Audio Converter

Open almost any audio file and export it as MP3, WAV, or a native format your browser can encode (OGG/Opus, WebM, or M4A where supported) — no uploads, no plugins.

How to use the Audio Converter

Add your audioDrop a file onto the page or tap to browse — or press “try a built-in sample” to explore first. Nothing is uploaded; the file is decoded on your device.
Choose the outputPick MP3, WAV, OGG Opus or M4A, then a bitrate or bit depth; optionally change sample rate or channels.
Convert and previewPress Convert & preview — the file is really encoded and decoded again, so you hear the real result and see its true size.
DownloadPick MP3 or WAV and press Download. You can even listen to the exact file you just saved before you close the page.

About the Audio Converter

The Audio Converter changes audio between MP3, WAV, FLAC, OGG (Opus) and M4A (AAC) entirely in your browser. It reads MP3, WAV, M4A/AAC, OGG, Opus, FLAC and more — whatever your browser can decode — and writes the format you choose.

Where other converters upload your file and make you wait, this one processes locally, previews the encoded output (including codec artefacts at low bitrates) and shows the exact final file size before you download.

How the Audio Converter works

Decoding uses the browser’s native codecs at the file’s own sample rate. Encoding: WAV is written directly (16/24-bit PCM with optional TPDF dither, or 32-bit float); MP3 uses a LAME-based encoder at constant bitrate, with sample-rate and bitrate snapped to values the MP3 standard allows; OGG Opus and M4A AAC use your browser’s built-in encoder through the MediaRecorder API, which runs at real-time speed. After a lossy encode the result is decoded again so the preview and file size are the real thing.

What people use it for

Device compatibility

Make files play on any phone, car or editor.

Smaller files

Turn WAV into MP3/Opus.

Editing

Turn compressed audio into WAV.

Archiving

Choose the right format for storage.

Tips for the best results

Convert from the best source you have — lossy to lossy loses quality twice.
MP3 192 kbps ≈ transparent for most; Opus 96 kbps is excellent.
Mono halves the size for speech.
Use the batch converter for many files.

Common problems & fixes

My format is not supportedBrowsers decode what their codecs allow; try Chrome or Edge.

OGG or M4A creation is unavailableThat depends on browser encoders — MP3 and WAV always work.

Quick facts

Input	MP3, WAV, M4A/AAC, OGG, Opus, FLAC, WebM, AIFF… (browser-dependent)
Output	MP3 (CBR 32–320 kbps) · WAV 16/24/32f · FLAC 16/24-bit · OGG/WebM Opus · M4A AAC
Options	Sample rate, mono/stereo
Preview	Real encoded output

Frequently asked questions

Which format should I choose?

MP3 for compatibility, WAV for editing, Opus for the smallest good-quality files, M4A for Apple devices.

Is there a file size limit?

Only your device’s memory.

Why do some formats take longer than others?

MP3 and WAV are encoded directly and finish almost instantly. Other formats (OGG/Opus, WebM, M4A) are produced using your browser's own built-in recorder, which works in real time — so a 4-minute file takes about 4 minutes for those formats specifically.

Why don't I see every format listed here?

The list only shows formats your specific browser can actually encode, detected automatically. Chrome and Firefox generally offer the most options; Safari's set differs.

Can this convert to FLAC or AAC?

Not yet — those need a dedicated encoder that isn't wired up in this build. MP3, WAV, OGG/Opus and WebM are fully supported today.

Your audio never leaves your device

This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.

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