Convert M4A to WAV
on iPhone, privately.

M4A is the compressed AAC format that Apple Music, Voice Memos and most iPhone recording apps write by default. It plays almost everywhere, but a number of tools still expect uncompressed PCM audio: desktop editors that work sample by sample, hardware samplers, older playback devices, and upload forms that list WAV as the only accepted format.

Filemorph decodes the M4A with Apple's AVFoundation and writes the result as a 16-bit WAV at the same sample rate and channel count as the source. Decoding does not bring back detail the AAC encoder discarded, so the WAV sounds the same as the M4A, only in a container every audio tool can read. Expect a much larger file: uncompressed stereo at 44.1 kHz takes roughly ten megabytes per minute.

Why convert M4A to WAV?

Compatibility, not quality. WAV is the common denominator for audio software and hardware: every editor, DAW, sampler and transcription service reads it, while AAC support varies from tool to tool. Converting to WAV removes the format question so you can get on with the edit or the upload.

Is it private?

Yes. Unlike web converters that upload your files to a server, Filemorph converts every file locally using Apple's frameworks. Nothing leaves your device, and it works with no internet connection. This operation is part of Filemorph Pro ($29.99/year, 7-day free trial on monthly and annual plans).