5. Audacity Audio Editor Online. Audacity Audio Editor Online is not an online M4A editor per se. Rather, it's a free Chrome plugin. That said, this tool lets you import and exports standard sound formats like MP3, OGG, FLAC, WAV, M4A, etc. You can even import or headerless audio using the Import Raw command.
Download and install iTunes if you don’t already have it. Open iTunes Preferences, and click Import Settings in the General tab. Select Import Using: as AAC Encoder, and select a suitable encoding bitrate. Ideally, 64 kbps should be decent enough for audiobooks. Import the source audio files into iTunes by drag and drop. Before starting the conversion, choose a folder to which you want to save the file. Click the "Save" button to start converting. Now you can convert M4A to WAV with Audacity successfully. 2 Methods to Convert M4A to WAV Online for Free. Other than installing and downloading an app, converting an M4A file to WAV online is also available.This is, in fact, an Audacity audio block file. Technically speaking, it comprises three data parts: header, a variable annotation block, and the actual audio data. Meanwhile, to freely edit your M4A files in Audacity, you need to convert M4A to AU. You can dig deeper into these formats by looking at the comparison chart below.
If you want to turn MP4 to M4A in bulk, drag and drop them all into the program at this step. Step 3. Set the output format as M4A. Hover over the "Target Format" section at the bottom of the interface. Click "Music > M4A" to select M4A as the output format. Step 4. Customize the M4A audio file (optional).