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You can also convert your files with our powerful desktop app.
3 best methods to convert MP3 to MP4
1. Movavi Video Converter
If you need to convert multiple files or your file is too large for the online converter, try the desktop alternative. The Movavi converter is a versatile audio, video, and image format changer. It deals with over 180 file formats, can convert files in bulk quickly, with high output quality and resolution. Its SuperSpeed mode gives you the fastest conversion speed and no quality loss. It has versions for both Windows PC and Mac and is really lightweight, allowing you to process photos, movies, and music files even on a weak computer.
How to convert MP3 to MP4 fast and easy? Read the guide below to find out!
Step 1. Download and install the Movavi converter
How to use a file converter? First, download the version of the software for Microsoft Windows or Macintosh, launch it, and proceed following the on-screen instructions. When the app is installed to your computer, it will run automatically.
Locate the MP3 files you want to convert and drag-and-drop them into the program’s window. The application can convert big batches of files – there’s no limit to how many files you can transfer at once.
In the Formats menu, select the file type you want to turn your media into and choose the target format for the files. Also, you can change the conversion settings: choose a different bitrate, resolution (including HD, Ultra HD, and even 4K), codec, etc. Pay attention to the SuperSpeed label: it indicates that the conversion will be performed with a very high speed and without losing quality.
To specify the output folder, click the Save to button. Hit the Convert button to launch the process. When the converting is done, the new media files will be saved to the chosen folder.
Now you know how to change the file format using the Movavi converter. WIth this tool, you can also reduce the file size, cut out clips from videos, crop pictures, and create animations from your favorite movies. Get the free trial version and test it out!
Pros:
User-friendly interface that’s simple to navigate
Delivers rapid file conversion speeds
Handles an extensive range of media types
Offers batch processing along with core video-editing tools
Frequently updated, adding improvements and new capabilities
Cons:
Some functions are restricted in the free or trial version
2. VLC
We're all probably familiar with VLC as that orange-cone media player for a PC that you download after the second Windows forgets what an MP4 is. But there's a hidden feature: it does more than play stuff. VLC works quietly as a surprisingly good file converter, including MP3s. Because it's open-source, it plays most video files you can think of – no subscriptions, no paywalls, no "premium codec" nonsense. Just download and go. And unlike a plenty of free software, VLC doesn’t shove banner ads in your face. Sure, the conversion menu feels a bit old-school at first, but once you’ve done it once or twice, it becomes second nature.
Step 1. Install VLC
Download and install the latest version from the official site. Launch the application once installed.
Step 2. Open your MP3 file
Go to Media > Convert/Save, click Add and select the MP3 audio file you want to change.
Step 3. Choose conversion settings
Click Convert/Save. In the Profile dropdown select a format that outputs to MP4 (e.g., Video – H.264 + MP3 (MP4)). In order to modify the profile, if needed, click on the wrench icon: video codec (e.g., H.264), audio codec, resolution, bitrate, etc.
Step 4. Set destination and convert
In the Destination file field click Browse to choose where to save the output and give it a name (e.g., output.mp4). Then click Start. VLC will create an MP4 file from your MP3, adding a video stream (usually blank/black) and the audio track.
Step 5. Check the output
Upon completion, open the resulting MP4 to verify that the audio plays and that the format and quality are acceptable.
Pros:
Free, open-source, and works on all major OS
Supports almost every media format
Simple, familiar interface
Cons:
Limited conversion features compared to other MP3 to MP4 converters
3. CapCut
CapCut has the kind of reputation that precedes it – the go-to app for TikTok creators stitching together viral clips at 2 a.m. But beyond its flashy filters and transitions, it’s also a low-effort way to turn MP3s into MP4s. Drop in your audio, throw on a static image or background color, and voilà – you’ve got a video. The app’s free, lightweight, and mercifully free of pop-up clutter. Even if you’ve never touched a video editor before, CapCut’s layout feels self-explanatory. Give it ten minutes and a song file, and you’ll end up with something that looks slick enough to post anywhere.
Step 1. Install CapCut
Download CapCut and install it on your platform (desktop, mobile or web). Start the app and log-in if needed.
Step 2. Import your MP3 file
Create a new project, then upload the MP3 audio into the media library and add it to the timeline as the primary track.
Step 3. Add a video track or background
Since MP4 requires video + audio, add a simple visual – e.g., a black background clip or image – above or alongside your audio in the timeline. Adjust the duration of the visual track to match your audio length.
Step 4. Set export format to MP4
In export settings choose MP4. Select your desired resolution, bitrate and quality. In the latest version you can choose up to 4K export. Apply any additional tweaks (e.g., transitions, filters, or basic editing) if desired.
Step 5. Export
Click Export and wait for CapCut to render. Once complete, save the MP4 file to your output folder.
Pros:
Clean and intuitive interface, easy for beginners
Lots of free editing tools and templates
Cons:
Many advanced features now require a paid upgrade
Privacy and ownership concerns around content and data rights
What is MP3?
Full name
MPEG-1 Audio Layer III
Format type
Audio
Developed by
Specialists from Fraunhofer Society
Description
The MP3 format was created in 1991, and its specification was published in 1993 as a part of the MPEG-1 standard. Originally, MP3 was made as a proprietary format, but now it is free to use by anyone. MP3 matured into the most widespread audio format in the world. It is probably not possible to find a program that can’t open and play MP3s. But technologies are always developing, and many broadcasting companies now prefer other file types with better compression and less sound quality reduction.
File extension
.mp3
Technical details
MP3 (MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a format for the lossy compression of sound. The quality and size of MP3 files are defined by their bitrate. So, if you’re wondering how to compress your audio files while keeping the quality, consider converting them to MP3 with a bitrate of 192 kbit/s or higher. Then you probably won’t be able to hear any difference in the playback.
Associated programs
Almost any multimedia program
What is MP4?
Full name
MPEG-4 Part 14
Format type
Video
Developed by
Moving Picture Experts Group
Description
MP4 is a format created in 2001 by an ISO/IEC working group. MP4 files are multimedia files used for storing video/audio and other content. Short for “MPEG-4 Part 14,” this file type is very common and recognized by most systems and devices. Check the list below if you’re not sure how to open MP4 files and which programs can play them.
File extension
.mp4
Technical details
MPEG-4 Part 14, also known as ISO/IEC 14496-14:2003, is one instance of a more general standard (ISO/IEC 14496-12:2004) with specifications based on Apple’s QuickTime File Format. The MPEG-4 container uses AAC for encoding audio as a means to restrict data copying via lossy compression and playback. Like its many counterparts, the container supports web streaming.
Associated programs
iTunes, QuickTime Player, Windows Media Player, VLC, RealPlayer, etc.
How to choose the best MP3 to MP4 converter
Picking the right MP3 to MP4 converter really depends on how – and where – you plan to use it.
For those who prefer a free desktop option with more control, VLC stands out – it’s open-source, completely ad-free, and handles nearly every format imaginable. Just be ready to spend a minute learning its interface.
If you deal with lots of audio files and music, go for something that supports unlimited batch conversions and faster performance – Movavi Video Converter is your best bet here. It processes multiple files at once without choking on large audio libraries, keeps quality high, and even offers editing features.
And if you like adding visuals or effects before exporting, CapCut offers a creative edge. It’s a great pick for turning your music into polished, shareable videos without much effort.
And if you want something online, quick, and accessible from any browser, you may want to consider tools like Clideo or Video Candy to get the job done without installs. They’re perfect for light, one-off conversions and support most common file types.
Movavi Video Converter
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