Free online WAVE to M4A converter

Phones, music applications, and sharing platforms may require M4A instead of an uncompressed WAVE file, and AAC M4A usually takes much less storage and upload bandwidth. Convert the file when a target application requires AAC or when you need a smaller copy for playback and sharing.

What the WAVE format is

WAVE, usually identified by the .wav extension, is a Microsoft and IBM RIFF audio container. It most commonly stores uncompressed PCM audio, so it preserves the source samples without lossy compression. Windows audio tools, digital audio workstations, recording software, audio interfaces, voice recorders, and mastering workflows commonly use it.

PCM WAVE files are large: CD-quality stereo audio uses approximately 10 MB per minute. WAVE can contain codecs other than PCM, so inspect the file's codec, sample rate, and bit depth when those properties matter.

What the M4A format is

M4A is an audio-only MPEG-4 container, not a single audio codec. It most commonly contains lossy AAC audio, but it can also contain Apple Lossless Audio Codec (ALAC) audio.

AAC M4A provides substantially smaller files than PCM WAVE at similar perceived quality and is supported by Apple devices and software, Android, Windows, macOS, and many current media players. ALAC M4A retains every source sample and is smaller than PCM in many cases, but it does not reduce size as much as AAC and may be unsupported by older players.

How to convert with 101convert.com

1. Open the WAVE-to-M4A converter on 101convert.com.
2. Add the .wav file from your device.
3. Choose M4A if the converter displays an output-format selector, then start the conversion.
4. Download the resulting .m4a file and test it in the application or device that will use it.

This option requires no software installation. Do not upload confidential recordings unless the service's current privacy, retention, and deletion terms are suitable for the material.

How to convert with FFmpeg

FFmpeg is appropriate for local conversion, repeatable settings, and batch processing. Run the following command in a terminal or Command Prompt after installing FFmpeg:

ffmpeg -i input.wav -c:a aac -b:a 256k output.m4a

Replace input.wav with the source filename. AAC at 192–256 kbps suits most music; speech often works at 96–128 kbps. To create a lossless ALAC file instead, use:

ffmpeg -i input.wav -c:a alac output.m4a

ALAC avoids additional lossy compression but does not make a lossy source lossless. FFmpeg generally transfers compatible metadata, but verify titles, artwork, and other tags after conversion.

How to convert with a desktop audio editor

In Audacity, open the file through File → Open, then choose File → Export Audio. Select an M4A or AAC export option, choose the bitrate, set a destination ending in .m4a, and export. M4A export availability and menu names depend on the Audacity version and installed FFmpeg support; if the option is missing, use FFmpeg or an editor with built-in AAC export.

Quality and compatibility limits

PCM WAVE to AAC M4A is a lossy conversion: AAC discards audio information, and converting the result back to WAVE cannot restore it. Keep the original WAVE as the editing or archival master and use M4A as a delivery copy.

Do not repeatedly export an already compressed M4A through another lossy codec; each generation can add artifacts. Conversion does not improve the source's recording quality, sample rate, or bit depth. AAC M4A is generally the safer choice for broad playback compatibility, while ALAC M4A is preferable when lossless storage is required and the target software explicitly supports ALAC.