# M4A to WAV Converter

> To convert M4A to WAV, choose your file in the tool above, pick 44.1 or 48 kHz, then press Download WAV. The conversion runs in your browser, so the file is never uploaded. It's free with no account. Files can be up to 60 MB, about an hour of 128 kbps M4A, and the result is a 16-bit WAV. Expect it to be about 11 times bigger, with no gain in sound quality.

URL: https://kenerateai.com/m4a-to-wav
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 4 November 2026

## Key facts
- Opens: M4A with AAC audio, plus MP3, WAV and OGG (what your browser decodes)
- Download: 16-bit WAV, stereo or mono
- Sample rate: 44.1 kHz or 48 kHz, your choice
- File limit: 60 MB (about 1 hour of 128 kbps M4A)
- WAV size: About 10.6 MB per minute (stereo, 44.1 kHz)
- Files at once: One
- Privacy: Processed on your device
- Cost: Free, no account, no watermark
- Demo "Crate Digger" (Boom-bap, MiniMax Music 3.0): prompt: Classic boom-bap hip-hop beat, dusty kick and snare, chopped soul sample, deep bass, head-nod groove, 90 bpm
- Demo "Rio Afternoon" (Bossa nova, Ken Music 1.5): prompt: Bossa nova, nylon-string guitar, soft brushes, flute melody, warm and breezy, Rio beach afternoon, 124 bpm
- Demo "Hands Up" (EDM, MiniMax Music 3.0): prompt: Big-room EDM festival track, huge build-up, massive drop with punchy kick and lead synth, crowd energy, 128 bpm

## Steps
1. Choose your M4A file — It can be up to 60 MB, and it opens on your device.
2. Pick a sample rate — 44.1 kHz for music, 48 kHz for video.
3. Preview it — Press Preview to check it's the right file. The tool shows the length and the WAV size.
4. Download the WAV — It saves with the same name and a .wav ending. Your M4A isn't changed.

## In depth

### What M4A and WAV actually are
M4A is the usual ending for audio-only MPEG-4 files [1]. It's a container rather than a codec, and the audio inside is most often AAC, which is compressed and lossy. WAV normally holds plain uncompressed PCM audio, so almost any editor or sampler can read it without decoding.
That's the main reason to convert. Some editing software, samplers and upload forms ask for WAV, and the conversion gets you past that. It doesn't make the recording sound better.

### What happens to your file
When you choose a file, the browser reads it from your disk and decodes it to raw audio in memory, using the Web Audio API [2]. The tool then writes those samples out as a 16-bit WAV. No part of it is sent anywhere, and closing the tab clears it.
The decoder resamples audio to the rate it's asked for [3], which is how the 44.1 and 48 kHz choice works. The WAV keeps mono files mono. A surround file keeps only its first two channels.

### How long big files take
We timed the tool on 4 November 2026 in Edge on one Windows desktop, using generated test files. Your times will differ, and we haven't measured phones, Safari, Firefox or Chrome.
- Three-minute AAC M4A, 2.9 MB — opened in about 0.3 seconds. It made a 31.8 MB WAV at 44.1 kHz or a 34.6 MB WAV at 48 kHz.
- One-hour AAC M4A, 58.4 MB at 128 kbps — opened in 5.3 seconds and exported in 1.7 seconds, making a 635 MB WAV.
- Apple Lossless M4A — wouldn't open in Edge. The same file converted fine with ffmpeg.
- Anything over 60 MB — refused with a message, before it's read.

### When a browser tool isn't the right fit
This converter suits one file you want to keep private. Use something else in these cases:
- Files over 60 MB, batches or Apple Lossless — ffmpeg is free and runs on your own computer: ffmpeg -i input.m4a output.wav
- You want MP3 or FLAC — this tool only writes WAV. The M4A to MP3 converter covers MP3, and FLAC needs a desktop converter.
- You want part of the file — the audio trimmer opens M4A and saves the section you keep as a WAV.
- The audio is inside a video — pull it out first with the extract audio from video tool.

References:
[1] Wikipedia — MP4 file format: https://en.wikipedia.org/wiki/MP4_file_format
[2] MDN — Web Audio API: https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API
[3] MDN — BaseAudioContext.decodeAudioData(): https://developer.mozilla.org/en-US/docs/Web/API/BaseAudioContext/decodeAudioData

## FAQ
Q: How do I convert M4A to WAV for free?
A: Choose your file in the converter at the top of this page, pick a sample rate, then press Download WAV. It's free, with no account and no watermark.

Q: Is my file uploaded?
A: No. Your browser decodes the file and builds the WAV on your device, so the audio never reaches our servers.

Q: Does converting M4A to WAV improve the quality?
A: No. Most M4A files use AAC, which is lossy, and detail removed when the M4A was made can't come back. The WAV holds exactly what the M4A could play, in a bigger file that editors handle easily.

Q: Does converting lose any quality?
A: Very little, and nothing you'd normally hear. The WAV is 16-bit and isn't compressed again. If your chosen rate differs from the file's rate, the audio is resampled to match.

Q: Should I choose 44.1 or 48 kHz?
A: Use 44.1 kHz for music and 48 kHz for video, unless an app or a person has asked for something else. Neither adds detail to the file.

Q: Why is the WAV so much bigger than the M4A?
A: WAV is uncompressed. A stereo file at 44.1 kHz takes about 10.6 MB per minute, while a 128 kbps M4A takes about 1 MB per minute. At 48 kHz it's about 11.5 MB per minute.

Q: Why won't my M4A open?
A: M4A is a container, so the audio inside can vary. Apple Lossless failed in Edge when we tested it, while ordinary AAC files worked. Protected .m4p files, from older iTunes purchases, are encrypted and won't open here. For Apple Lossless, try ffmpeg: ffmpeg -i input.m4a output.wav

Q: Can I convert several files at once?
A: No, this tool handles one file at a time. For a big batch, a desktop tool such as ffmpeg will be quicker.

Q: Can I convert M4A to MP3 here?
A: Not with this tool, which always saves a WAV. Use our M4A to MP3 converter for that. It also runs on your device, and you can pick 128, 192 or 320 kbps.

Q: How big a file can I convert?
A: Up to 60 MB. In Edge on a Windows desktop, a one-hour M4A of 58.4 MB opened in about 5 seconds and made a 635 MB WAV. We haven't measured phones, which have less memory, so long files may fail there.

## Related pages
- MP3 to WAV converter: https://kenerateai.com/mp3-to-wav
- M4A to MP3 converter: https://kenerateai.com/m4a-to-mp3
- Audio trimmer: https://kenerateai.com/audio-trimmer
- Extract audio from video: https://kenerateai.com/extract-audio-from-video
- Reverse audio: https://kenerateai.com/reverse-audio
- BPM & key finder: https://kenerateai.com/bpm-key-finder
- Sound test: https://kenerateai.com/sound-test
- AI music generator: https://kenerateai.com/ai-music-generator

## Sources
- FFmpeg documentation: https://ffmpeg.org/ffmpeg.html