Audio Format Guide: MP3, WAV, FLAC, AAC, OGG and M4A

Six audio formats dominate everyday use. Each has a specific reason to exist. Understanding the trade-offs takes about five minutes and will stop you from either wasting storage on unnecessarily large files or losing quality when it matters.

MP3 — the universal default

MP3 is lossy but at 192 kbps, it's transparent for virtually all listeners on consumer equipment. It plays on every device, every platform, every car stereo, every cheap Bluetooth speaker ever made. Use it for final delivery of anything meant for listening.

WAV — the production standard

WAV is uncompressed PCM audio. It's large (about 10× MP3 at the same duration) but lossless. Every DAW, video editor, and professional audio tool prefers WAV source files. Use it when you're still editing, processing, or plan to use the audio in another production context.

FLAC — compressed lossless

FLAC (Free Lossless Audio Codec) achieves roughly 50–60% of WAV's file size with zero quality loss. Think of it as a ZIP file for audio. It's perfect for archiving music collections where you want lossless quality without the full WAV file size. FLAC isn't universally supported (notably absent from iTunes and some streaming platforms), but it works everywhere that matters for offline use.

AAC — the MP3 successor

AAC (Advanced Audio Coding) achieves better quality than MP3 at the same bitrate — typically 128 kbps AAC sounds as good as 192 kbps MP3. It's the default format for Apple Music, YouTube, and most modern streaming services. If your target is Apple devices or streaming platforms, AAC is a smarter choice than MP3.

OGG Vorbis — the open-source option

OGG Vorbis is an open-source lossy format comparable to MP3 and AAC in quality. It has no licensing restrictions, which made it popular in gaming and open-source software. For everyday use, OGG offers no meaningful advantage over AAC. It's mainly relevant if you're working on a project with open-source licensing requirements.

M4A — AAC in an Apple container

M4A is simply AAC audio wrapped in an MPEG-4 container. It's what you get when you export from iTunes or record with an Apple device. Technically identical to AAC; the difference is just the file extension and container format. Convert to MP3 or AAC if recipients aren't on Apple devices.