How to Convert WAV to AAC

Essential answer

To convert WAV to AAC, open a WAV to AAC converter, add the WAV file, select AAC as the output format, then start the conversion. AAC is a lossy format, so the resulting file will usually be smaller than the original WAV. Audio quality is controlled mainly by the AAC bitrate setting.

What changes in a WAV to AAC conversion

WAV is normally an uncompressed audio format. It keeps the recorded audio data in full, which produces large files and predictable quality. AAC is a lossy compressed format. During conversion, some audio data is removed to reduce file size. At a suitable bitrate, the difference may be difficult to notice; at a very low bitrate, spoken audio or music may begin to sound less detailed or slightly distorted.

The conversion result depends on the source audio and the selected AAC settings. A clean voice recording will generally tolerate a lower bitrate better than a complex music track. A higher bitrate keeps more detail and produces a larger AAC file.

Workflow

Before starting, have the WAV file available and choose a converter. A free WAV to AAC converter may be downloadable software or an online converter. Online converters avoid installation but require uploading the audio file to a remote service.

• Open the WAV to AAC converter.
• Add or import the WAV file you want to convert.
• Set the output format to AAC.
• If the converter offers audio settings, select the desired bitrate or quality profile. A setting around 128 kbps is a common general-purpose starting point; higher bitrates retain more detail, while lower bitrates create smaller files.
• Choose where the converted file should be saved.
• Start the conversion and wait for it to finish.

How to know the conversion worked

Check that the converter reports completion and that a new file with an AAC or M4A extension appears at the chosen location. Compare the file size with the original WAV; the AAC version should normally be smaller, although the exact difference depends on the source material and bitrate. Open the output file in a media player and confirm that its duration matches the source and that the audio starts and ends as expected.

Quality and compatibility notes

AAC is widely supported by modern players, browsers and mobile devices, but support is not universal across every older device or application. If a target device does not accept the resulting file, check whether it accepts the M4A container used by the converter or whether a different output profile is available.

Conversion does not improve audio quality. Starting with a low-quality or damaged WAV will still produce a low-quality result. Keep the original WAV if you may need the uncompressed version later, because converting AAC back to WAV cannot restore the audio data removed during lossy compression.