Browser edition: files stay on your device. Up to 100 MB total and 10 minutes. First use downloads a 32 MB engine. Some formats depend on codec support. Public-link downloading is not ready on this free deployment.
Convert WebM to MP3
Convert WebM to MP3 online for free. Extract the audio track at the bitrate you choose.
How to convert WebM to MP3
- Add your fileDrop it on the page, choose it from your device, or paste it with Ctrl+V.
- ConvertAdjust settings if you like, then press the button. You'll see live progress.
- Browser processing uses original files on your device. Public-link downloading is unavailable.
What happens to your file
WebM files are common for website video, HTML5 players, transparent overlays, but not every app or device opens them. MP3 is ideal for music libraries, podcasts, car stereos, any device. Spool converts WebM to MP3 with FFmpeg — real decoding and encoding, not a renamed file extension.
Audio only. Spool drops the video stream and keeps the soundtrack. The audio is encoded to MP3 at the bitrate you choose (192 kbps by default). Tags such as title and artist are carried over when present.
Settings
- Audio bitrate — 320 kbps · best, 256 kbps, 192 kbps · standard, 128 kbps · small, 96 kbps, 64 kbps · voice
- Channels — Original, Mono
- Sample rate — Original, 48 kHz, 44.1 kHz, 22 kHz
WebM vs MP3
| WebM | MP3 | |
|---|---|---|
| Full name | WebM | MPEG-1 Audio Layer III |
| Created by | Google, 2010 | Fraunhofer IIS / MPEG, 1993 |
| Type | Video container | Lossy audio |
| Typical contents | VP8, VP9 or AV1 video with Opus or Vorbis audio | MP3 (lossy) |
| Best for | website video, HTML5 players, transparent overlays | music libraries, podcasts, car stereos, any device |
| Strength | Royalty-free and built for the web | Universal compatibility |
| Weakness | Weak support in older Apple software and many video editors | Lossy: some detail is discarded |
About WebM
- Type
- WebM
- Contains
- VP8, VP9 or AV1 video with Opus or Vorbis audio
- Use
- website video, HTML5 players, transparent overlays
About MP3
- Type
- MPEG-1 Audio Layer III
- Contains
- MP3 (lossy)
- Use
- music libraries, podcasts, car stereos, any device
FAQ
What bitrate should I choose for MP3?
192 kbps is a good default for music. Choose 320 kbps for the best quality, 128 kbps for podcasts and voice, 64 kbps for small voice notes.
Can I convert several WebM files at once?
Yes. Drop up to 10 files at a time — each one is converted in parallel and you can download them individually or all at once.
Is there a file size limit?
Convert and edit files on your device. The browser edition accepts up to 100 MB total, media up to 10 minutes and video up to 4K. Codec availability and device memory can limit individual jobs.
Is this WebM to MP3 converter free and safe?
Yes. There are no pop-ups, redirects or fake download buttons, and no software to install. Files are transferred over HTTPS, processed in isolated job folders and deleted automatically.