Convert MP3 to WAV and WAV to MP3

Converting audio normally means handing your file to a website that uploads it, converts it on a server, and keeps it for as long as it likes. This does the whole job on your machine: the file is decoded, re-encoded and handed straight back, with no upload and no account. Go from MP3 to WAV when you need an uncompressed file to edit or master from, or from WAV to MP3 when a file is too big to email, upload or fit on a phone. M4A, AAC, OGG and FLAC can be converted the same way, and every result shows exactly how much the size changed.

How to Convert MP3 to WAV and WAV to MP3

  1. 1

    Choose the output format

    MP3 for a small file, WAV for an uncompressed one. The trade-off is described under the picker.

  2. 2

    Pick a bitrate for MP3

    192 kbps is a good default for music and 128 kbps is plenty for speech. Higher bitrates sound better and produce bigger files. WAV has no bitrate setting — it is uncompressed.

  3. 3

    Add your files

    Drop in one file or a batch. MP3, WAV, M4A, AAC, OGG and FLAC can all be mixed together, and each row shows what it will be converted to.

  4. 4

    Convert and download

    Press Convert. Each result shows the old size, the new size and the percentage change, and you can download them individually or all at once.

How it works

Two different jobs sit behind one button. Decoding is the browser's own work — the same machinery that plays audio on a web page reads MP3, M4A, OGG and FLAC into raw samples, which is why the input list is as long as it is. Encoding is where they part. WAV is written directly: raw samples become 16-bit PCM with a 44-byte header, which is why it is instant and lossless from that point on. MP3 has no browser encoder at all — the WebCodecs API can encode AAC and Opus, but not MP3 — so that path runs LAME, the reference MP3 encoder, compiled to JavaScript. It is loaded only when you actually ask for an MP3. Neither step is AI, and neither should be: these are codecs, defined by specification, where the right answer is the one the standard says it is.

Supported formats

WAV, MP3, M4A, AAC, OGG and FLAC. Files are decoded by your browser, so anything it can play will work here. Output is exported as WAV.

Frequently asked questions

Is my audio uploaded anywhere?
No. Everything runs inside your browser using the Web Audio API, so the file never leaves your device. You can prove it: load the page, turn off your Wi-Fi, and the tool still works.
Does converting MP3 to WAV improve the quality?
No, and nothing can. MP3 is lossy — detail is discarded when the MP3 is made, and converting to WAV cannot bring it back. What it does give you is a file that will not lose anything further as you edit it, which is why WAV is the right working format even though it is bigger.
Which bitrate should I pick?
192 kbps is a safe default for music, and 256 or 320 kbps if you want to be careful with material you will keep. For speech — podcasts, interviews, voice memos — 128 kbps sounds fine and roughly halves the size again.
Is there a file size limit?
There is no size limit, only the daily processing allowance shared by all the free tools. Very large files are limited by your browser's memory rather than by us, since everything is processed on your own device.
What formats can I convert from?
Anything your browser can play: MP3, WAV, M4A, AAC, OGG and FLAC all work, and can be mixed in one batch. Output is MP3 or WAV.
Does this use AI?
No. Audio codecs are defined by specification, not learned — converting between them is exact engineering with a correct answer, and a model would only add guesswork. Audio Magic saves the AI for problems that genuinely need it: Whisper for transcription and translation, and RNNoise or DeepFilterNet3 for separating a voice from background noise.
Do I need an account?
No. The free tools work straight away with no sign-up. Creating a free account raises your daily processing limit from 20 to 60 minutes.
Is it free?
Yes. Every tool on this page is free to use, with a daily limit on total audio processed. There is no watermark and no trial period.

Other free audio tools