Looking for an MP3 to WebM Converter?

Convert MP3 to WebM online!

Change MP3 to WebM online for free in a few simple steps. To convert multiple files, download Movavi Video Converter.

Convert to
Edited by Ben Jacklin
11 816

WebM is a file format that can contain video and audio. The format is mainly used for playing files in web browsers. If you need to convert MP3 to WebM, you’ve come to the right place! Here, you can convert MP3 to WebM online using the free tool at the top of this page. Online conversion is a good choice if you have one small file to convert. If you want to convert multiple files, use Movavi’s MP3-to-WebM converter. Read on to learn how to convert MP3 to WebM with Movavi Video Converter. You’ll also find a comparison between MP3 and WebM.

How to convert large MP3s to WebM on Windows or Mac with Movavi

Movavi Video Converter is an MP3-to-WebM converter with a free download. The app lets you change file formats in just a few clicks. It allows you to convert several files simultaneously. Converting MP3 to WebM with Movavi Video Converter is fast thanks to the SuperSpeed technology. The interface is simple, so you won’t have to spend much time learning to navigate the app.

Download the installation file for Windows or Mac: the MP3-to-WebM converter is available for both platforms. Follow the guide below to convert MP3 files to WebM.

Step 1. Install and run the app

Run the downloaded file to install the app. Launch the converter.

Step 2. Add files to the program

Go to Add Media and select the Add audio option. Select the MP3s you want to convert.

Step 3. Choose the output format

Open the Video tab, pick WebM, and select the preset you need.

Step 4. Convert .mp3 to .webm

Click Save to and select the folder where you want to save the output files. To change MP3 to WebM, hit Convert.

MP3 vs. WebM: A comparison

This MP3 vs. WebM comparison table shows the main differences between the formats.

Comparison parameter



Format type

Audio format

Video format

Developed by

Fraunhofer Society

On2, Xiph, and Matroska; later Google

File extension



Here’s what Movavi Content Team does to provide you with only verified information:

  • When selecting products to include in our reviews, we research both demand and popularity.

  • All the products covered in this article have been tested by our team.

  • When testing, we compare key characteristics, including supported input and output formats, quality loss when converting, and other significant features.

  • We study user reviews from popular review platforms and make use of this information when writing our product reviews.

  • We collect feedback from our users and analyze their opinions of Movavi software as well as products from other companies.

Frequently asked questions

How do I use FFmpeg for MP3-to-WebM conversion?

  1. Install FFmpeg on your computer.
    Download FFmpeg

  2. Place your MP3 file in the folder where you keep FFmpeg.

  3. Hold Shift and right-click inside the folder. Select Open command or PowerShell window here.

  4. In Command Prompt, type the following: ffmpeg -i filename.mp3 filename.webm In PowerShell, type: .\ffmpeg -i filename.mp3 filename.webm

  5. Replace filename with the real name of your audio file.

  6. Press Enter.

How do I convert MP3 to WebM with VLC?

Follow the steps below to convert MP3 to WebM in VLC.

  1. Install VLC on your PC or Mac.
    Get VLC

  2. Go to the Media menu and select Convert/Save.

  3. Click Add and pick the file you want to convert. Hit Convert/Save.

  4. In the Profile field, hit the wrench icon and select Webm. Click Save.

  5. Click Browse and indicate the folder where you want to save the file. Type the name of your file ending with .webm.

  6. Hit Start.

How do I add MP3 audio to a WebM video?

To add an audio track to a WebM video, use Movavi Video Editor.

  1. Download and install the program on your computer.
    Movavi Video Editor

  2. Open the app and click Add Files. Select your WebM video and MP3 audio.

  3. Drag the files onto the timeline.

  4. Make sure the video and audio are the same lengths. You can trim the files or copy them.

  5. Click Export, select the format you need, and hit Start.

Have questions?

Have questions?

If you can’t find the answer to your question, please feel free to contact our Support Team.

Join for how-to guides, speсial offers, and app tips!