AAC → FLAC
Convert AAC to FLAC – locally in your browser
Why AAC → FLAC?
AAC is a lossy format – converting to FLAC won't make it better, but FLAC is open, royalty-free, and ideal for long-term archiving. All common music players support FLAC.
Frequently Asked Questions
What is a FLAC file?
FLAC (Free Lossless Audio Codec) is a lossless audio format. It compresses audio without quality loss and is ideal for archiving.
Are my files safe?
Yes, 100%. The conversion happens completely locally in your browser – your files are never uploaded to a server.
Can I convert multiple files at once?
Yes, you can upload and convert as many AAC files as you want at the same time.
Is the conversion free?
Yes, wandlio.de is completely free. No registration, no limits, no ads.
About FLAC
FLAC (Free Lossless Audio Codec) was developed by Josh Coalson in 2001 and is the most widely used format for lossless audio compression. FLAC files are about 50 to 60 percent smaller than uncompressed WAV files while preserving the original quality bit-for-bit. The format is patent-free, maintained by the Xiph.Org Foundation, and was published as RFC 7900 in 2014. FLAC supports sample rates up to 655 kHz, bit depths up to 32 bits, and up to 8 channels, embedded cuesheets for continuous album playback, ReplayGain volume adjustment, and Vorbis comments for metadata. The codec is supported by virtually all modern playback devices and software players, including Spotify, Apple Music, Tidal, and Amazon Music, which all offer FLAC for HiFi streaming. FLAC is the standard among audiophiles and music archives where no quality loss is acceptable. For everyday mobile use, converting to AAC or Opus is recommended since FLAC files at typical album sizes consume considerable storage.
About AAC
AAC (Advanced Audio Coding) was developed in 1997 as part of the MPEG-2 standard (ISO 13818-7) and updated in the MPEG-4 standard in 1999. AAC is the direct successor to MP3 and achieves significantly better audio quality at the same bitrate, using finer psychoacoustic models and MDCT windows with adaptive length. AAC supports sample rates up to 96 kHz, up to 48 channels, and HE-AAC (High Efficiency) for bitrates starting at 24 kbps, making it the standard for streaming services like YouTube, Netflix, and Apple Music. Apple introduced AAC as the standard format in the iTunes Store in 2003, establishing it in the mass market. The format is part of MP4 containers and is supported by virtually all modern playback devices and browsers. AAC is the better choice over MP3 at equivalent bitrates and should be preferred for new audio projects.
Why convert AAC → FLAC?
AAC (Advanced Audio Coding) is the official successor to MP3 with approximately 25% better compression at equivalent quality. It's widely used in M4A containers and MP4 videos but isn't supported by all players as a standalone AAC file. Converting to FLAC creates a lossless archive version (FLAC), a universally compatible format (MP3), or an open format (OGG) for exchange. FLAC makes AAC files usable across all platforms and applications. FLAC offers lossless compression at half the WAV size — ideal for quality archiving and HiFi playback.