the bottom right corner and choose the Convert option. Then you will be taken to the Convert window. You can click on the Browse button under the Destination section to select a location for the edited video file. Ensure you get a suitable output format, and then click Start button to add audio to MP4.

Many people try VLC because it is free and open source. For adding audio to MP4, it supports MP3, AAC, FLAC, AC-3, etc., which can meet your different needs. It also includes an equalizer, filters, pitch/speed adjustments, and noise removal for simple tweaks. The limitation is that precisely syncing and polishing voiceovers is difficult on it.

2. Fade Audio and MP4 Video Smoothly - iMovie

iMovie is a built-in iOS and macOS application. If you want to add audio to MP4, it is your perfect option on Mac. It can turn your videos with audio into magic movies. Moreover, it supports fading audio as you like. Besides, its intuitive interface is user-friendly for beginners to edit videos and audio.

Here is about how to combine audio and MP4 video files on iMovie.

1. Open iMovie on Mac. Drag the MP4 file into the iMovie project window. Then, drag it to the Timeline.

2. Click Import Media to add an audio file. Position the audio on the Timeline at the desired starting point by dragging it left or right.

3. Click the File menu and select Share. Then, click Next to choose a save location. Finally, click Save

iMovie has a built-in voiceover recording feature that allows you to record narration directly in it, which is ideal for content creators. Besides, it allows stacking multiple audio clips (music, effects, narration) in the timeline for basic layered sound design. It also has many features for you to fade, trim, and sync audio files. However, while you can layer audio, the number of tracks and flexibility is limited compared to professional editors.

Method 4: Add Music to MP4 Online

1. Add Audio to MP4 Video Online - Clideo

To add audio to MP4 file directly on your web browser like Chrome, IE, Firefox, or Safari, you can rely on some online audio to video adding tool like Clideo. It has a separate Add Music to Video page for you to quickly add audio to MP4 video for sharing on YouTube, Facebook, Instagram, TikTok, or another social media. Clideo supports all the common formats like MP4, WMV, VOB, AVI, MP3, WMA, OGG, WAV, and more. You can follow the steps below to add audio to MP4 video online.

1. Go to the Clideo Add Music to Video site on your browser. When you get there, click Choose file button to select and upload your MP4 video. As you can see, it also allows you to edit a file from Google Drive or Dropbox. The max file size of your uploaded video is limited to 500MB.

2. It will take really long time to complete the MP4 uploading. After that, you can click Add audio to browse and add an audio file to this video. The new added audio track will be listed under the video clip.

3. You are allowed to trim the added audio and adjust volume based on your need. Moreover, you can select another format for this edited video. Click Export button in the bottom right to start adding audio to MP4 file.

Clideo is designed for beginners, with a clear drag-and-drop interface. You can easily add audio files to the MP4. It is secure that your files can only be accessed through your account. The other side of simplicity is the lack of advanced features, which is restricted for some people.

2. Add Music to MP4 Online - Kapwing

Kapwing is a free online video editor used to create media files. It can help you to add background music, sound effects, and audio to MP4 or other videos. Meanwhile, it allows you to drag and drop any audio file or paste a URL from YouTube, TikTok, etc. Besides adding audio tracks, it also can customize subtitles and elements.

Read the steps to add MP3 audio to MP4 video online.

1. Access the Kapwing video editor and add your MP4 video to it. Pull it to the Timeline.

2. Open the Audio tab on the left panel. Add an audio track or paste an audio link to upload to the media library. Then, drag and drop the audio to Timeline.

3. Finally, click Export project.

Kapwing provides multiple ways to add audio: you can upload audio files, paste a URL, record directly, and use its built-in audio library, which is the best choice for content creators to add popular audio to their MP4 files. Moreover, it allows adding more than one track, so you can combine narration, music, and effects with ease. The shortcoming is that it requires a stable net connection.

FAQs

Conclusion

Want to add audio to MP4 without re-encoding? Here in this post, you can learn 6 effective methods to add a new audio track or background music to video. For more questions, you can leave us a message.