Convert M4A to WAV
Drop an .m4a file and download a 16-bit PCM WAV. Sample rate and channel count are preserved, so a 48 kHz mono voice memo becomes a 48 kHz mono WAV.
iPhone voice memos, meeting recordings, and screen-capture audio tracks all arrive as AAC in an MP4 container. Editors, forced-alignment tools, and older transcription software often want PCM instead.
What the WAV contains
The AAC decoder output is written straight to PCM. Whatever the encoder discarded when the recording was made stays missing, so the WAV is a working copy rather than an upgrade.
Mono recordings stay mono
Voice memos are usually single-channel. The channel count is carried through rather than expanded, which keeps the file at half the size of a stereo export and avoids duplicating identical samples across two channels.