How to Convert M4A to WAV — Step by Step

An M4A file — from iPhone Voice Memos, an iTunes or Apple Music library, or a GarageBand export — and a web browser. AudioUtils processes the file locally, so nothing uploads and it works on iPhone, iPad, Mac, Windows, and Android. One useful detail about M4A: the container can hold either AAC (lossy, the usual case for memos and downloads) or ALAC (Apple Lossless). Both convert to WAV cleanly, but the quality story differs — ALAC to WAV is a perfect, bit-for-bit lossless conversion, while AAC to WAV produces an uncompressed copy of the already-lossy audio. Either way you end up with a standard PCM WAV that editors accept. Because WAV is large, have some disk space ready: a short voice memo balloons from a couple of megabytes to twenty or thirty as WAV, which is the normal cost of an uncompressed, edit-ready file.

The reason is almost always editing and software compatibility. Audio editors and DAWs — Audacity, Pro Tools, Logic, Ableton, Reaper — prefer uncompressed WAV because it imports instantly, edits without decoding overhead, and does not accumulate compression loss as you cut, process, and re-save (editing an M4A and re-exporting it re-compresses lossy audio each time, degrading it). Some transcription services, forensic tools, samplers, and older or professional programs accept only WAV or PCM. And when a program simply refuses an .m4a with a format error, converting to WAV is the reliable fix. What converting does not do is improve quality: an AAC-sourced WAV holds exactly the audio the AAC decoded to, with nothing restored — you convert for an editable, universally-accepted working file, not a quality upgrade. When editing is finished, you export back to a compressed format (MP3 or AAC) for sharing, keeping the WAV only as long as you need the editable version.

The quickest method needs no software. Open the M4A to WAV converter on AudioUtils, drop your M4A onto the page (or tap to pick it on a phone), and click Convert. The AAC or ALAC audio is decoded and written as uncompressed PCM WAV locally via WebAssembly, so nothing uploads and the file is ready in seconds. Download it and import straight into your editor. The output WAV matches the sample rate and bit depth of the source content — for a typical iPhone voice memo, expect a 44.1 kHz or 48 kHz, 16-bit WAV, which is exactly what most editors want. Because the conversion runs on your device, it behaves identically on Mac, Windows, and iPhone, and it keeps private recordings — interviews, memos, unreleased material — off any server. For a single file you need edit-ready immediately, this is the fastest path from an Apple M4A to a working WAV.

Voice Memos are the most common M4A-to-WAV case, because the app records .m4a but editors want WAV. Start by getting the memo off the phone or into its browser: open Voice Memos, tap the memo, tap the three-dot menu, and choose Share, then save it to Files or AirDrop/email it to your computer. From there, open the M4A to WAV converter — you can do this right on the iPhone in Safari, or on a Mac or PC for a bigger screen — select the exported .m4a, convert, and import the WAV into Audacity, GarageBand, or your DAW. If you record memos often and edit them regularly, an iOS Shortcut using the 'Encode Media' action set to a WAV-friendly output can automate the export. Note that a memo may be mono or stereo depending on your iPhone model and settings, and the WAV will preserve that — check the channel count if your editor expects one or the other. The audio transfers faithfully; you are just giving your editor the uncompressed format it prefers.

On the desktop, the browser method works identically, but native options exist too. On Mac: QuickTime Player opens an M4A and exports via File > Export As, and the Music app can convert after you set WAV as the import format under Settings > Files > Import Settings, then File > Convert > Create WAV Version; GarageBand imports and exports WAV as well. On Windows: VLC converts via Media > Convert/Save with a WAV profile, and Audacity opens M4A (with its optional FFmpeg library installed) and exports as WAV. For any platform with a terminal, FFmpeg is the most direct — 'ffmpeg -i input.m4a output.wav', adding '-ar 48000' to force a sample rate or '-ac 1' to force mono. Choose the browser for a fast one-off, QuickTime or VLC for a native desktop tool, and FFmpeg when you need precise output settings or want to script a batch. All routes produce the same standard PCM WAV your editor will accept.

WAV has no bitrate, but its sample rate and bit depth matter for a clean editing workflow. Match the sample rate to your project: if your DAW or video timeline runs at 48 kHz, export the WAV at 48 kHz so nothing has to resample and your audio stays in sync; 44.1 kHz is the other common target for music. For bit depth, 16-bit is standard and fine for voice and general editing, while 24-bit adds processing headroom if you will apply heavy effects — though from an AAC source, 24-bit only adds headroom, not recovered detail. Match the channel count to your needs too: a mono voice memo can stay mono to keep the file small, or be exported stereo if your editor expects two channels. Avoid upsampling to 96 kHz or higher expecting quality gains; the M4A holds no information above its original rate, so a higher WAV rate just enlarges the file. The rule: set the WAV to match the software or project you are feeding, and pick bit depth by how much you will process it.

The WAV will be much larger and the quality will depend on the source. Size: a 2 MB voice memo becomes roughly 20-30 MB as WAV, and a 5 MB music file becomes 40-50 MB, because WAV stores uncompressed PCM at about 10 MB per minute for CD-quality stereo. Quality splits by source type: from an AAC M4A (the common case), the WAV is an uncompressed copy of the lossy audio — the same sound the AAC decoded to, with nothing that AAC discarded restored; from an ALAC M4A, the WAV is a bit-perfect, fully lossless representation of the original. In neither case does WAV add quality — it adds editability and compatibility at the cost of size. That trade is exactly what you want when the audio is headed into an editor, and it is why you keep the compact M4A for storage and make the big WAV only for the editing task at hand. Once editing is done, export to MP3 or AAC for a small distribution file.

Most snags are simple. Voice memo will not load: make sure you exported it properly from the iPhone first (Share > save to Files or AirDrop) rather than trying to grab it from the app directly. Protected files: DRM-locked M4A from very old iTunes purchases, or Apple Music subscription tracks, cannot be converted by any tool — re-download DRM-free versions where available; subscription streams never convert. Stereo when you expected mono (or vice versa): iPhone memos vary by model and settings, and the WAV preserves whatever the source used, so set the channel count explicitly if your editor is picky. Large files stall on a phone: WAV output is big, so use a desktop browser for long recordings, or close other tabs to free memory. WAV rejected by your editor anyway: check that the sample rate and bit depth match what the tool expects and re-export accordingly. None of these are conversion failures — they are properties of the source file or the destination software, each with a quick fix.