Audio Recorder

What the Audio Recorder Does

The Audio Recorder captures sound from your microphone directly in the browser, with a live input level meter, a running timer, and pause and resume controls. Finished recordings appear immediately with an inline player, so you can check a take before downloading it. Nothing is uploaded: capture, compression, and playback all happen on your device with the MediaRecorder API.

It is useful for quick voice memos, podcast scratch tracks, pronunciation practice, meeting notes, music ideas, and any situation where installing a recording app is more friction than it is worth.

How to Record Audio

1. Press Enable microphone and allow the browser's permission prompt.
2. Pick your input device from the microphone dropdown if you have more than one.
3. Watch the level meter while you speak, and adjust your distance so the meter stays mostly in the green.
4. Press Start Recording. Use Pause and Resume to hold mid-session without splitting the file.
5. Press Stop to finish. The recording appears on the right, ready to preview or download.

Each recording stays available in the list until you delete it or close the page, so you can capture several takes and compare them before deciding which one to keep.

Understanding the Level Meter

The meter is driven by an AnalyserNode that measures the loudness of the live input signal. Green segments mean the level is healthy, yellow means you are getting close to the ceiling, and red means peaks may clip. Because the meter responds to the raw microphone input, it also works as a quick check that the right device is selected: if it stays flat while you speak, switch to another microphone in the dropdown.

Output Format and File Size

Recordings are compressed with the Opus codec inside a WebM container, the combination with the widest browser support and the best quality per byte. Opus records cleanly at roughly 128 kbps, which keeps file sizes small:

\[ \text{size} \approx \frac{\text{bitrate} \times \text{duration}}{8} \]

That works out to about 1 MB per minute of audio. A ten minute interview is around 10 MB, small enough to email or upload later. If a browser cannot record Opus in WebM, the tool falls back to the next supported format, such as audio/mp4 on Safari, and labels the download accordingly.

How Long Can a Recording Be?

There is no fixed time limit, but recordings are held in memory, so practical length depends on your device. On a typical laptop you can record well over an hour; on a phone, aim for shorter sessions or download recordings between takes. Nothing is stored after you close the page, so download anything you want to keep.

Privacy and Permissions

The browser asks for microphone permission the first time you press the enable button, and the permission can be revoked at any time from the browser's site settings. Audio is captured and encoded locally, and the recording exists only in your browser tab until you download it. Nothing is sent to a server, and there is no account, tracking, or cloud storage involved.

Related Audio Tools

• Audio Equalizer shapes the tone of a recording with a six-band EQ.
• Audio Merger joins several takes into a single track.
• Audio Splitter cuts a long recording into shorter segments.
• Audio to WAV Converter converts a WebM recording to WAV for editing.
• Screen Recorder captures your screen with optional audio.
• Camera Recorder records video and audio from your webcam.