FLAC to AAC Converter

Convert FLAC to AAC Online

FLAC keeps every bit of the original master, which is exactly why a single album can run hundreds of megabytes. Converting to AAC trades that archival fidelity for files roughly three to five times smaller that play natively on iPhone, iPad, Apple Music, CarPlay, and every modern browser. The catch worth stating plainly: this is a one-time lossy step — at 256 kbps AAC is near-transparent for most listeners, but the data AAC discards is gone for good, so keep your FLAC originals.

How to Convert FLAC to AAC

1. Upload Your FLAC File: Drag and drop your .flac files onto the page, or click "Add Files" to browse. Multiple tracks queue together and convert with the same settings.
2. Set the Quality Preset: Open Advanced Options and choose a Preset — "Very High (Recommended)" maps to a ~256 kbps target that stays near-transparent for music. Drop to High or Medium when small size matters more than fidelity.
3. Pick a Bitrate Mode (Optional): Switch from Quality Preset to Constant Bitrate (e.g. 256 kbps), Variable Bitrate, or a Specific file size if you need to hit an exact target. You can also set Audio Sample Rate and Audio Channel here.
4. Convert and Download: Click "Convert" and download your .aac file. No sign-up, no watermark.

FLAC vs AAC at a Glance

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — never shared or made public.

Frequently Asked Questions

Will I lose audio quality converting FLAC to AAC?

Yes, but how much depends on the bitrate. FLAC is lossless, so it holds the exact original waveform; AAC is a perceptual codec that removes detail it judges inaudible. At 256 kbps most listeners cannot reliably tell well-encoded AAC from the FLAC source in a blind test. The loss is permanent, so always keep your FLAC originals as the master copy.

What bitrate should I pick for FLAC to AAC?

For music, 256 kbps (the "Very High" preset, the same rate Apple Music streams at) is the sweet spot — near-transparent without bloating the file. Use 320 kbps if you want maximum headroom, 128–192 kbps for spoken-word or podcasts where size matters, and Variable Bitrate if you'd rather let the encoder allocate bits by passage complexity.

Should the output be .aac or .m4a?

This page produces a raw .aac stream (ADTS), which is fine for many players. If you want the AAC audio wrapped in an MP4 container with chapter and tag support — the format Apple devices prefer — use our FLAC to M4A converter instead. The codec is the same AAC; only the container differs.

How small will my files get?

AAC files are typically three to five times smaller than the FLAC originals. In our testing, a full-length FLAC album in the few-hundred-megabyte range drops to tens of megabytes at 256 kbps AAC — enough to fit a large library on a phone. Exact size scales with the bitrate you choose and the track length.

Why convert to AAC instead of MP3?

AAC is more efficient at the same bitrate — a 256 kbps AAC file generally sounds cleaner than a 256 kbps MP3, and it is the native format for Apple Music, iTunes, and modern Apple hardware. If you specifically need MP3 for older players or car stereos, use our FLAC to MP3 converter; for batch shrinking existing audio, the Audio Compressor lets you keep the source format.