Convert FLAC to iPhone Audio — Free Online Converter

iPhone Audio conversion targets AAC or ALAC optimized for Apple's smartphone. Like iPad, iPhones cannot play FLAC natively through the Music app or Files app. The iPhone's entire audio pipeline — from the Music app to Siri requests to CarPlay — is built around AAC, ALAC, and MP3. Converting FLAC to iPhone-compatible audio ensures that your lossless music works with every feature of iOS, including lock screen controls, Focus modes, Spatial Audio, and lossless streaming via Apple Music.

iPhone users who purchase FLAC albums from stores like Bandcamp, HDtracks, or Qobuz cannot play them in the Music app. iOS does not register FLAC as a playable format, so even AirDrop or Files-imported FLAC files are treated as generic documents. Converting to ALAC preserves every detail of the original recording in a format that integrates with iOS's Now Playing, AirPlay, CarPlay, SharePlay, and Apple Watch syncing.

The conversion uses FFmpeg to decode FLAC and encode to ALAC (lossless, ~50-60% of WAV size) or AAC-LC (lossy, ~75% smaller than FLAC) in an M4A container. iPhone DAC output is limited to 24-bit/48 kHz over the Lightning/USB-C port; higher sample rates are downsampled by CoreAudio. For Bluetooth output via AirPods, the codec negotiation selects AAC at 256 kbps regardless of the source format — so FLAC over AirPods provides no quality advantage over 256 kbps AAC source files.