Converting WAV to M4A encodes through AAC and wraps the result in an MPEG-4 container with proper metadata support. It's the format Apple's ecosystem writes by default, and it produces small files that sound great at sensible bitrates with full tag, artwork, and chapter support.
Drag & drop audio files here, or browse
Drop your WAV files here
Lossy compression trades some signal for a file roughly 8–10× smaller than WAV. M4A at 256 kbps is transparent to nearly everyone; at 128 kbps it's better than MP3 at the same bitrate. Pick your bitrate based on listening context, not paranoia.
M4A plays on all Apple devices, Android (since 3.0), Windows (iTunes, VLC, Groove), and every modern browser. Older car stereos may balk, but modern ones all handle it.
WAV is Microsoft and IBM's uncompressed PCM container. A stereo CD-quality recording takes about 10 MB per minute. Because nothing is thrown away and nothing is compressed, WAV is the universal working format for recording, editing, and mastering in every major DAW.
M4A is an MPEG-4 container that almost always holds AAC audio (though it can hold ALAC too). The payload is identical to what's inside an .aac file; the difference is that M4A carries proper tags, chapter markers, and cover art. iTunes, Apple Music, and iOS write M4A by default.
The audio codec is identical; both contain AAC data. M4A adds an MPEG-4 container with proper tag support, album art, and chapter markers. Raw .aac files lack that and are mostly used for streaming.
No. M4A usually holds AAC, which is lossy. The container can technically hold ALAC (Apple Lossless) too, but that's a separate codec and most M4A files in the wild are lossy AAC.
WAV is Microsoft and IBM's uncompressed PCM container. A stereo CD-quality recording takes about 10 MB per minute. Because nothing is thrown away and nothing is compressed, WAV is the universal working format for recording, editing, and mastering in every major DAW.
M4A is an MPEG-4 container that almost always holds AAC audio (though it can hold ALAC too). The payload is identical to what's inside an .aac file; the difference is that M4A carries proper tags, chapter markers, and cover art. iTunes, Apple Music, and iOS write M4A by default.
Yes. The converter runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio files are never uploaded, never sent to a server, and never leave your device.
There's no hard limit, but because everything runs in your browser you're bounded by available memory. Files over about 2 GB total can get slow or hit browser memory limits. Process in smaller batches if you run into issues.