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AAC to FLAC - Online Audio Converter
Convert AAC to FLAC online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AAC to FLAC
Drop AAC audio here or click to select
AAC
FLAC (FLAC)
About AAC to FLAC
Convert AAC to FLAC. AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. FLAC halves WAV sizes bit-for-bit with open hardware support. Apple players prefer ALAC; convert for iPhone libraries..
Why convert AAC to FLAC?
- Larger files than lossy shares with FLAC lossless quality.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AAC vs FLAC
| Codec | AAC | FLAC |
|---|---|---|
| Compression | lossy | lossless |
| Sample behavior | Quality set by bitrate | Full quality kept |
| Typical use | AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. | FLAC halves WAV sizes bit-for-bit with open hardware support. |
When not to convert AAC to FLAC
- Skip FLAC for the smallest share: lossless output stays large, so prefer a lossy target when sending AAC files.
- Keep a master copy: repeated exports stack small losses, so archive AAC before batch FLAC shares.
Limits
Starting point: AAC - Efficient lossy audio for streaming services. Container variants (ADTS, MP4) need matching extensions on export. Apple players prefer ALAC; convert for iPhone libraries. Encode FLAC (FLAC) from AAC at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert AAC to FLAC?
Drop your AAC file onto this page, choose quality and codec settings, then click Convert. The result downloads as FLAC instantly. All processing runs in your browser.
What codec is used for FLAC?
The default codec for FLAC is FLAC. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.