Guide · 8 min read · Updated 19 Oct 2026
Audio Formats Explained: MP3, M4A, AAC, WAV, FLAC, OGG & OPUS
Plain-English comparison of every common audio format: quality, file size, device support and the best choice for music, ringtones, podcasts, voice notes and editing.
Tools used in this guide
All audio formats store the same thing, sound, but they make different trade-offs between quality, file size and compatibility. Here's what matters.
Lossy vs lossless in one paragraph
Lossy formats (MP3, AAC/M4A, OGG, OPUS, WMA) remove sounds people barely hear, which makes files 5–10× smaller. Lossless formats (WAV, AIFF, FLAC, ALAC) keep every bit. FLAC and ALAC compress losslessly, like a ZIP file. Converting lossy → lossless never restores lost detail.
Comparison
| Format | Type | Size (3-min song) | Best for |
|---|---|---|---|
| MP3 | Lossy | ~4–7 MB | Sharing, car stereos, anything old |
| M4A / AAC | Lossy | ~3–6 MB | iPhone, Android, better quality than MP3 |
| OPUS | Lossy | ~1–3 MB | Voice notes, calls, low bandwidth |
| OGG | Lossy | ~3–5 MB | Android notification sounds, games |
| FLAC | Lossless | ~18–25 MB | Archiving CDs, hi-res music |
| ALAC | Lossless | ~18–25 MB | Lossless on iPhone and Apple Music |
| WAV | Uncompressed | ~30 MB | Editing, studios, phone systems |
Which should I choose?
- Just want it to play anywhere: MP3 at 192 kbps.
- iPhone music library: M4A (AAC 256 kbps) or ALAC for lossless.
- iPhone ringtone: M4R, using the ringtone maker.
- Podcast or speech: MP3 mono 96–128 kbps (use Stereo to Mono).
- Editing in Audacity, GarageBand or a DAW: WAV 48 kHz.
- Archive: FLAC.
- Old call recordings (.amr): convert to MP3 to play them on a computer. See how to open AMR files.
Bitrate cheat sheet
For MP3: 128 kbps = fine for speech, 192 kbps = transparent for most listeners, 320 kbps = maximum. AAC at 160 kbps ≈ MP3 at 192 kbps. Opus at 64 kbps sounds better than MP3 at 128 kbps.
Frequently asked questions
Is 320 kbps MP3 the same as CD quality?
Can I convert FLAC to MP3 without losing quality?
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