Audio Formats Explained: The Complete Guide
A complete guide to every major audio format. Compare MP3, WAV, FLAC, AAC, OGG, AIFF, WMA, and M4A side by side.
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Eight major audio formats. Each with strengths. Each with tradeoffs. Here's the complete picture.
The Lossy Formats
MP3
The universal format. Plays everywhere. Quality is good at 256+ kbps. Every device supports it. Choose MP3 when compatibility matters most. Convert WAV to MP3 for easy sharing.
AAC (M4A)
Apple's favorite. Better quality than MP3 at the same bitrate. iTunes and Apple Music use it. Most modern devices support it. Choose AAC when quality per bit matters and your audience is on modern hardware.
OGG Vorbis
The open-source option. Better compression than MP3. Used in games and by Spotify. Choose OGG for web apps, games, or when licensing matters.
WMA
Microsoft's format. Once competitive, now obsolete. Limited support outside Windows. If you have WMA files, convert them to MP3. Don't create new WMA files.
The Lossless Formats
WAV
Uncompressed audio. Perfect quality. Huge files. Universal compatibility. The standard for recording and editing. About 10 MB per minute at CD quality.
FLAC
Lossless compression. Perfect quality at 50-60% of WAV's size. Open source. Great metadata support. The best choice for archiving music. Convert WAV to FLAC to save storage.
AIFF
Apple's uncompressed format. Functionally identical to WAV. Better metadata support than WAV in the original spec. Common in Mac-based studios. Convert AIFF to MP3 for sharing.
ALAC
Apple Lossless Audio Codec. Like FLAC but for Apple's ecosystem. Native support in iTunes and iOS. Less widely supported outside Apple.
Quick Comparison
| Format | Type | Quality | Size | Compatibility |
|---|---|---|---|---|
| WAV | Lossless | Perfect | Huge | Universal |
| FLAC | Lossless | Perfect | Large | Very good |
| AIFF | Lossless | Perfect | Huge | Good (Mac) |
| MP3 | Lossy | Good-Excellent | Small | Universal |
| AAC/M4A | Lossy | Good-Excellent | Small | Very good |
| OGG | Lossy | Good-Excellent | Small | Good |
| WMA | Lossy | Good-Excellent | Small | Poor |
Choosing the Right Format
For music production: WAV or AIFF. Uncompressed for recording and editing.
For archiving: FLAC. Lossless compression saves real space.
For sharing: MP3. Universal compatibility.
For Apple ecosystem: M4A/AAC. Better quality than MP3, native support.
For web/games: OGG. Open source, efficient, no royalties.
For podcasts: MP3. Industry standard for RSS feeds.
The Conversion Workflow
Start with the best quality source you have. Convert down as needed.
Have FLAC files that won't play? Convert FLAC to MP3. Have M4A files from iTunes? Convert M4A to MP3 for universal playback. Have OGG files from a game project? Convert OGG to MP3. Have AAC files? Convert AAC to MP3.
The pattern is clear. MP3 is the lingua franca. Convert to it when you need something that plays everywhere.
One Rule to Remember
Archive in lossless. Distribute in lossy. Keep your source files pristine. Create compressed copies for distribution. That's the only rule that matters.
Every other decision -- which lossy format, what bitrate, which lossless codec -- follows from your specific situation. There's no single best format. There's only the best format for your needs right now.