MP3 to MP4 Converter

Convert MP3 files to MP4 online for free now.

*Tips: To learn more, please click how to compress video files with ease >>

online convert mp3 to mp4

How to Convert MP3 to MP4 Online?

Step 1

Upload MP3 File

Drag and drop the MP3 files that you want to convert.

Step 2

Convert MP3 to MP4

Click CONVERT to convert your MP3 file(s).

Step 3

Download Converted MP4

Click DOWNLOAD to save your converted MP4 file(s).

Information about MP3 and MP4 File Formats

File Extension
MP3 is a widely-used audio format with a .mp3 file extension, developed by the Moving Picture Experts Group and based on MPEG-1 and MPEG-2 standards. It uses lossy data compression, which can decrease quality over time, but it remains the most popular choice for websites and multimedia players.
Associated Programs
Windows Media Player
iTunes, Mplayer
VLC Media Player
Developed By
Moving Picture Experts Group
Useful Link
File Extension
MP4 (MPEG-4 Part 14) is a video container format based on QuickTime MOV. But unlike MOV, it adds support for other MPEG features. MP4 supports video (MPEG-4 Part 2 and MPEG-4 Part 10/H.264), audio (MP3, AAC, SLS, TTSI, and ALAC), and subtitles (MPEG-4 timed text). It’s this codec combination that gives MP4 its flexibility.
Associated Programs
Windows Media Player
VLC Media Player, Apple QuickTime Player
Developed By
International Organization for Standardization
Useful Link

Why Choose to Convert Files?

Watermark and Ads Free

Online UniConverter is a free online video & audio converter, which never adds watermarks or ads to the converted videos.

Support Multiple Formats

Online UniConverter supports a list of video/audio formats, including MP4, MOV, MKV, WAV, and Android/iPhone compatible formats.

Browser Compatible

Online UniConverter also works with Google Chrome, Safari, Firefox, and your smartphones without limitation.

High Quality Output

The converted files will keep the quality as higher as original, and you can download or save to Dropbox easily.

Privacy and Safety

We keep your information secure all the time. All uploaded files will be deleted from the server after 24 hours.

Easy to Use

We provide clear guide and steps for online conversions. It's easy to use for beginners.

Convert Your Files Online in Seconds.

A feature-packed online program, trusted by millions.
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MP3 to MP4 conversion quality rating:
4.6 (162,357 Votes)
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We’ve already converted xxx ,xxx ,xxx files with a total size of 10,124 TB