Convert your AAC audio files to FLAC format using our free online tool. While AAC offers good quality with small file sizes, FLAC provides lossless audio quality, making it perfect for archiving, professional work, and audiophile listening. No Signup Required.
AAC (Advanced Audio Coding) was designed as the successor to MP3 and generally achieves better sound quality at similar bit rates. It was developed by a group including Fraunhofer, Nokia, and Dolby.
FLAC (Free Lossless Audio Codec) is an open-source audio format that provides bit-perfect copies of audio while typically reducing file size by 40-50% compared to uncompressed audio.
While AAC uses "perceptual coding" to remove sound elements the human ear typically can't perceive, FLAC preserves all audio data and only compresses it without discarding any information.
Converting from AAC to FLAC won't recover data already lost in the AAC compression process, but it prevents any further quality loss when editing or converting to other formats later.
Converting AAC to FLAC involves a process called "transcoding" - where one format is decoded and then re-encoded to another format.
During this process, the AAC file is first decoded to PCM (uncompressed audio), then the FLAC encoder compresses this data without any quality loss.
FLAC files are typically larger than AAC files because they preserve all audio data. The typical compression ratio for FLAC is about 50-60% of the original uncompressed size.
Audiophiles prefer FLAC because it preserves every bit of audio data while still offering reasonable file sizes compared to uncompressed formats like WAV.
FLAC supports bit depths up to 32-bit and sample rates up to 655,350 Hz, making it future-proof for even the highest quality audio recordings.
Pro Tip: Converting from AAC to FLAC is ideal for preserving your audio quality for archiving or future editing. While FLAC files are larger than AAC, they offer perfect audio fidelity and can be converted to any other format without additional quality loss.
FLAC is a lossless audio format that preserves the full quality of your audio. Unlike lossy formats like AAC, FLAC maintains all audio data, making it ideal for archiving, professional audio work, and audiophiles who want the highest quality sound possible.
While converting from AAC to FLAC won't recover any quality already lost in the AAC compression, it will prevent any further quality loss. FLAC is lossless, meaning once your audio is in FLAC format, it can be converted to other formats without additional quality degradation.
Conversion time depends on the original file size. Most conversions complete within a few minutes or less.
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Your audio data is temporarily stored on our secure servers and automatically deleted after 24 hours for your convenience and privacy.
The maximum audio file size limit for conversion is 10MB.