M4A to WAV 16-Bit:
Sample Rate, Bit Depth & Channels

How to Convert M4A to 16-Bit WAV

1. Upload the M4A file in the converter above (up to 100 MB).
2. Keep Bit depth on 16-bit (the default), then pick the sample rate (44.1 kHz by default; 22.05, 48 and 96 kHz are also offered) and Stereo or Mono.
3. Convert and download the WAV. When the output has fewer bits than the decoded audio, the converter adds Shibata dither, which keeps rounding noise low and hard to hear.

Understanding Your M4A Source

M4A files use AAC (Advanced Audio Coding) inside an MPEG-4 container. The audio quality of your source depends on where it came from:

Sample Rate: 44.1 kHz vs 48 kHz

Sample rate defines how many times per second the audio waveform is captured. Higher sample rates capture higher frequencies, but both 44.1 kHz and 48 kHz exceed human hearing (~20 kHz).

Recommendation: Use 44.1 kHz for music and general audio (matches your M4A source). Use 48 kHz only if the WAV will be used in video editing. CleverUtils uses the SoXr audiophile-grade resampler when sample rate conversion is needed.

Bit Depth: 16-bit vs 24-bit

Bit depth determines the dynamic range — the difference between the quietest and loudest sound the file can represent. More bits = a lower noise floor.

Recommendation: Choose 16-bit for listening, sharing, or burning CDs. Choose 24-bit if you plan to edit the audio in a DAW (Audacity, Pro Tools, Logic) — it keeps the noise floor lower while you process. For room above 0 dBFS, choose 32-bit float.

Stereo vs Mono

Stereo (2 channels) is standard for music. Mono (1 channel) halves file size and is ideal for voice-only content.

Converting iPhone Voice Memos

iPhone Voice Memos are saved as M4A files: AAC with the default Compressed audio quality, ALAC with Lossless. Many memos are mono, but newer iPhones can record in stereo. Check the file (Get Info on a Mac, or MediaInfo), then use:

• Sample Rate: match the recording (44.1 or 48 kHz)
• Bit Depth: 16-bit for sharing, 24-bit for editing
• Channels: Mono for a mono memo (stereo would just duplicate the channel); Stereo if it was recorded in stereo

This gives you a WAV file that's compatible with any audio editor. Share the Voice Memo to your Files app first, then upload the .m4a file to the converter above.

File Size Reference

WAV is uncompressed, so file sizes are exactly predictable. Here is how common settings compare for a 4-minute audio file (1 MB = 1,000,000 bytes):

For comparison, the same 4-minute song as M4A (256 kbps iTunes Plus) is about 7.7 MB — about 5.5x smaller than CD-quality WAV.

Which Settings Should You Use?

Converting M4A to WAV Doesn't Improve Quality

This is the most common misconception. When you convert a 256 kbps M4A to a 44.1 kHz / 24-bit WAV, the file gets much larger but the audio quality stays exactly the same.

AAC compression permanently removes audio data that the encoder considers inaudible. Converting to WAV unpacks the remaining data into an uncompressed container, but it cannot restore what was already discarded. Think of it like printing a JPEG at 300 DPI — you get more pixels, but the compression artifacts are still there.

So why convert M4A to WAV? Because WAV is a better working format:

• Audio editors (Audacity, Pro Tools, Logic) work natively with WAV — no decoding overhead
• Re-saving a WAV doesn't degrade quality (unlike re-encoding M4A/AAC)
• CD burning requires PCM/WAV input
• Some hardware and broadcast systems only accept uncompressed audio

If you need the highest possible quality, start from the original lossless source (CD, FLAC, ALAC) rather than a lossy M4A. If your M4A file is Apple Lossless (ALAC), then converting to WAV is truly lossless — no data was discarded.

16-Bit vs 24-Bit vs 32-Bit Float WAV

AAC is lossy, so a higher bit depth does not add detail to an M4A’s audio. Pick 24-bit or 32-bit float only if you will edit or process the WAV; for a 24-bit ALAC source, 24-bit keeps its full resolution.