1
Choose Your Video
Choose the WebM file from your downloads or recordings folder, or drop it on the page.
WebM to MP3 Converter
Turn WebM screen recordings, webcam clips and browser audio into MP3. The WebM file is converted on your device and never uploaded.
Files stay on your device
Drop your WebM here, or choose a file
Converts WebM video or audio to MP3 at 128 to 320 kbps. It stays on your device.
Choose a fileYour browser converts the file. Nothing is sent to a server.
- No signup, no watermark
- No upload size limit
- About 2 sec for a 47 sec clip
- Works offline once loaded
How to Convert WebM to MP3
2
Pick Quality and Trim
Pick an MP3 bitrate. 128 kbps is plenty for a narrated screen recording; use 192 kbps or more for music.
3
Convert and Download
Press Convert to MP3, check the preview, and download.
What Is a WebM File?
WebM is an open video format released by Google in 2010. It holds VP8, VP9 or AV1 video with Opus or Vorbis audio, and it is what Chrome produces when a website records your screen, camera or microphone.
That is why so many screen recorders, online voice recorders and meeting tools hand you a .webm file. Browsers play it, but many phones, car stereos and editors do not.
| WebM | MP3 | |
|---|---|---|
| Made by | Google, 2010, open and royalty-free | Fraunhofer and MPEG, 1993 |
| Audio codec | Opus or Vorbis | MP3 |
| Common source | Browser screen, webcam and voice recorders | Music, podcasts, audio apps |
| Plays on | Browsers, VLC, newer Android | Every device and app |
Why Convert WebM to MP3
Open It Anywhere
iPhones, car stereos, WhatsApp and many audio editors do not open WebM. MP3 opens everywhere.
Keep the Narration
Save the voice from a recorded lesson, demo or call as a small MP3 to send or transcribe.
Fix "Unsupported Format"
A downloaded voice clip that ends in .webm becomes a normal audio file you can play and edit.
Audio-Only WebM Files
Some online voice recorders save sound only, still with a .webm ending. Those convert the same way: drop the file, pick a bitrate, and download the MP3.
WebM audio is usually Opus, which sounds good at low bitrates. For speech, 128 kbps MP3 keeps it clear; there is little point going higher.
WebM to MP3: Frequently Asked Questions
Why is my recording a WebM file?
Chrome and other browsers record screen, camera and microphone in WebM, so tools that record in the browser save .webm files.
Can I convert an audio-only WebM to MP3?
Yes. WebM files with only sound convert the same way as WebM video.
Is my WebM file uploaded to a server?
No. Your browser reads the WebM file and writes the MP3 on your own device. Nothing is sent to MP4toMP3.io or anyone else, and the page keeps working with Wi-Fi off once it has loaded.
Does WebM to MP3 work on iPhone?
Safari on recent iPhones reads most WebM files. If a file does not open on the phone, convert it on a computer in Chrome, Edge or Firefox.
Which bitrate should I use for a screen recording?
128 kbps is enough for speech. Use 192 kbps if the recording has music you care about.
Ready to Convert WebM to MP3?
Choose a file at the top. It is free, private and done in your browser in a few seconds.
Convert now