This tool converts M4A to PCM completely free and without any functional limitations. Since it is based on the browser API, the processing speed is the fastest because all files are processed locally on your device and are not uploaded to our server.
To correctly play the PCM file you converted, set the playback parameters as:
- Format: s16le (signed 16-bit little-endian),
- Sample rate: 44100 Hz,
- Channels: 2 (stereo)
Since it's raw PCM with no headers, players like ffplay must be run with: ffplay -f s16le -ar 44100 -ac 2 out.pcm. In Audacity, import as raw and select the same settings.
Batch Convert M4A to PCM Online
With this SoConvert tool, you can convert multiple M4A files to PCM directly in your browser for free. You can also adjust the audio Bitrate during conversion.
Click the Options button in the top-right corner to open the settings panel, where you can customize the output PCM audio Bitrate.
Other Settings Explained:
Encoding Speed: Choose the encoding speed. Faster speeds result in larger file sizes.
Audio Bitrate: Recommended range is 8 – 320 Kbps.
Cut Audio: Trim the audio using a start and end time in HH:MM:SS format.
For example, setting 00:00:05 to 00:00:08 will cut a 3-second clip from the audio.
Before converting, you can choose a local folder to save the converted PCM files. Once an M4A file is successfully converted, it will be automatically saved to your selected directory—no manual download required.
Save All: After all M4A files are converted, click “Save All” to export every PCM file to your chosen folder in one go.
About M4A files
M4A (MPEG-4 Audio) is a high-quality audio format developed by Apple, based on the AAC (Advanced Audio Coding) standard. It offers better sound compression than MP3 while maintaining excellent audio quality, making it ideal for music and podcasts. M4A files are often used in iTunes and Apple devices, supporting lossy compression with smaller file sizes than MP3 at similar quality levels. Though less universal than MP3, it is widely supported on modern devices and media players.
About PCM files
PCM (Pulse Code Modulation) is the standard digital audio format that represents sound waves as numerical values. It's uncompressed, maintaining perfect audio quality but creating large file sizes. PCM serves as the basis for formats like WAV and CD audio, widely used in professional recording and broadcasting. Though not space-efficient, its lossless nature makes it ideal for high-fidelity audio applications where quality preservation is crucial.
