What M4A and WAV files are, and why you might need to convert

M4A is a compressed audio format — Apple uses it as the default for iTunes and many devices. WAV is an uncompressed format that takes up much more space but works on virtually every device and audio program without compatibility issues. You might need to convert M4A to WAV if you're working with audio editing software that doesn't read M4A files, burning a CD, or sending audio to someone using older equipment.

The conversion process is straightforward and doesn't require paid software. Your choice of tool depends on what you already have on your computer and whether you're converting one file or many at once.

Key Takeaways

  • Windows users can convert M4A to WAV using free tools like VLC media player or Audacity, both of which handle the format without additional plugins.
  • Mac users have the same free options, plus iTunes can export to WAV if you own the M4A file outright (not a protected purchase).
  • Audacity is the best choice if you want to edit the audio while converting, since it's a full audio editor available on Windows, Mac, and Linux.
  • VLC is fastest for simple conversion of multiple files at once without editing.

Converting with VLC media player

VLC is free, works on Windows and Mac, and handles M4A files without extra setup. Open VLC, go to Media in the menu bar, then select Convert/Save. Click Add, navigate to your M4A file, and select it. In the Convert/Save window, choose Audio - WAV from the Profile dropdown menu at the bottom. Click Browse to pick where you want to save the new WAV file, then click Start.

The conversion takes a few minutes depending on the file length. When it finishes, you'll have a WAV file in the location you chose. VLC works well for converting several files in a row — you can add multiple M4A files to the queue and let it process them without stopping.

Converting with Audacity

Audacity is a free audio editor that opens M4A files and exports them as WAV. Download Audacity from audacityteam.org, install it, then open the program. Go to File, then Open, and select your M4A file. Audacity will load the audio waveform into the editor.

Once the file is open, go to File, then Export, then Export as WAV. Choose where to save the file and click Export. A dialog box may appear asking about audio settings — the defaults work fine for most purposes. Click Export again to finish. This method is best if you want to trim, cut, or adjust the audio before saving it as WAV, since Audacity has all those tools built in.

Converting on Mac with iTunes

If the M4A file is one you own (not a protected purchase from the iTunes Store), you can convert it directly in iTunes. Open iTunes, locate the M4A file in your library, right-click it, and select Song Info. Go to the Options tab and note the start and end times if you want to convert only part of the file — otherwise leave them blank.

Close that window, then go to iTunes Preferences (or iTunes Settings on newer versions). Click Files, then look for the Import Settings option. Change the import format from AAC to WAV, then click OK. Right-click the M4A file again and select Create WAV Version. iTunes will create a new WAV file in the same folder as the original. After conversion, change the import settings back to AAC to avoid converting future imports by mistake.

Converting multiple files at once

If you have many M4A files to convert, VLC is the fastest option. Open VLC, go to Media, then Convert/Save. Click Add, then hold Ctrl (Windows) or Command (Mac) and click each M4A file you want to convert. Click Open, choose Audio - WAV from the Profile dropdown, then click Start. VLC will convert all of them in sequence without requiring you to repeat the steps for each file.

Audacity converts one file at a time, so it's slower for batch work. If you need to convert dozens of files and don't want to edit them, VLC is the better choice.

Understanding file size and quality after conversion

WAV files are significantly larger than M4A files because they store audio without compression. An M4A file that's 5 MB might become 40 MB or more as a WAV. The audio quality doesn't improve — you're not gaining anything by converting except compatibility. The conversion simply unpacks the audio data into a format more programs can read.

If storage space is tight, keep the original M4A file and only convert the files you actually need to use in another program. Once you've converted and confirmed the WAV file works where you need it, you can delete the M4A if you want to free up space.

Troubleshooting common conversion problems

If VLC won't open your M4A file, make sure you're using a recent version — go to Help, then Check for Updates. Older versions sometimes have trouble with certain M4A variants. If Audacity says it can't open the file, the M4A may be protected by Apple's DRM (copy protection). Protected files from the iTunes Store can't be converted with these free tools — you'd need to use iTunes on Mac or find the original unprotected version.

If the converted WAV file plays but sounds wrong — too fast, too slow, or distorted — try converting again with different software. Sometimes a corrupted M4A file will convert without error but produce bad audio. If the problem happens with multiple files, your M4A files are likely fine and the issue is with your audio hardware or speakers.

Frequently Asked Questions

Will converting M4A to WAV improve the sound quality?

No. WAV is uncompressed, but M4A was already compressed when created. Converting doesn't restore lost audio data or make it sound better — it only changes the container format. The audio quality stays the same.

Can I convert protected M4A files from iTunes?

Not with free tools. Protected files have copy protection that prevents conversion. If you purchased the file from iTunes, you can't convert it. If you own the original unprotected version, convert that instead.

How long does conversion take?

Usually a few minutes per file, depending on length and your computer's speed. A 3-minute song typically converts in under a minute. Longer files or older computers take proportionally longer.

Do I need to keep the M4A file after converting to WAV?

No, but it's safe to keep both until you confirm the WAV file works where you need it. Once you've tested the WAV, you can delete the M4A to save space — they contain the same audio.

What if my audio program still won't open the WAV file?

WAV is nearly universal, but very old programs sometimes need specific audio codec support. Check your program's documentation for supported formats, or try opening the WAV in a different program to confirm the file converted correctly.