Audio File Formats Explained: MP3, WAV, AAC, OGG, FLAC
The 5 most common audio formats
There are dozens of audio formats, but you'll encounter these five most often. Each has different strengths, and choosing the right one depends on what you're doing with the audio.
MP3
MP3 (MPEG-1 Audio Layer III) is the most widely supported audio format in the world. Every device, browser, and app can play MP3 files.
| Property | Detail |
|---|---|
| Compression | Lossy |
| Typical bitrate | 128–320 kbps |
| File size (10 min) | ~10 MB |
| Best for | Sharing, streaming, universal compatibility |
When to use MP3:
- Sharing audio files with anyone
- Uploading to platforms that accept audio
- Saving storage space on your device
- When you need guaranteed compatibility
Drawbacks: Lossy compression discards some audio data. At low bitrates (under 128 kbps), artifacts become noticeable, especially in cymbals and high-frequency sounds.
WAV
WAV (Waveform Audio File Format) is an uncompressed format that stores audio exactly as it was recorded. It's the standard for professional audio production.
| Property | Detail |
|---|---|
| Compression | None (uncompressed) |
| Typical bitrate | 1,411 kbps (CD quality) |
| File size (10 min) | ~100 MB |
| Best for | Audio editing, professional production |
When to use WAV:
- Recording and editing audio (before final export)
- Professional music production
- When you need zero quality loss
- Archiving original recordings
Drawbacks: Extremely large file sizes. A 10-minute recording is ~100 MB. Not practical for sharing or streaming.
AAC
AAC (Advanced Audio Coding) is the successor to MP3. It's the default format for Apple devices, YouTube, and many streaming services.
| Property | Detail |
|---|---|
| Compression | Lossy |
| Typical bitrate | 128–256 kbps |
| File size (10 min) | ~9 MB |
| Best for | Apple ecosystem, streaming, better quality than MP3 at same size |
When to use AAC:
- Recording on iPhone (default format)
- Uploading to YouTube
- Streaming applications
- When you want better quality than MP3 at the same bitrate
Drawbacks: Slightly less universal than MP3. Some older devices and niche software may not support it.
OGG
OGG (Ogg Vorbis) is an open-source alternative to MP3 and AAC. It's used by Spotify for streaming and by many games for in-game audio.
| Property | Detail |
|---|---|
| Compression | Lossy |
| Typical bitrate | 112–500 kbps |
| File size (10 min) | ~9 MB |
| Best for | Streaming, gaming, open-source projects |
When to use OGG:
- Web audio (HTML5
<audio>supports it) - Game development
- When you want a patent-free format
- Spotify uploads (they re-encode anyway)
Drawbacks: Not supported by all devices. Some older Apple products can't play OGG files natively.
FLAC
FLAC (Free Lossless Audio Codec) compresses audio without any quality loss. It's like a ZIP file for audio — the original data is perfectly preserved.
| Property | Detail |
|---|---|
| Compression | Lossless |
| Typical bitrate | ~800 kbps |
| File size (10 min) | ~50 MB |
| Best for | Music archiving, audiophile listening |
When to use FLAC:
- Archiving a music collection
- Listening on high-end audio equipment
- When you want perfect quality with some space savings over WAV
Drawbacks: Files are still 3–5× larger than MP3. Not supported by all mobile players. Overkill for casual listening.
Format comparison at a glance
| Format | Quality | File Size | Compatibility | Best Use |
|---|---|---|---|---|
| MP3 | Good | Small | Universal | Sharing, everyday use |
| WAV | Perfect | Very large | Universal | Editing, production |
| AAC | Very good | Small | Very good | Apple, streaming |
| OGG | Very good | Small | Good | Web, gaming |
| FLAC | Perfect | Medium | Good | Archiving, audiophile |
How to convert between formats
If your audio is in the wrong format, converting is simple. Use our free audio converter to switch between MP3, WAV, AAC, OGG, and FLAC — right in your browser.
Common conversions:
- WAV to MP3 — Reduce a 100 MB recording to ~10 MB for sharing
- FLAC to MP3 — Make your music collection portable
- AAC to MP3 — Ensure compatibility with non-Apple devices
- MP3 to WAV — Prepare audio for editing software
FAQ
Which audio format has the best quality?
WAV and FLAC both offer perfect, lossless quality. FLAC is smaller than WAV because it uses lossless compression, but both preserve the original audio data exactly.
Is AAC better than MP3?
Yes. At the same bitrate, AAC produces better audio quality than MP3. A 128 kbps AAC file sounds roughly equivalent to a 160–192 kbps MP3. However, MP3 has wider compatibility.
Can I convert MP3 to FLAC to improve quality?
No. Converting from a lossy format (MP3) to a lossless format (FLAC) doesn't restore lost data. The FLAC file will be larger but won't sound any better than the original MP3. Only convert to FLAC from a lossless source (WAV, CD, studio master).
What format should I use for podcasts?
MP3 at 128 kbps mono is the standard for podcasts. Mono is sufficient because most podcasts are voice-only, and it halves the file size compared to stereo. Use our audio compressor to optimize your podcast files.