Convert AAC to FLAC
Convert any audio file to FLAC format online for free. Fast, secure, and easy-to-use audio to FLAC converter with no software installation required.
Drag & Drop Audio File
or click below to browse
Supported formats (Max 50MB, 30 min • Sign in for 200MB, 1 hr)
Why Choose Scriptivox AAC to FLAC Converter?
Fast Conversion
Our powerful servers process your files quickly, delivering converted files in seconds.
100% Free
Convert your files completely free with no hidden costs or subscription fees.
Secure & Private
Your files are encrypted and automatically deleted after conversion. We never store or share your data.
No Installation
Works directly in your web browser. No software download or installation required.
How to Use AAC → FLAC
Upload File
Drag and drop your AAC file or click to browse. Supports files up to 1GB.
Convert
Select FLAC as your output format and click convert. Our servers will process your file instantly.
Download
Download your converted file instantly. The download link expires in 1 hour for security.
AAC vs FLAC: format comparison
How the two formats differ on the things that change your result.
| Specification | AAC (source) | FLAC (result) |
|---|---|---|
| Container | ADTS / raw AAC | FLAC |
| Developed by | MPEG / Fraunhofer IIS | Xiph.Org Foundation |
| Introduced | 1997 | 2001 |
| Audio codecs | AAC-LC, HE-AAC | FLAC |
| Compression | Lossy | Lossless (compressed) |
| Max sample rate | 96 kHz | 192 kHz |
| Max channels | 8 | 8 |
| Gapless playback | Partial | Yes |
| Metadata / tags | ID3v2 (limited in ADTS) | Vorbis comments |
| Approx. file size | 0.72–1.92 MB per minute | 5–7 MB per minute |
| Licensing | Patent-licensed | Royalty-free |
| Plays natively on | Native: Web browsers, Windows, macOS, iOS, Android, Smart TVs | Native: Web browsers, Windows, macOS, iOS, Android · Needs a player: Smart TVs |
| Best for | streaming services, mobile playback, broadcast | long-term archiving, audiophile listening, CD ripping |
What changes when you convert AAC to FLAC
Going from AAC to FLAC locks in the quality you have now, it does not recover what was lost when the file was first encoded. That is still the right move before editing, because FLAC will not add a second round of compression damage. Budget for the size jump: about 1.3 MB per minute becomes roughly 6 MB per minute.
This conversion moves the file toward a different purpose: AAC suits streaming services, mobile playback, broadcast, whereas FLAC is chosen for long-term archiving, audiophile listening, CD ripping.
Tags do not transfer verbatim. AAC stores them as ID3v2 (limited in ADTS) while FLAC uses Vorbis comments, so titles and artwork are remapped and unusual custom fields may not survive.
About AAC to FLAC Conversion
Converting AAC to FLAC means moving audio out of the ADTS / raw AAC container, introduced in 1997, and into FLAC, which arrived in 2001. The two were designed with different priorities, and that is what determines whether this conversion costs you quality, storage, or compatibility.
Developed by MPEG / Fraunhofer IIS in 1997, AAC stores audio using AAC-LC, HE-AAC. That codec choice sets the upper bound on what any conversion can preserve.
FLAC, from Xiph.Org Foundation and dating to 2001, uses FLAC and plays natively on 5 of the six platform categories we track. That combination is usually why people convert into it.
After converting your file, you can use Scriptivox transcription services to convert your audio to text. Perfect for meetings, interviews, podcasts, and more.
AAC to FLAC: common questions
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