Compare Advanced Audio Coding and Free Lossless Audio Codec formats — understand the key differences and when to use each
Advanced Audio Coding
AAC (Advanced Audio Coding) is a lossy audio codec standardized as ISO/IEC 13818-7, designed as the successor to MP3. AAC delivers noticeably better sound quality than MP3 at the same bitrate, particularly at lower bitrates (96-128 kbps) where the difference is most audible. AAC is the default audio format for Apple devices (iTunes, Apple Music, iPhone), YouTube, and many streaming services. It supports up to 48 channels, sample rates up to 96 kHz, and various profiles including LC (Low Complexity), HE-AAC (High Efficiency), and HE-AAC v2. AAC files typically use the .m4a container (MPEG-4 Audio) or .aac extension. The codec is more efficient than MP3 due to improved spectral processing and entropy coding. AAC is also the standard audio codec in MP4 video files.
Free Lossless Audio Codec
FLAC (Free Lossless Audio Codec) is an open-source audio format that provides lossless compression — reducing file sizes by 50-70% compared to WAV while preserving 100% of the original audio data. FLAC was created by Josh Coalson in 2001 and has become the gold standard for lossless music archiving. It supports sample rates up to 655,350 Hz, bit depths up to 32-bit, and up to 8 channels. FLAC includes extensive metadata support (Vorbis comments), embedded album art, and CUE sheet integration. The format is supported by most music players, streaming services (Tidal, Qobuz, Amazon Music HD), and audiophile hardware. FLAC decoding is computationally lightweight, making it suitable for portable devices. For audiophiles, FLAC represents the optimal balance between file size and perfect audio quality — significantly smaller than WAV but with zero compromise in sound reproduction.
| Feature | AAC | FLAC |
|---|---|---|
| Full Name | Advanced Audio Coding | Free Lossless Audio Codec |
| File Extension | .aac | .flac |
| Category | audio | audio |
| Free to Convert | ✓ Yes | ✓ Yes |
| Browser Support | ✓ All Browsers | ✓ All Browsers |
| Convert to Each Other | ✓ Yes | ✓ Yes |
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