How to Convert WebM to MP3 on Mac
WebM audio usually comes from browser recordings and screen or voice recorders on the web. Drop your WebM below to save it as an MP3 – and trim it on the waveform first if you like. It all happens on your Mac.
Drop an audio file here
MP3, WAV, M4A, OGG, FLAC… · nothing is uploaded
Trimmed on your device. Your audio is never uploaded.
Step by step: Convert WebM to MP3 on Mac
- 1
Open this page in Safari, Chrome or Firefox on your Mac.
- 2
Drag the file from Finder onto the box above, or click the box to choose it.
- 3
The whole file is selected by default. Drag the handles on the waveform only if you want to cut it.
- 4
Choose MP3 as the format (it's already selected), then download. Click Download. The file is saved to your Downloads folder (Finder › Downloads, or the dock).
What changes when you convert WebM to MP3
- The MP3 is encoded at 192 kbps – indistinguishable from the original for most listening, at about 1.4 MB per minute.
About WebM and MP3
- WebM audio usually comes from browser recordings and screen or voice recorders on the web. Phones and editing apps often refuse it.
- MP3 is the audio format every phone, car stereo, speaker, editor and website accepts. It's lossy, so files are small.
Tips for Mac
- Works on Apple silicon and Intel Macs alike – nothing to download from the App Store.
- The file is decoded by your browser's built-in audio support. If one browser can't open it, try Chrome or Firefox.
WebM vs MP3
| WebM | MP3 | |
|---|---|---|
| Compression | Lossy (Opus or Vorbis) | Lossy |
| Best for | Recording in the browser | Music, ringtones and anything you need to play anywhere |
| Support | Chrome and Firefox; limited elsewhere | Universal |
Frequently asked questions
Does converting WebM to MP3 reduce quality?
Slightly, as MP3 is lossy, but at 192 kbps it's very hard to hear any difference.
Can I cut the audio at the same time?
Yes. Drag the start and end handles on the waveform, preview it, and add a fade in or out if you want.
Is my audio uploaded to a server?
No. The conversion runs in your browser using your device's own processor, so your audio never leaves your device. You can even disconnect from the internet once the page has loaded.
Where does the converted file go on my Mac?
Click Download. The file is saved to your Downloads folder (Finder › Downloads, or the dock).
Need more options? Open the full Audio Trimmer tool →