Audio Format Comparison — MP3, AAC, FLAC, WAV, OGG, and More

There are way too many audio formats, and most people have no idea why they exist or which one to pick. This guide cuts through the confusion with a master comparison table and practical recommendations.

The Master Table

Format	Type	Typical Bitrate	Quality	File Size (4-min song)	Best For
WAV	Uncompressed	1,411 kbps (CD)	Reference	~40 MB	Editing, archival
AIFF	Uncompressed	1,411 kbps (CD)	Reference	~40 MB	Mac editing workflows
FLAC	Lossless compressed	~900 kbps	Identical to source	~25 MB	Archival, audiophile listening
ALAC	Lossless compressed	~900 kbps	Identical to source	~25 MB	Apple ecosystem archival
MP3	Lossy	128–320 kbps	Good to very good	4–10 MB	Universal compatibility
AAC	Lossy	128–256 kbps	Better than MP3 at same bitrate	3–8 MB	Streaming, Apple devices
OGG Vorbis	Lossy	96–500 kbps	Comparable to AAC	3–8 MB	Open source, gaming
Opus	Lossy	32–510 kbps	Best lossy codec available	2–8 MB	VoIP, streaming, low-bitrate
WMA	Lossy	128–320 kbps	Comparable to MP3	4–10 MB	Legacy Windows apps
M4A	Container (usually AAC)	Varies	Varies	Varies	iTunes, Apple ecosystem

Lossy vs Lossless: What's Actually Lost?

Lossy codecs (MP3, AAC, OGG, Opus) discard audio information that psychoacoustic models predict you won't notice. Quiet sounds masked by loud sounds, frequencies at the edge of human hearing, subtle details during complex passages.

At high bitrates (256+ kbps), most people genuinely cannot tell the difference between lossy and lossless in a blind test. At lower bitrates (below 128 kbps), compression artifacts become audible — a "swirly" quality on cymbals, smeared transients, loss of stereo imaging.

Lossless formats (FLAC, ALAC) compress the file size (typically 50-60% of WAV) without discarding any data. You get the exact original audio back when decoding.

Which Format Should You Use?

For archival and mastering: FLAC. It's lossless, widely supported, open source, and roughly half the size of WAV. Keep FLAC as your master and convert to anything else as needed. For everyday listening: AAC at 256 kbps or MP3 at 320 kbps. Both are "transparent" for most listeners, meaning indistinguishable from the source in normal conditions. For podcasts and voice: Opus at 64-96 kbps or MP3 at 128 kbps. Voice doesn't need the bandwidth that music does. Opus is technically superior but MP3 has better compatibility with older podcast apps. For gaming and apps: OGG Vorbis or Opus. Both are open source (no licensing fees), efficient, and widely supported in game engines. For professional editing: WAV or AIFF. Uncompressed means no decode step, which keeps editing workflows fast. Convert to a distribution format when you're done.

The MP3 Question

MP3 is the cockroach of audio formats — it refuses to die, and honestly, that's fine. Its patents expired in 2017, so it's now free to use everywhere. Every device, app, and operating system on earth plays MP3.

Is it the best lossy codec? No. AAC and Opus both deliver better quality at the same bitrate. But MP3 at 320 kbps is good enough for almost anything, and compatibility is unbeatable.

Converting Between Formats

Going from lossless to lossy is fine — you're creating a compressed copy. Going from lossy to lossless is pointless — you can't recover discarded data by putting it in a bigger container. And transcoding between lossy formats (MP3 to AAC) degrades quality with each generation.

Always convert from your highest-quality source. MyPDF's audio converter supports all the formats listed above and handles batch conversion when you need to process an entire library.

Related Tools

• Audio Converter — Convert between all major audio formats
• Video to Audio — Extract audio tracks from video files
• Compress Audio — Reduce file sizes for sharing and streaming