WAV to AAC — Free, Compress Audio, No Upload

WAV files are uncompressed and carry audio at full fidelity, but their size makes them impractical for distribution. A three-minute song stored as a 44.1 kHz 16-bit stereo WAV is roughly 30 megabytes. The same track as 192 kbps AAC, the rate this converter uses, is about 4.3 megabytes, less than a seventh the size. When you are preparing audio for an iOS application, submitting music to Apple Music for distribution, or creating audio that will be streamed over a cellular connection, WAV is simply too large.

AAC is the preferred streaming and distribution format on Apple platforms and is widely supported across Android, web browsers, and modern media players. Apple Music, Spotify, Amazon Music, and most major streaming services transcode submitted audio to AAC for delivery. If you are developing an iOS app and embedding sound effects or music, Xcode and AVFoundation work most efficiently with AAC files. Podcast platforms and audiobook distribution services also accept AAC through the M4A container.

Converting WAV to AAC applies lossy compression for the first time to the uncompressed source, which means this is the most favorable scenario for AAC encoding. Unlike converting between two lossy formats, encoding a WAV to AAC at 256 kbps produces output that is essentially transparent, meaning the quality difference compared to the WAV is inaudible to most listeners even on high-quality playback systems. Stereo imaging, frequency response, and dynamic range are all well-preserved. The output file is immediately compatible with iTunes, iPhones, iPads, and all major audio platforms.

Typical sizes (3-minute song): WAV 30–50 MB → AAC 2–5 MB.

AAC output is encoded at 192 kbps.

Going from lossless WAV to lossy AAC removes detail you cannot get back — keep the original if you may need it.