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How to Convert MP3 to MP4 Online for Free [Quick & Easy]

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  • How to Convert MP3 to MP4 Online for Free [Quick & Easy]

Summary: This blog makes a simple comparison between the two: mp3 vs. mp4, what the main differences are. What's more, it tells you how to convert MP3 to M4 in the easiest way.

Have you ever try to share your favorite MP3 file with others on Youtube or Facebook? But those social media sites do not support the uploading of MP3 files. How disappointed it is!

How to solve this problem? Just convert your MP3 file to MP4 format, besides this, you can also add some pictures, video clips, and subtitles to go with your music to make your finally MP4 file next level.

Here in this blog, we're going to share an online free MP3 to MP4 converter for you to convert your MP3 file to MP4. Let's get started!

Also Read: How to Convert M4A to MP4 on PC/Mac for Free >

Part 1 MP3 vs. MP4

Before we get to the topic of converting MP3 to MP4, we want to tell you some information about these two file formats, including what MP3/MP4 is and the main differences between them.

MP3 and MP4 sound familiar, and some people may naturally think that MP4 might be the next level for MP3. However that's not so, they are quite different.

MP3 is short for MPEG (Moving Pictures Experts Group) Layer 3, and it is an audio coding format that adopts lossy data compression. MP3 is widely used for audio storage.

MP4, the acronym for MPEG-4 Part 14, is a digital multimedia container format that is widely used for both audio and video storage. Besides that, it handles other data such as text (subtitles) and images as well.

In short, the biggest difference between them is that MP3 can only store audio, whereas MP4 can store audio, video, and other data such as text and images.

Part 2 How to Convert MP3 to MP4 Online for Free

Want to convert your mp3 to mp4? You may want to do this with some other elements added in your file to flare your project. It's a great idea to add some pictures or video clips to go with the sound; it can help you to catch your listeners', attention. Then you will need an mp3 to mp4 converter to help you handle it easily. We strongly recommend an excellent mp3 to mp4 convert - FlexClip.

Highly Recommended MP3 to MP4 Converter - FlexClip

FlexClip is known as a powerful video maker. Besides that, it is an excellent converter of an MP3 file to MP4. Any files uploaded to FlexClip will be converted to MP4 automatically. Here are the reasons why we recommend FlexClip to help you convert MP3 to MP4.


  • Handy Video Editing. The easy-to-understand interface of FlexClip allows everyone to convert MP3 to MP4, no edit experience is required!
  • Rich Elements. There are various resources built in FlexClip: dynamic text animations, videos, and pictures. You can use them to achieve a far more attractive mp4 file.
  • Professional Editing Tools. FlexClip is equipped with many editing tools to make your video perfect, like video merger, video trimer.
  • Real-Time Preview. Preview your mp4 file while editing in real time. What you see is what you get!

Convert MP3 to Mp4 with FlexClip Quickly and Easily

Here are the detailed steps to convert your mp3 file to mp4 with FlexClip. Follow us and convert MP3 to MP4 in a few minutes.

Step 1 Launch FlexClip and Get Started

Visit FlexClip Homepage with Chrome and sign up for free. Click on Get Started-Free to create a new project.

(Then a new screen will appear asking you to select a video template or start from scratch, here we choose the latter.)

Convert MP3 to MP4 with FlexClip: Start from Scratch

Image Board: Convert MP3 to MP4 with FlexClip: Start from Scratch

Step 2 Upload Your MP3 File

Upload your mp3 file with the music icon on the top left: [ + Add Music] > [ Browse My Files]

Convert MP3 to MP4 with FlexClip: Upload Your MP3 File

Image Board: Convert MP3 to MP4 with FlexClip: Upload Your MP3 File

Step 3 Customize - Add Images or Video Clips, and Subtitles

Add pictures or video clips with the "+" button; add subtitles via the "T" icon on the top left.

Convert MP3 to MP4 with FlexClip: Customize

Image Board: Convert MP3 to MP4 with FlexClip: Customize

NoteRemember to make sure the whole video time is the same as the music file. You can split any video clip that's longer than 3 seconds and trim it as you wish.

Step 4 Preview and Save

Click on the Preview button to preview your work. You can continue editing or save the video to your computer, it will be output by default in mp4 format.

The Bottom Line

That's all for converting mp3 to mp4. You can see how quick and easy it is to convert mp3 to mp4 with FlexClip. Besides converting, FlexClip features many other powerful editing functions: trim video, rotate video, crop video, add watermark to video, adjust audio volume. Give it a try and explore more!

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