Audio Formats Compared: MP3, WAV, FLAC, and More

I have a vivid memory of the first time I ripped a CD to my computer. I used some free software that defaulted to a format I’d never heard of, and when I tried to play the files on my portable MP3 player, nothing worked. That was my introduction to the confusing world of audio formats — a world where three letters can mean the difference between a file that plays everywhere and one that plays nowhere.

Since then I’ve spent more hours than I care to admit converting audio files, testing quality, and learning which formats work best in which situations. Here’s everything I wish someone had told me at the start.

MP3: The Universal Standard

MP3 is the most recognized audio format in the world, and for good reason. It was designed to compress CD-quality audio down to about a tenth of its original size while keeping the sound acceptable to most listeners. It does this by discarding audio data that the human ear is unlikely to miss — a technique called perceptual coding. The result is a file small enough to email, stream, or store by the thousands.

The key metric with MP3 is bitrate, measured in kilobits per second (kbps). Higher bitrates mean better quality and larger files. I’ve found that 128 kbps is the minimum acceptable quality for spoken word content like podcasts. For music, I aim for 192 kbps or 256 kbps. At those rates, I can’t reliably distinguish the MP3 from the original CD in a blind test.

MP3’s weakness is that the compression is lossy and generational. Every time you decode and re-encode an MP3, you introduce new artifacts. For archiving, I avoid MP3 entirely. But for distribution and everyday listening, it’s still the king.

WAV: The Uncompressed Heavyweight

WAV is about as simple as an audio format gets. It stores raw, uncompressed audio samples, which means the file is an exact digital copy of the original recording. No data is thrown away, no clever compression tricks are used. The upside is perfect fidelity. The downside is massive file size: a one-minute stereo WAV file at CD quality is about 10 MB. An MP3 of the same length at 192 kbps is about 1.4 MB.

I use WAV when I’m recording or editing audio. If I’m recording a voiceover, I capture it as WAV so I have the cleanest possible source material. I only convert to MP3 or another compressed format when I’m ready to share the final product.

WAV is also useful as a fallback. Some audio extraction tools, including GhostConvert, will try to encode to MP3 first, and if that fails, they’ll output WAV instead. That way you never lose your audio, even if the encoder runs into trouble with a particular file.

FLAC: Lossless and Compact

FLAC (Free Lossless Audio Codec) is the sweet spot for people who want perfect audio quality without the enormous file sizes of WAV. It uses lossless compression, meaning the audio is restored bit-for-bit when decoded, but the file size is typically 50–60% of an equivalent WAV. I’ve been slowly converting my CD collection to FLAC for archival storage, and I can fit significantly more albums on the same hard drive compared to WAV.

The main downside of FLAC is compatibility. While most modern media players support it, some older devices and many car stereos don’t. Apple’s ecosystem, in particular, has been slow to adopt FLAC natively — though recent versions of iOS and macOS do support it.

For everyday listening on the go, I still use MP3. For my home library, FLAC. It’s a simple balance between convenience and quality.

AAC and M4A: Apple’s Choice

AAC (Advanced Audio Coding) was designed as the successor to MP3, and it generally sounds better at the same bitrate. Apple adopted AAC as the default format for iTunes and continues to use it for Apple Music. Files with the .m4a extension are usually AAC audio wrapped in an MP4 container.

If you’re deep in the Apple ecosystem, AAC is a great choice. It’s well-supported across devices, offers good quality at small sizes, and handles high frequencies better than MP3. But outside Apple’s world, MP3 still has wider compatibility.

When I’m extracting audio from a video that originated on an iPhone, the audio track is often AAC. GhostConvert can handle that natively, converting it to MP3 or WAV as needed.

OGG, WMA, and the Rest

OGG Vorbis is an open-source format that competes with MP3 and AAC in quality. It’s popular in gaming and with Linux users. Windows Media Audio (WMA) was Microsoft’s answer to MP3 but has largely fallen out of favor. Both are supported by most conversion tools, though you’re unlikely to encounter them unless you’re working with older files.

My advice: don’t overthink it. For most people, MP3 at 192–256 kbps is the safe bet. Use WAV for editing, FLAC for archiving, and let the conversion tool handle the rest.