Audio Format Guide: MP3 vs AAC vs FLAC vs WAV
Audio formats balance file size against sound quality. This comparison covers the most common formats and helps you choose the right one for music, podcasts, voice recordings, and professional audio production.
Key Takeaways
- Audio formats fall into two categories: lossy (which discard inaudible data to reduce size) and lossless (which preserve every bit of the original).
- MP3 has been the standard compressed audio format since the late 1990s.
- AAC (Advanced Audio Coding) achieves better sound quality than MP3 at the same bitrate.
- FLAC compresses audio to about 50-70% of the original size with zero quality loss.
- WAV files contain uncompressed PCM audio data.
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Lossy vs Lossless
Audio formats fall into two categories: lossy (which discard inaudible data to reduce size) and lossless (which preserve every bit of the original). The right choice depends on your use case and audience.
MP3: Universal Compatibility
MP3 has been the standard compressed audio format since the late 1990s. At 128 kbps it's adequate for speech; at 192-320 kbps it's good for music.
Best for: Maximum compatibility, podcast distribution, email attachments.
AAC: Better Quality at Same Bitrate
AAC (Advanced Audio Coding) achieves better sound quality than MP3 at the same bitrate. It's the default format for Apple Music, YouTube, and most streaming services.
Best for: Streaming, mobile audio, iTunes/Apple ecosystem.
FLAC: Lossless Compression
FLAC compresses audio to about 50-70% of the original size with zero quality loss. It's the preferred format for audiophiles and music archival.
Best for: Music archival, audiophile listening, master recordings.
WAV: Uncompressed Standard
WAV files contain uncompressed PCM audio data. They're large but require no decoding, making them ideal for audio editing and professional workflows.
Best for: Audio editing, professional recording, sound design.
Format Comparison
| Format | Type | Typical Size (per minute) | Quality |
|---|---|---|---|
| WAV | Uncompressed | ~10 MB | Perfect |
| FLAC | Lossless | ~5-7 MB | Perfect |
| MP3 320 | Lossy | ~2.5 MB | Excellent |
| AAC 256 | Lossy | ~2 MB | Excellent |
| MP3 128 | Lossy | ~1 MB | Good |
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