Is the recording uploaded?

No. The MediaRecorder API runs entirely in your browser. The file stays in memory until you download it.

It's the format browsers can record into without extra encoding libraries. You can convert it to MP3 later with a separate tool.

Files never leave your device

Online Audio Recorder

Record audio from your microphone using the browser MediaRecorder API. Listen back, then download as a WebM or OGG file.

00:00