Voice Recorder — Free Browser Mic
Record voice memos or short audio clips with live waveform feedback. Get back a clean mono 16kHz or 24kHz WAV, the original capture, and a metadata JSON sidecar (scenario, speaker, task type) — built for ASR/TTS dataset work as well as quick memos.
How to record voice memos in your browser
- Grant mic permission. Click Record — browser will prompt for microphone access. Grant once, remembered next time.
- Watch the waveform. Live waveform shows your input. Speak at normal volume — keep the peaks below clipping.
- Pause and resume. Click Pause to take a break. Click Record again to continue the same recording.
- Download your outputs. Click Stop, then download the mono WAV (16k or 24k, your choice before recording), the original capture, and the metadata.json sidecar.
Use Cases
Frequently Asked Questions
Is my audio uploaded?
No. Recording happens entirely in your browser. Audio never leaves your device unless you choose to share the file.
What is the max recording length?
Limited by browser memory. 30+ minutes works on most laptops; for hour-long recordings prefer desktop apps.
Why mono WAV instead of stereo or MP3?
Mono 16-bit PCM WAV is the standard input format for ASR/TTS pipelines and keeps the recording lossless. The tool also keeps your original capture (typically WebM/Opus) if you need the raw file.
Does it work on mobile?
Yes on iOS Safari 14+ and Android Chrome. Mic permission prompt appears on first use.
What's in the metadata JSON sidecar?
Recording timestamp, scenario, target use, speaker label, task type, duration, sample rate, and file sizes for both the WAV and the original capture — editable before you record.
Why does the recording sound quiet?
Your mic input gain may be low. Check System Preferences / Sound settings to boost input volume.
Why mono 16kHz WAV — and what the original capture actually is
This recorder captures raw audio through the browser's MediaRecorder API (typically WebM/Opus, sometimes MP4/AAC depending on browser), then decodes and re-renders it to mono PCM WAV at your chosen sample rate. The two outputs serve different purposes.
| Output | Format | Typical size (1 min mono voice) | Best for |
|---|---|---|---|
| Mono WAV (16 kHz) | Uncompressed 16-bit PCM | ~1.9 MB | ASR pipelines, transcription, archival |
| Mono WAV (24 kHz) | Uncompressed 16-bit PCM | ~2.9 MB | TTS training data |
| Original capture | WebM/Opus (or MP4/AAC), browser-dependent | ~0.5–1 MB | Keeping the raw take, or feeding into your own re-encoder |
- 16 kHz is the standard sample rate for speech-recognition (ASR) models; 24 kHz is more common for text-to-speech (TTS) training data — pick based on what you're feeding the recording into.
- The original capture's exact codec depends on what your browser's MediaRecorder supports (WebM/Opus is preferred where available) — it is not converted to MP3.
Related tools
More free, in-browser tools from the Video & Audio set — every one runs locally, with no sign-up and no upload.