AAC vs FLAC
Which audio format should you choose?
AAC wins on better quality than mp3 at the same bitrate. FLAC wins on truly lossless compression. For most general use, pick whichever is more compatible with your existing tools — file size and quality differences are usually small at the same encoding settings.
When to use AAC
Choose AAC when you need apple music and itunes libraries or youtube and streaming services. Its strengths: better quality than mp3 at the same bitrate, and wide modern device support.
Pros
- + Better quality than MP3 at the same bitrate
- + Wide modern device support
- + Efficient for streaming
Cons
- − Still lossy compression
- − Slightly less universal than MP3
- − Some licensing restrictions
When to use FLAC
Choose FLAC when you need high-resolution music libraries or cd ripping and audio archiving. Its strengths: truly lossless compression, and smaller than wav by roughly half.
Pros
- + Truly lossless compression
- + Smaller than WAV by roughly half
- + Open-source and royalty-free
- + Supports rich metadata and album art
Cons
- − Larger files than lossy formats like MP3 or AAC
- − Not supported natively in older devices
- − Limited iOS support before recent versions
Side-by-side
| Aspect | AAC | FLAC |
|---|---|---|
| Full name | Advanced Audio Coding | Free Lossless Audio Codec |
| Extension | .aac | .flac |
| MIME type | audio/aac | audio/flac |
| Compression | Lossy | Lossless |
| File size | Medium▲ | Large |
| Compatibility | Wide▲ | Modern only |
| Open source | No / partial | Yes |
| Best for | Apple Music and iTunes libraries | High-resolution music libraries |
▲ = generally favored on that aspect. Real-world results depend on encoder settings.
Convert between AAC and FLAC
AAC vs FLAC — Frequently Asked Questions
Is AAC better than FLAC?
Is AAC better than FLAC?
Neither is universally better — they serve different needs. AAC is stronger for apple music and itunes libraries, while FLAC is stronger for high-resolution music libraries. Pick based on what you're trying to do.
Can I convert AAC to FLAC?
Can I convert AAC to FLAC?
Yes — Zen Convert handles AAC to FLAC conversion for free, directly in your browser. It also handles the reverse (FLAC to AAC). No signup, no watermark.
Will I lose quality converting between AAC and FLAC?
Will I lose quality converting between AAC and FLAC?
AAC is lossy, so converting from the lossless format FLAC to AAC will lose some quality. Going the other direction (AAC → lossless) doesn't restore lost data — the lossless container just stores what's already there.
Which file is bigger : AAC or FLAC?
Which file is bigger : AAC or FLAC?
AAC files are usually smaller than FLAC files at the same quality. The difference depends on encoder settings, but the trend is consistent across most content.
Which one is better supported on phones?
Which one is better supported on phones?
AAC has broader mobile support. Most phones (iPhone and Android) play it natively without extra apps.