Question 1

How does the audio converter work?

Accepted Answer

Drop or pick an audio file. We decode it locally with the Web Audio API (decodeAudioData), then re-encode to your selected format. WAV output uses a pure-JS 44-byte RIFF PCM 16-bit encoder. WebM and OGG use the MediaRecorder API. MP3 uses MediaRecorder where supported and gracefully falls back to WAV with a warning toast if not.

Question 2

What output formats are supported?

Accepted Answer

Five formats: WAV (always available, pure-JS encoder), WebM (Chrome/Firefox/Edge), OGG (Firefox), MP3 (where MediaRecorder supports audio/mpeg), and M4A (where supported). Unsupported formats are disabled in the dropdown based on runtime detection.

Question 3

Can I change the bitrate, sample rate, and channels?

Accepted Answer

Yes. 4 bitrate presets (64/128/192/320 kbps for lossy codecs), 6 sample-rate presets (8k/16k/22.05k/44.1k/48k/96k), and mono/stereo channel selection. We render the decoded buffer through an OfflineAudioContext at the target sample rate and channel count, then encode the result.

Question 4

What extra features does this tool have compared to others?

Accepted Answer

(1) Multi-format output (WAV, MP3, WebM, OGG, M4A). (2) 4 bitrate presets. (3) 6 sample-rate presets. (4) Mono/stereo channel selection. (5) Pure-JS WAV header builder. (6) Float32 to 16-bit PCM converter. (7) File-size estimator. (8) Quality score calculator (0-100). (9) Lossless-vs-lossy compatibility checker. (10) Smart filename generator. (11) Conversion history (localStorage, last 20). (12) Shareable URL settings. (13) Drag-and-drop file input. (14) Summary stats (original size, output size, % change, duration).

Question 5

Is my data sent anywhere?

Accepted Answer

No. Audio decoding and encoding all happen locally in your browser via the Web Audio API and MediaRecorder. Your file is never uploaded. Conversion metadata in history is stored in localStorage on this device only.

Audio Converter

Output settings

How to use

Output settings