Free tool

MP3 to WAV Converter

Some software only takes WAV: samplers, some editors, CD burning tools, telephone systems and scientific programs. Convert an MP3 to a standard 16-bit WAV here in seconds, without uploading it.

01 — Your file

Choose a file

02 — Result

Your converted file

Choose a file and press Convert to WAV. The conversion runs in this tab, so even large files never leave your computer or phone.

Steps

  1. Open the MP3 with the box above.
  2. Press "Convert to WAV".
  3. Download the WAV.

Why WAV is still required

WAV is uncompressed PCM audio with a tiny header. Any program can read it without a decoder, without patent questions and without guessing at timing, which is why it remains the safe input for:

  • audio editors and DAWs, where editing uncompressed audio avoids repeated lossy encodes;
  • hardware samplers, drum machines and DJ gear with limited codec support;
  • CD burning software, which writes audio CDs from 44.1 kHz, 16-bit WAV;
  • phone systems and IVR menus, which often want WAV for greetings and hold messages;
  • research and machine-learning tools that read raw samples.

What changes and what doesn't

The converter decodes the MP3 and writes the samples into a WAV at the same sample rate and channel count, which for most MP3s means 44.1 kHz stereo. The WAV sounds identical to the MP3. It does not sound better: the detail MP3 encoding removed is gone for good, and the WAV simply stores the decoded result without further loss.

Expect the file to grow about tenfold. A 4 MB song becomes roughly 40 MB, and an hour of audio becomes around 600 MB.

Phone systems with special requirements

Some telephone systems need 8 kHz mono WAV, sometimes in a telephony encoding such as mu-law. This tool writes standard 16-bit PCM at the MP3's own rate, which most modern systems accept. If yours insists on 8 kHz, its documentation or an audio editor will have an export option for it.

How the free converter works

The converter is ffmpeg, the open-source media toolkit, compiled to WebAssembly so it runs inside your browser tab. Your file is read straight from your disk by that engine; it is never uploaded to mydubly or anywhere else, and no account is needed.

  • The engine is about 30 MB and downloads the first time you convert something. After that your browser normally keeps it.
  • Large inputs are fine because the file is read in place, but the result is built in memory, so outputs are capped at about 1.5 GB.
  • Speed depends on your device. Copying streams takes seconds; re-encoding video is the slow case.
  • Keep the tab open until the download button appears. Closing it stops the conversion.

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Frequently asked questions

Does converting MP3 to WAV improve the quality?

No. The WAV holds exactly the decoded MP3 sound. It prevents further loss while editing but cannot restore what MP3 removed.

What format is the WAV?

Standard 16-bit PCM WAV at the MP3's sample rate, usually 44.1 kHz stereo.

Can I use the WAV to burn an audio CD?

Yes, if the MP3 was 44.1 kHz, which almost all music MP3s are. Burning software will accept the WAV directly.

Why is the WAV so much bigger?

WAV stores every sample uncompressed, around ten times the space of a typical MP3.