Compress FLAC to AAC for Smaller File Sizes

Yes — AAC uses lossy compression, which discards some data to achieve smaller files. Slightly less universal than MP3 on very old hardware; some legacy car stereos and portable players lack AAC support. For most practical purposes at high quality settings, the difference is imperceptible.

FLAC files are typically 15 MB – 50 MB per song, while AAC files are typically 2 MB – 10 MB per song. The actual size depends on content complexity and any quality settings you choose.

AAC is compatible with: iOS/macOS (native), iTunes, Apple Music, YouTube, Spotify, all modern browsers, Android.

PureConverter accepts FLAC files up to 500 MB. Your files are processed securely and deleted from our servers after conversion.

FLAC (Free Lossless Audio Codec) is best for archiving music collections at cd quality with ~50% file size reduction and bit-perfect playback. AAC (Advanced Audio Coding) is best for streaming music and audio at high quality with lower bitrates than mp3 — the default codec for apple music and youtube. Key tradeoff: FLAC's advantage is lossless compression reduces file sizes by 40–60% while guaranteeing bit-perfect reconstruction of the original audio, while AAC's advantage is measurably better audio quality than mp3 at every bitrate — 128 kbps aac matches roughly 192 kbps mp3 in listening tests.