Convert AAC to Lossless FLAC Format
Slightly less universal than MP3 on very old hardware; some legacy car stereos and portable players lack AAC support. Converting to FLAC gives you a key advantage: lossless compression reduces file sizes by 40–60% while guaranteeing bit-perfect reconstruction of the original audio. FLAC is best for archiving music collections at cd quality with ~50% file size reduction and bit-perfect playback.
Why Convert AAC to FLAC?
Slightly less universal than MP3 on very old hardware; some legacy car stereos and portable players lack AAC support — converting to FLAC overcomes this by providing lossless compression reduces file sizes by 40–60% while guaranteeing bit-perfect reconstruction of the original audio
FLAC is the right choice when you need to: building audiophile music libraries with verifiable bit-perfect quality
Gain broader compatibility — FLAC works with Foobar2000, VLC, Spotify (internal), Tidal, Amazon Music HD, Android, macOS (since Ventura), most modern devices
Prevent further quality degradation — once converted to FLAC, no additional data is lost on re-saves
AAC vs FLAC — Format Comparison
Advanced Audio Coding (.aac)
Free Lossless Audio Codec (.flac)
How to Convert AAC to FLAC
Upload your AAC file
Drag your .aac file onto the upload area or click to browse. We accept AAC files up to 100 MB.
Choose FLAC as output format
Select .flac (Free Lossless Audio Codec) from the format list. FLAC uses lossless compression, so your output quality matches the source.
Convert and download
Click Convert and wait for processing. Your FLAC file will be ready to download in seconds. The result is optimized for archiving music collections at cd quality with ~50% file size reduction and bit-perfect playback.
Frequently Asked Questions
Will converting AAC to FLAC improve my file's quality?
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No — converting a lossy AAC to lossless FLAC preserves exactly what you have, but cannot restore data already discarded by AAC compression. The benefit is that no further quality is lost on subsequent edits and re-saves.
How large will my FLAC file be compared to the original AAC?
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AAC files are typically 2 MB – 10 MB per song, while FLAC files are typically 15 MB – 50 MB per song. The actual size depends on content complexity and any quality settings you choose.
What software can open the converted FLAC file?
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FLAC is compatible with: Foobar2000, VLC, Spotify (internal), Tidal, Amazon Music HD, Android, macOS (since Ventura), most modern devices.
What is the maximum file size I can convert?
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PureConverter accepts AAC files up to 100 MB. Your files are processed securely and deleted from our servers after conversion.
What's the difference between AAC and FLAC?
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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. FLAC (Free Lossless Audio Codec) is best for archiving music collections at cd quality with ~50% file size reduction and bit-perfect playback. Key tradeoff: AAC's advantage is measurably better audio quality than mp3 at every bitrate — 128 kbps aac matches roughly 192 kbps mp3 in listening tests, while FLAC's advantage is lossless compression reduces file sizes by 40–60% while guaranteeing bit-perfect reconstruction of the original audio.
Pro Tips for AAC to FLAC Conversion
FLAC preserves full quality, so your output file will be as good as the AAC source — no need to worry about compression artifacts
Keep a backup of your original AAC file — while our conversion is reliable, having the source is always recommended
FLAC works especially well for: distributing high-resolution studio masters through services like bandcamp and qobuz
Did you know? Every FLAC file contains an embedded MD5 checksum of the original audio — you can verify at any time that your file hasn't been corrupted and is truly lossless, something no other audio format offers natively.
Ready to Convert?
Upload your AAC file above and get your FLAC in seconds. Free, fast, and secure.