M4A to WAV Converter
Convert M4A (AAC or Apple Lossless) and iPhone voice memos to WAV in your browser: 16-bit, 24-bit or 32-bit float, any sample rate, mono.
WAV is the format audio editors, DAWs, transcription services and broadcast tools accept without question. This converter turns M4A files, iPhone voice memos, GarageBand exports and M4B audiobooks into uncompressed WAV inside your browser, with the bit depth, sample rate and channels you need. Nothing is uploaded.
How to use this tool
- Choose one or more M4A files.
- Pick the bit depth: 16-bit works everywhere, 24-bit or 32-bit float for editing.
- Keep the sample rate, or choose 48 kHz for video or 16 kHz for speech recognition.
- Press Calculate and download the WAV files.
Formula
WAV size = sample rate × channels × bytes per sample × seconds + header (44 bytes, or 68 for 24-bit)
AAC in M4A is decoded by the browser at the sample rate you choose and written as PCM; nothing is lost beyond what the AAC encoder already removed. Apple Lossless (ALAC) files, and files the browser cannot decode, are converted by the ffmpeg engine (about 30 MB, downloaded once), which writes the WAV directly and keeps ALAC bit-exact; its WAV files carry a short software tag, so they are 34 bytes larger than the formula.
Example
A 3-minute iPhone voice memo (mono, 48 kHz) is about 1.4 MB as M4A. As a 16-bit WAV it becomes 48,000 × 1 × 2 × 180 = 17.3 MB; at 16 kHz for a speech recognizer, 5.76 MB.
Frequently asked questions
Does converting to WAV improve the quality?
No. WAV stores exactly what the decoder produces, so it sounds the same as the M4A. It is useful because editors and other tools read it easily and it does not lose more quality when edited.
Which bit depth should I choose?
16-bit for listening and most uses. 24-bit or 32-bit float if you will edit, mix or apply effects, so rounding errors stay inaudible.
Can I convert Apple Lossless?
Yes. ALAC M4A files are decoded exactly; use 24-bit if the original is a 24-bit recording.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/m4a-to-wav-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). M4A to WAV Converter. https://kakao.mobile/tools/m4a-to-wav-converter/
“M4A to WAV Converter.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/m4a-to-wav-converter/.