The Differences Between Audio Formats: MP3, FLAC, WAV, AIFF, M4A & OGG
Learn the differences between audio formats and how to choose the best format for sound quality & stem splitting.
Songs and recordings come in many different formats, and they are far from equal. If you're recording, mixing, mastering, or simply listening, then the format you choose shapes everything: file size, playback compatibility, and the fidelity of every note. This guide covers the six most common audio formats, backed by verified specs and real-world numbers, so you can make the right call every time.
What's the Difference Between Lossless vs. Lossy Compression?
Every audio format falls into one of two camps.
Lossless formats compress (or don't compress) audio in a way that preserves every bit of the original recording. You can convert between lossless formats repeatedly with zero quality degradation. WAV, AIFF, and FLAC are lossless.
Lossy formats achieve much smaller files by permanently discarding audio data i.e. frequencies the human ear is least likely to notice. Once information is gone, it cannot be recovered. MP3, M4A, and OGG are lossy.
File Size at a Glance
| Format | Type | Typical size — 3-min stereo track | Relative to WAV |
|---|---|---|---|
| WAV (16-bit/44.1 kHz) | Uncompressed lossless | ~31 MB | 100% |
| AIFF (16-bit/44.1 kHz) | Uncompressed lossless | ~31 MB | ~100% |
| FLAC | Compressed lossless | ~13–19 MB | 40–60% |
| MP3 (320 kbps) | Compressed lossy | ~7 MB | ~23% |
| M4A (256 kbps AAC) | Compressed lossy | ~5.5 MB | ~18% |
| OGG (320 kbps Vorbis) | Compressed lossy | ~7 MB | ~23% |
Source: File size formula for uncompressed audio = duration (s) × sample rate × bit depth ÷ 8 × channels. WAV 3-min stereo at 44.1 kHz/16-bit: 180 × 44,100 × 2 ÷ 8 × 2 ≈ 31.75 MB. Lossy sizes calculated at stated bitrates.
WAV
| Extension | .wav |
| Type | Uncompressed lossless |
| Developed by | IBM & Microsoft |
| Year introduced | 1991 |
| Max bit depth | 32-bit float |
| Typical bitrate | 1,411 kbps (CD quality, 16-bit/44.1 kHz) |
WAV (Waveform Audio File Format) is the gold standard in studio recording. It stores audio in uncompressed PCM form, so no data is discarded, no quality is compromised. Its key advantage over other lossless formats is support for embedded SMPTE timecode, which enables frame-accurate synchronization across tracks and DAWs, essential for film, TV, and collaborative projects.
Who needs WAV: Recording engineers, producers, film/TV composers, anyone who needs to edit, process, or re-master audio.
Key limitation: Size. A one-hour stereo recording at 44.1 kHz/24-bit occupies approximately 950 MB. Spotify's own artist upload spec (as of 2025) requires WAV or FLAC at minimum 24-bit/44.1 kHz for master delivery.
AIFF
| Extension | .aif, .aiff |
| Type | Uncompressed lossless |
| Developed by | Apple |
| Year introduced | 1988 |
| Max bit depth | 32-bit |
| Typical bitrate | 1,411 kbps (CD quality, 16-bit/44.1 kHz) |
AIFF (Audio Interchange File Format) is Apple's answer to WAV. Both formats store the same CD-quality audio (16-bit, 44.1 kHz) in uncompressed PCM, and the sonic difference between a WAV and an AIFF of the same recording is exactly zero. The structural difference is byte order: WAV uses little-endian, AIFF uses big-endian, a technical detail that is invisible in practice.
The one functional difference: AIFF does not natively embed timecode, making WAV the safer choice for synchronization-critical workflows. For everything else — archiving, editing, mixing — both formats are interchangeable.
Who needs AIFF: macOS and Logic Pro users who prefer Apple's native ecosystem.
FLAC
| Extension | .flac |
| Type | Compressed lossless |
| Developed by | Xiph.Org Foundation |
| Year introduced | 2001 |
| Max bit depth | 32-bit |
| Compression vs WAV | 40–60% smaller, no quality loss |
FLAC (Free Lossless Audio Codec) is an open-source format that achieves lossless compression the same way ZIP compresses documents: it reduces file size without discarding any data. When a player decodes FLAC, it reconstructs the exact original audio bit-for-bit.
A 50 MB WAV file becomes approximately 20–30 MB as FLAC with no audible or measurable difference. FLAC also supports metadata tagging, cover art, and fast seeking. It is the preferred delivery format for Bandcamp, Tidal, Deezer, Qobuz, Amazon Music Unlimited, and Spotify's artist upload portal.
Who needs FLAC: Anyone building a high-quality personal library, archiving recordings, or distributing to lossless streaming platforms. It offers the best balance of quality and storage among all formats.
MP3
| Extension | .mp3 |
| Type | Compressed lossy |
| Developed by | Fraunhofer IIS (Germany) |
| Standard published | 1993 (MPEG-1), file extension adopted July 14, 1995 |
| Bitrate range | 32 kbps – 320 kbps |
| Max bit depth | 16-bit |
MP3 (MPEG-1 Audio Layer III) was developed by researchers at Germany's Fraunhofer Institute beginning in 1987 and standardized in 1993. The name ".mp3" was chosen in an internal email poll at Fraunhofer IIS on July 14, 1995. The format became the defining codec of the internet era because it could compress audio to roughly 10% of the original WAV file size while remaining listenable on consumer hardware.
The quality trade-off: MP3 permanently removes audio data using a psychoacoustic model, prioritising the sounds humans are most likely to notice. At 128 kbps, artefacts are audible on trained ears; at 320 kbps, casual listeners rarely distinguish MP3 from lossless in blind tests. The hard ceiling is 16-bit resolution, making it unsuitable for professional production (which requires at least 24-bit).
Streaming platforms use MP3 or better:
- Spotify Free: up to 160 kbps (Ogg Vorbis)
- Spotify Premium: up to 320 kbps (Ogg Vorbis)
- Apple Music: 256 kbps AAC (standard), up to 24-bit/192 kHz lossless
- YouTube Music Premium: 256 kbps
Who needs MP3: Consumer listening, podcast distribution, web audio, platforms with strict file-size requirements. Not appropriate for recording, mixing, or mastering.
M4A
| Extension | .m4a, .mp4 |
| Type | Compressed lossy (AAC codec) |
| Developed by | Apple / MPEG group |
| Codec | AAC (Advanced Audio Coding) |
| Typical bitrate | 128–320 kbps |
M4A is a container format using AAC (Advanced Audio Coding), which was designed as the successor to MP3. At equivalent bitrates, AAC consistently produces better sound quality than MP3 — a 256 kbps M4A is generally considered superior to a 320 kbps MP3 in listening tests. It is the native format for the iTunes Store, Apple Music, and iOS.
Apple Music streams at 256 kbps AAC by default, which, despite the lower number, is broadly comparable to or better than Spotify's 320 kbps Ogg Vorbis due to AAC's more efficient compression algorithm.
Who needs M4A: Users in the Apple ecosystem, anyone wanting better quality-per-kilobyte than MP3, podcast producers targeting Apple Podcasts.
OGG
| Extension | .ogg, .oga, .opus |
| Type | Compressed lossy |
| Developed by | Xiph.Org Foundation |
| Codec | Vorbis (audio), Opus (low-latency audio) |
| Bitrate range | Variable (typically 45–500 kbps) |
OGG is a free, open-source container format developed by Xiph.Org, the same organisation behind FLAC. The most common audio codec inside OGG containers is Vorbis. OGG Vorbis produces better quality than MP3 at the same bitrate, and smaller files at equivalent quality. Spotify Premium streams using OGG Vorbis at up to 320 kbps.
OGG's main limitation is device support: it is not natively playable on iOS, Safari, or some older hardware without additional software.
Who needs OGG: Web developers (HTML5 audio), Spotify users and developers, game audio engineers. If your device or platform supports OGG, choose it over MP3 for the same storage cost with better quality.
Side-by-Side Comparison Table
| Format | Type | Bit depth | Typical bitrate | Relative file size | Best for |
|---|---|---|---|---|---|
| WAV | Uncompressed lossless | Up to 32-bit | 1,411 kbps (CD) | 100% | Studio recording, film, sync |
| AIFF | Uncompressed lossless | Up to 32-bit | 1,411 kbps (CD) | ~100% | macOS/Logic workflow, archiving |
| FLAC | Compressed lossless | Up to 32-bit | 400–1,400 kbps | 40–60% | Libraries, distribution, archiving |
| MP3 | Compressed lossy | Up to 16-bit | 128–320 kbps | ~10% | Consumer playback, web, podcasts |
| M4A | Compressed lossy | Up to 24-bit | 128–320 kbps | ~9% | Apple ecosystem, better MP3 alt |
| OGG | Compressed lossy | Up to 32-bit | 45–500 kbps | ~10% | Web, Spotify, open-source projects |
Which Format Should You Choose?
By use case
| Goal | Recommended format | Why |
|---|---|---|
| Recording or mixing music | WAV (24-bit/44.1 kHz minimum) | Timecode support, universal DAW compatibility, no quality loss |
| Archiving a personal music library | FLAC | Lossless quality, 40–60% smaller than WAV, widely supported |
| Uploading to Spotify / streaming platforms | WAV or FLAC (24-bit/44.1 kHz) | Platform requirement; platform handles re-encoding |
| Consumer listening across devices | MP3 (320 kbps) or M4A (256 kbps) | Near-universal compatibility, small size |
| Apple devices / iTunes | M4A | Native format, better quality than MP3 at same size |
| Web / HTML5 audio | OGG + MP3 fallback | OGG for Chrome/Firefox, MP3 fallback for Safari/iOS |
| Stem splitting and audio separation | WAV or FLAC input | LALAL.AI outputs stems in the same format as your input |
Split Any Format With LALAL.AI, No Quality Loss
FAQ
What is the highest quality audio format?
WAV and AIFF are the highest quality formats because they are completely uncompressed. FLAC is equivalent in actual audio quality but smaller in file size. There is no measurable difference between a WAV and a FLAC version of the same recording.
Is MP3 good enough for listening?
At 320 kbps, most listeners cannot distinguish MP3 from lossless in controlled blind tests using typical consumer equipment. However, MP3 is permanently lossy, so if you later want to edit or re-master the audio, quality is already degraded. Always archive originals as WAV or FLAC.
Does FLAC sound better than WAV?
No. Both are lossless and bit-for-bit identical in audio content. FLAC is simply compressed (like a ZIP file) so it is 40–60% smaller on disk. Decoding FLAC reconstructs the exact same PCM data as the original WAV.
What format does Spotify use for streaming?
Spotify streams audio using the Ogg Vorbis codec: up to 160 kbps for free users and up to 320 kbps for Premium subscribers. For artist uploads, Spotify requires FLAC or WAV at 24-bit/44.1 kHz or higher.
Should I upload WAV or FLAC to streaming platforms?
Either is fine since platforms like Spotify, Apple Music, and Tidal re-encode your master to their own format regardless. Both WAV and FLAC are lossless, so quality going into the encoding pipeline is identical. FLAC is preferable if upload speed or storage matters.
What is OGG and why don't I hear about it much?
OGG is a free, open-source container format. It produces better quality than MP3 at the same file size but lacks native support on iOS, Safari, and some hardware players. It is widely used behind the scenes: Spotify streams OGG Vorbis but rarely appears as a file format in consumer software.
What audio format should I use for stem splitting?
Use the highest-quality source available, ideally WAV or FLAC at 24-bit. LALAL.AI returns separated stems in the same format as your input, so a lossless input means lossless stems.
Can I convert MP3 back to WAV and recover quality?
No. Converting a lossy format to a lossless one does not restore discarded audio data. The resulting WAV file will be larger but will contain the same artefacts and missing information as the original MP3. Always work from the highest-quality source available.
What is the difference between sample rate and bit depth?
Sample rate (measured in kHz) controls how many audio snapshots are captured per second — 44.1 kHz is CD quality, capturing 44,100 samples per second. Bit depth (measured in bits) controls the dynamic range and precision of each sample — 16-bit covers 96 dB of dynamic range, 24-bit covers 144 dB. Both matter for professional work; 24-bit/44.1 kHz is the minimum recommended for recording and distribution.
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