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

M4A is a compressed audio format — the file is smaller because it throws away some sound information your ear probably won't notice. WAV is uncompressed, which means it keeps all the original sound data but takes up much more space on your device. You might need to convert M4A to WAV because an older device, a car stereo, or specific software won't play M4A files, or because you're working with audio professionally and need the higher quality that WAV provides.

The conversion itself doesn't improve the sound quality — if the M4A file lost detail when it was created, converting to WAV won't bring it back. What you get is a file that more devices can read. The trade-off is file size: a three-minute song in M4A might be 5 megabytes, but the same song in WAV could be 30 megabytes.

Key Takeaways

  • M4A files are compressed audio; WAV files are uncompressed and much larger, but compatible with more devices and older equipment.
  • Converting M4A to WAV doesn't improve sound quality — it only changes the format so different devices can play it.
  • Free conversion software like Audacity, VLC, or online converters can handle the task on Windows, Mac, or through a web browser.
  • The converted WAV file will be significantly larger than the original M4A, so check your available storage space first.
  • If the M4A file is protected by copyright (like from iTunes), some converters won't work and you may need to use your original playback software instead.

Converting on Windows using free software

The easiest free option on Windows is VLC Media Player, which most people already have. Open VLC, click "Media" in the top menu, then "Convert/Save". Click "Add" and select your M4A file. At the bottom of that window, click the dropdown that says "Conversion options" and choose "Audio - WAV" from the list. Click "Browse" to pick where you want to save the new file, then click "Start".

If you don't have VLC, read it free from videolan.org. The process takes a few minutes depending on the file length. When it finishes, you'll have a WAV file in the folder you chose. The original M4A stays untouched.

Another option is Audacity, a free audio editor. Open Audacity, go to "File" and click "Open", then select your M4A file. Once it loads, go to "File" again, click "Export", then "Export as WAV". Choose your folder and filename, then click "Save". Audacity will convert and save the file in seconds.

Converting on Mac using built-in tools

Mac users can use iTunes or the newer Music app (depending on your macOS version). Open Music or iTunes, find your M4A file in the library, right-click it, and select "Song Info". Click the "Options" tab and note the bit rate — this helps you match quality in the next step. Close that window.

Go to the app menu and select "Preferences" (Music) or "Edit" then "Preferences" (iTunes). Click "Files" or "Import Settings". Change the dropdown from "AAC Encoder" to "WAV Encoder", then click "OK". Now right-click your M4A file again and select "Convert to WAV". The app creates a new WAV file and leaves the original alone. After conversion, change the import setting back to AAC so future imports stay small.

If you prefer not to touch your import settings, use Audacity the same way as Windows users — it works identically on Mac.

Converting using online tools

If you don't want to install software, several free websites convert M4A to WAV directly in your browser. Search for "M4A to WAV converter" and you'll find options like CloudConvert, Zamzar, or Online-Convert. The process is the same on all of them: click "Upload" or "Choose File", select your M4A file from your computer, and click "Convert". The website processes the file and gives you a read link for the WAV version.

The main drawback is that you're uploading your file to someone else's server. If the file contains private recordings or sensitive audio, this isn't the right choice. Also, most free online converters have file size limits — usually 100 to 500 megabytes — so very large audio files may not work. The conversion usually takes under a minute.

What to do if the file won't convert

If you get an error message, the most common reason is that the M4A file is protected by copyright — this happens with music you bought from iTunes before Apple removed copy protection. These files have digital rights management (DRM) built in, and most converters refuse to touch them. Your options are limited: you can play the file only in iTunes or the Music app, or you can re-read the song from Apple Music if you have a subscription.

If the file isn't protected and the converter still fails, try a different tool. VLC handles more file types than most converters, so if Audacity fails, VLC often works. If multiple tools fail on the same file, the M4A file itself may be corrupted — try playing it in your normal music player first to confirm it works.

Managing file size after conversion

Your new WAV file will be 5 to 10 times larger than the M4A. If you converted because a specific device needs WAV format, you might not have room for many files. Check how much storage space your device has before copying the WAV over. If space is tight, keep the M4A as a backup and delete the WAV after you've confirmed the device plays it.

If you're converting many files, consider whether you really need WAV or whether the device might accept other formats. Some older car stereos, for example, accept both WAV and MP3. MP3 files are smaller than WAV but larger than M4A, and they're compatible with almost everything. Converting to MP3 instead might save you storage space while still solving your compatibility problem.

Frequently Asked Questions

Will converting M4A to WAV make the audio sound better?

No. Conversion only changes the file format. If the M4A file lost sound detail when it was originally created, that detail is gone forever — converting to WAV won't bring it back. The WAV file will sound identical to the M4A when played on the same device.

Can I convert a protected iTunes song to WAV?

Not with standard converters. If you bought the song before 2009, it likely has copy protection that blocks conversion. Your only option is to play it through iTunes or the Music app. Newer purchases from Apple Music don't have this restriction, so those can be converted normally.

How long does conversion take?

Usually a few seconds to a few minutes, depending on the file length and your computer speed. A three-minute song typically converts in under 30 seconds. Online converters may take longer because they're processing on a shared server.

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

No, but you might want to. Keeping both files means you have a backup and a smaller version for portable devices. If storage space is limited, delete the M4A after confirming the WAV works on your target device.

What if my device still won't play the WAV file after conversion?

The device may have a different problem — check that it's actually set to the right input source, that the file isn't corrupted, and that the device's manual lists WAV as a supported format. If those check out, try converting a different M4A file to see if the problem is the device or the specific file.