AAC → FLAC
Convert AAC to FLAC
Free, instant and 100% private. Your AAC file is converted on your own device and never uploaded anywhere.
Drop your AAC file here
or click to choose — converted to FLAC instantly, on your device
Nothing is uploaded. Your files never leave this browser.
Converting AAC to FLAC is a common task when you need lossless quality. AAC (Advanced Audio Coding) is the successor to MP3, delivering better sound at the same bitrate. It powers YouTube, Apple Music and most streaming, and is widely (though not universally) supported. FLAC, on the other hand, gives you lossless quality and smaller than wav. ZeroUpload performs this conversion entirely inside your browser, so your AAC file is never uploaded to a server.
How to convert AAC to FLAC
- 1
Drop your AAC file into the box (or click to select it).
- 2
ZeroUpload converts it to FLAC instantly, right inside your browser.
- 3
Download your new FLAC file. Nothing was ever uploaded.
When should you convert AAC to FLAC?
You should convert AAC to FLAC when you want lossless music archiving but your source is AAC. Typical situations include streaming and downloads, higher quality than MP3 at the same size, where the destination expects FLAC instead.
AAC vs FLAC
Advanced Audio Coding (AAC)
AAC (Advanced Audio Coding) is the successor to MP3, delivering better sound at the same bitrate. It powers YouTube, Apple Music and most streaming, and is widely (though not universally) supported.
Strengths
- + Better quality than MP3 per byte
- + Widely supported
- + Streaming standard
Trade-offs
- – Lossy
- – Slightly less universal than MP3
Free Lossless Audio Codec (FLAC)
FLAC (Free Lossless Audio Codec) compresses audio with zero quality loss — typically to about half the size of WAV. It is the audiophile favourite for archiving and high-fidelity listening, at the cost of larger files than lossy formats.
Strengths
- + Lossless quality
- + Smaller than WAV
- + Free and open
Trade-offs
- – Larger than MP3/AAC
- – Not supported by every device
Frequently asked questions
How do I convert AAC to FLAC? +
Drop your AAC file into the box above (or click to choose it), and ZeroUpload converts it to FLAC right inside your browser. Then download the result. No account, no waiting.
Is it safe to convert AAC files here? +
Completely. ZeroUpload does the entire conversion on your own device. Your AAC file is never uploaded to any server, so your data stays 100% private.
Does converting AAC to FLAC cost anything? +
No. It is free with no limits and no signup. Because the conversion runs on your device, there are no server costs and therefore no paywalls.
What is the difference between AAC and FLAC? +
AAC is a modern lossy codec offering better quality than MP3 at the same bitrate. FLAC is a lossless compressed format beloved by audiophiles. Converting from AAC to FLAC trades better quality than mp3 per byte for lossless quality.
Will it work offline? +
Yes. Once the page (and engine) has loaded, the AAC to FLAC conversion works even with your internet disconnected, because everything happens locally.