Online AU to M4A Converter

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What is an M4A File?

M4A is an audio file format developed and popularized by Apple. It is based on the MPEG-4 Part 14 standard and typically contains audio encoded with AAC (Advanced Audio Coding) compression.

Key Advantages of M4A Files:

High Quality: M4A files often use AAC encoding, which offers high-quality audio with efficient compression, suitable for digital music distribution.

Metadata Support: M4A supports embedding metadata such as artist, album, and track information, enhancing organization and accessibility.

Compatibility: Widely supported by Apple devices, iTunes, and other media players, ensuring seamless playback and management.

Limitations of M4A Files:

Proprietary Format: M4A is associated with Apple's ecosystem, which may limit compatibility with non-Apple devices and software.

Lossy Compression: Depending on the encoding settings, M4A files may exhibit slight quality loss compared to lossless formats like FLAC.


M4A is favored for its balance of high-quality audio and efficient compression, making it a popular choice for digital music distribution, particularly in the Apple ecosystem.

How to Convert AU to M4A?

Step 1: Select Your Audio

Choose your AU audio file by dragging it into the upload area or by clicking 'Browse' to locate it on your device.

Step 2: Configure Audio Settings

Adjust the settings for your M4A audio file. Choose the bitrate, sample rate, and other preferences.

Step 3: Convert the Audio

Click on the 'Convert' button to start converting your AU audio to M4A format.

Step 4: Get Your Converted Audio

Click the 'Download' button after the conversion to save your new M4A audio file to your device.

Step 5: Additional Conversion

Click the 'Convert Another' button to convert another AU file to M4A.

AU to M4A Conversion FAQs

1. How do I convert AU files to M4A?

The conversion from AU to M4A is efficient and reliable. Simply upload your AU file, and our tool will convert it to M4A in a matter of seconds.

2. How do I select AU files for converting to M4A?

You can upload AU files by dragging them or using the 'Browse' button. Once uploaded, the conversion process will begin automatically, resulting in a M4A file.

3. How can I save the converted M4A file?

Your M4A file can be downloaded by clicking Download. The download link will be provided after the conversion process is finished, enabling you to save the M4A file.

4. Is there a limit to the number of AU files I can convert to M4A?

You can batch convert AU files to M4A without any issues. The tool supports multiple uploads, enabling you to convert several AU files to M4A at once.

5. Is there an option to convert additional AU files?

Use the 'Convert Another' option or the file uploader to start a new conversion. This allows you to initiate another AU to M4A conversion seamlessly after completing one.

6. Are my AU files safe during the M4A conversion?

Client-side conversion ensures your files remain secure during the process. Your AU files are not uploaded, providing a secure environment for the M4A conversion.

7. What quality can I expect from converted M4A files?

We ensure top-notch quality for all converted M4A files. The conversion process is designed to preserve the original quality of your AU files in the M4A format.

8. Can I convert large AU files to M4A?

You can upload files up to 25MB in size for conversion. This limit ensures that the conversion process is quick and efficient, providing you with a M4A file without delay.

9. What is the time required to convert AU to M4A?

The conversion time depends on the file size and your internet connection speed, but it's usually very fast. Our tool is optimized to provide quick conversions, ensuring you get your M4A file promptly.

10. Where can I get help if I encounter issues with AU to M4A conversion?

If you encounter issues, visit the 'Contact Us' page for support. Our team is here to assist you with any problems or questions about converting AU to M4A.