How to Convert WebM to MP3 for Free Online & Offline?

User guide on converting WebM to MP3 in WonderFox Free HD Video Converter Factory:

Step 1: Install and Launch the software. Then, select Converter on the main interface.
Step 2: Click + Add Files to import a WebM video file.

Step 3: Click the format image on the right and select Audio > MP3.

Step 4: (Optional) Trim the video to remove unwanted segments and alter the MP3 audio parameter settings.

Step 5: Tap the ▼ icon and specify an output path.
Step 6: Press Run to start the conversion, and it will be done in several seconds.
Tips: You can locate the converted MP3 audio file in the new pop-up window afterward.

The well-known VLC media player can also act as a simple media file converter for Windows and Mac. It provides dozens of profiles for converting video and audio files, including MP3, FLAC, MP4 (H.264 + MP3 or H.265 + MP3), and so forth. Let’s see how to convert WebM to MP3 using the VLC player:

Step 1: Install the program from the VLC official site if your computer doesn’t have one.
Step 2: Open VLC and go to Media > Convert / Save or directly press Ctrl + R to open the “Open Media” window.
Step 3: Click + Add to select a local WebM file and click Open to load it.
Step 4: Tap Convert / Save.

Step 5: Click on the Profile option and select Audio – MP3 from the drop-down list.
Step 6: Tap Browse to create a destination file name and path.
Step 7: Click Start to let VLC convert and save the WebM video to MP3.

Another way to change WebM to MP3 is FFmpeg. It’s a free and open-source project including a suite of libraries and programs for handling video, audio, and other multimedia files. Different from most desktop media converters, FFmpeg uses the command-line tool at its core to convert or edit video/audio files. Here is how to convert WebM to MP3 in FFmpeg:

Step 1: Download FFmpeg on your Windows, Mac, or Linux device. Then, extract the downloaded ffmpeg files and move the ffmpeg.exe to the folder that saves your .webm file.
Step 2: Type “cmd” in the address bar and press Enter.
If you’re running the macOS, open “Terminal” and type “cd desktop”. Then, press the “Return” key.
On Linux, open the terminal or console. (On a few systems, you can open it by pressing Ctrl + Alt + T.)
Step 3: Input this command in the prompt window: ffmpeg -i input.webm -vn output.mp3

Many people want to perform a video or audio conversion with a convenient online tool or website. Thus, this article also offers two easy methods to convert WebM to MP3 online. Processes are simple, yet there is still something worth noting. Read on for the details.

-- CloudConvert
Website: https://cloudconvert.com/webm-to-mp3
Steps: Click “Select File” to add a WebM file > Adjust the optional audio settings > Click “Convert” > Download the converted file.
Note:
× Has a size limit of 1GB for the import file;
× Allows only 25 conversions per day;
× Supports 200+ formats (does not support DAT, ASF, MPV, etc.);
× Internet requirement.

-- Restream
Website: https://restream.io/tools/webm-to-mp3-converter
Steps: Click “Choose File” to import a WebM file > Click “Convert” to begin the conversion > Download the output file.
Note:
× Exports files in MP3, WAV, MP4, and WebM only;
× Allows only 1 conversion at once;
× The max upload time is 15 minutes, you can store up to 3 videos, and the size of each video should not exceed 250MB.
× Internet requirement.