Lossless Audio Explained: FLAC vs ALAC vs APE vs WAV

A lossless codec compresses the raw PCM audio data (the same data on a CD) so it takes up less space on disk, but when you decode it you get back the exact original samples, bit for bit. Lossy formats like MP3 and AAC permanently discard parts of the audio that psychoacoustic models deem less audible. Lossless formats don't — the decoded output is mathematically identical to the source.

That distinction matters for archiving, production work, and anyone who wants to convert to different lossy formats later without generational quality loss. If you transcode an MP3 to AAC, you're encoding an already degraded signal. If you transcode FLAC to AAC, you're encoding from the original.

FLAC (Free Lossless Audio Codec) is an open-source format developed by Xiph.org, the same group behind Ogg Vorbis and Opus. It's been around since 2001 and has become the default lossless format for most of the audio world.

Compatibility is FLAC's biggest strength. Android plays it natively. Windows has had native FLAC support since Windows 10. VLC, foobar2000, MusicBee, Winamp, Kodi, Plex — they all handle FLAC without plugins. Even Apple finally added FLAC playback in iOS 11 and macOS High Sierra, though iTunes/Apple Music still won't import FLAC into your library directly.

On the technical side, FLAC supports up to 32-bit/655,350 Hz audio (way beyond what any real recording uses), has built-in error detection via MD5 checksums, and handles Vorbis comment tags for metadata — artist, album, cover art, replay gain, the works. Compression ratios typically land between 50-60% of the original WAV size, and encoding/decoding is fast even on modest hardware.

ALAC (Apple Lossless Audio Codec) lives inside an M4A container — the same MPEG-4 Part 14 wrapper that AAC uses. Apple created it in 2004 and open-sourced it in 2011, but it's still primarily an Apple ecosystem format.

If your entire workflow is Apple — iPhone, Mac, HomePod, Apple Music, iTunes — ALAC is the path of least resistance. iTunes handles ALAC natively, AirPlay streams it without transcoding, and your whole library stays inside the Apple Music app without third-party players.

Outside Apple? It's a different story. Android added ALAC support relatively late, and while VLC and foobar2000 play it fine, plenty of standalone audio hardware — car stereos, network streamers, some DAPs (digital audio players) — only support FLAC for lossless. ALAC's compression ratios are nearly identical to FLAC, so there's no file size advantage either way.

APE (Monkey's Audio) squeezes files about 5-10% smaller than FLAC. That's its one advantage, and for large collections it adds up — shaving a few gigs off a multi-terabyte library.

The tradeoff is brutal though. APE decoding is CPU-intensive, which means some portable players and embedded devices struggle with it or refuse it entirely. foobar2000 on Windows handles APE well. VLC supports it. Beyond that, support drops off fast — most streaming servers, car stereos, and smart speakers won't touch it.

APE also has no native streaming support (you can't seek efficiently in the middle of a large file) and its error resilience is poor — a few corrupt bytes can make an entire file unplayable, whereas FLAC can usually recover and keep playing past the damaged section.

WAV (Waveform Audio File Format) is Microsoft's container for raw PCM data, based on the RIFF specification. It's uncompressed, which means a typical CD-quality stereo track (16-bit, 44.1 kHz) eats about 10 MB per minute.

WAV has near-universal playback support — every OS, every player, every piece of audio hardware can handle it. It's the standard interchange format in recording studios, and most DAWs (Pro Tools, Logic, Ableton, Reaper) work with WAV natively.

The downside is obvious: file size. A 60-minute album takes roughly 600 MB as WAV versus ~300 MB as FLAC. And WAV's metadata support is limited and inconsistent. The RIFF INFO chunk can store basic tags, but most players ignore them, and cover art support is essentially nonexistent. You end up with a folder full of files named Track01.wav through Track12.wav with no embedded info about what they actually are.

For personal listening and archiving, FLAC wins. It plays everywhere that matters, compresses well, handles metadata properly, and is the format most download stores and streaming services use for lossless delivery (Tidal, Qobuz, Deezer HiFi all use FLAC).

If you're an Apple-only household and you want everything inside Apple Music, go with ALAC. You can always convert to FLAC later since both are lossless — the conversion is bit-perfect, just repackaging the same audio data.

Use WAV for production work — sending stems to a mix engineer, bouncing tracks in your DAW, or mastering. WAV is the lingua franca of professional audio.

APE? Unless you're extremely tight on storage and only play files through foobar2000 on a Windows PC, skip it. The compatibility headaches aren't worth the 5% size savings.

The major streaming platforms have picked their sides. Tidal, Qobuz, and Deezer HiFi all stream in FLAC — and Tidal's MQA-encoded streams are also delivered inside a FLAC container. Apple Music uses ALAC. Amazon Music HD uses FLAC. Spotify has been promising a HiFi tier for years and still hasn't shipped one as of mid-2026.

If you're downloading music for offline listening from any of these services, the files land on your device in the service's native format. Tidal downloads are FLAC, Apple Music downloads are ALAC, and so on. If you cancel your subscription, most services revoke access to downloads — but if you own files outright from a store like Bandcamp or Qobuz, those FLAC files are yours permanently.

High-resolution audio (anything above CD quality's 16-bit/44.1 kHz) adds another dimension. FLAC supports up to 32-bit/655,350 Hz. ALAC goes up to 32-bit/384 kHz. WAV handles whatever bit depth and sample rate you throw at it. APE supports up to 24-bit/192 kHz in most implementations.

For practical purposes, all four formats cover the hi-res range you'll actually encounter — 24-bit/96 kHz and 24-bit/192 kHz are the most common hi-res distributions. The format choice doesn't limit the resolution; it's about compatibility and features.

One thing worth knowing: not all DACs (digital-to-analog converters) accept all sample rates natively. If your USB DAC maxes out at 96 kHz and you feed it a 192 kHz FLAC file, the player software downsamples on the fly. The file format isn't the bottleneck — your hardware is. Check your DAC's specs before paying extra for 192 kHz files.

Since all four formats preserve the original audio data, converting between them is genuinely lossless — no quality loss whatsoever. Going from FLAC to ALAC and back produces a file with identical decoded audio.

The iFormat audio converter handles all four formats. Upload your files, pick the target format, and download. If you've got APE or ALAC files that won't play on your device, converting to FLAC usually solves the problem instantly.

Can you hear the difference between FLAC and WAV?
No. Both contain identical audio data once decoded. FLAC simply compresses the data for storage; when it's played back, the exact same PCM samples reach your DAC. Any blind test will confirm they're indistinguishable.

Does FLAC sound better than MP3 at 320 kbps?
FLAC preserves everything. A 320 kbps MP3 is very good, but it's still throwing away data. On resolving headphones you might notice the difference in high-frequency detail or stereo imaging. For casual listening through earbuds or laptop speakers? Probably not.

Why does Apple Music show 'Lossless' but use ALAC?
Apple chose ALAC as their lossless codec and wraps it in the M4A container. When Apple Music shows the 'Lossless' badge, it's streaming ALAC — up to 24-bit/48 kHz for standard Lossless, and up to 24-bit/192 kHz for Hi-Res Lossless.

Is it safe to delete WAV files after converting to FLAC?
Yes. FLAC is mathematically lossless. You can verify by decoding the FLAC back to WAV and doing a binary comparison — the PCM data will be identical. Many people do exactly this to reclaim disk space after ripping CDs.

What about AIFF?
AIFF is Apple's uncompressed format, roughly equivalent to WAV. It has slightly better metadata support via ID3 tags but is otherwise the same story: huge files, universal playback, no compression. Use it if your DAW prefers it; otherwise FLAC covers you better.