M4A is convenient. WAV is what your DAW wants.
Drop M4A or MP4 files and the browser writes real WAV files at the source sample rate — no account, no upload, batches out as a ZIP.
Free · no account · runs in your browser — nothing is uploaded; your audio never leaves your device.
The conversion happens on your machine: the browser reads the file and the audio never leaves your device — nothing is uploaded. The WAV is uncompressed 16-bit PCM, so it is several times larger than the M4A it came from, often around ten times the size for the same audio. No quality is gained: the AAC data was already lost when the M4A was made, and this only changes the container, so the reason to convert is compatibility with DAWs, editors and samplers, not a better sound. The WAV is written at the rate each row states — normally the sample rate stored in the file's own header, so a 44.1 kHz M4A comes back at 44.1 kHz rather than your sound card's rate, and each row states the rate, channels and size that were actually written. The header is a bare 44 bytes, so tags, cover art and other metadata from the M4A are not carried over.
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Frequently asked questions
Why will a DAW or sampler not take my M4A?
M4A and MP4 are containers built around AAC, a lossy codec designed for playback rather than editing. Plenty of DAWs and almost all hardware samplers expect PCM WAV and simply refuse the container. Converting to WAV gives them a file they can import at the sample rate they already expect.
Will the WAV sound better than the M4A?
No. This is the honest catch: the AAC encode already discarded detail, and writing a WAV cannot put it back. The WAV is bigger, not better. You convert for compatibility and for an editing format, not for a quality upgrade — the original encode is still the ceiling.
What sample rate and channels do I get?
The WAV keeps the source sample rate and channel layout, so a 44.1 kHz stereo M4A comes back as 44.1 kHz stereo WAV. Nothing is resampled or downmixed silently. Very large files or long recordings are best converted in smaller groups, since the work happens in your browser's memory.
Do the tags survive the conversion?
No — a WAV written in the browser carries a bare 44-byte header and no metadata, so title, artist, album and artwork do not come across. The audio itself is untouched: convert first, then tag the WAV afterwards with the tag editor.