Convert AAC to FLAC
Convert your AAC audio files to FLAC directly in your browser.
How to convert audio in 3 steps
Choose a AAC audio file.
Click convert to FLAC.
Download your FLAC audio.
Format descriptions
AAC — AAC (Advanced Audio Coding) is a lossy audio codec that is more efficient than MP3 at the same bitrate. It is the standard for MP4 video and modern devices.
FLAC — FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives.
Technical comparison: AAC vs FLAC
Technical breakdown of the AAC and FLAC specifications: compression, colour, transparency and animation support.
| Property | AAC | FLAC |
|---|---|---|
| Specification | AAC (Advanced Audio Coding) | FLAC (Free Lossless Audio Codec) |
| Media type | Audio | Audio |
| Compression | Lossy · LC / HE-AAC | Lossless · FLAC |
| Color space / bit depth | 16-bit up to 48 kHz | 16/24-bit up to 192 kHz |
| Transparency | Not applicable | Not applicable |
| Animation | No (static) | No (static) |
| Best for | AAC (Advanced Audio Coding) is a lossy audio codec that is more efficient than MP3 at the same bitrate. It is the standard for MP4 video and modern devices. | FLAC is an open-source lossless audio format that compresses without losing quality, roughly halving file size. Ideal for audio archives. |
What happens when converting AAC to FLAC?
The AAC data is decoded inside your browser with WebAssembly and re-encoded to the FLAC specification, so no file is ever uploaded to a server. Both formats rely on comparable compression, so file size and perceived quality stay in the same range.
Frequently Asked Questions
What is audio conversion?
Audio conversion changes an audio file from one format to another, for example from AAC to FLAC, while keeping the audio content.
Are my audio files uploaded?
No. This tool processes audio files directly in your browser. Your audio files are never sent to a server.
Which audio formats are supported?
This tool converts AAC audio files to FLAC, all in your browser.
Is it really free and unlimited?
Yes, the tool is completely free and you can convert as many audio files as you want, with no limits.
Does it work on mobile too?
Yes, it works on any modern device, including smartphones, tablets and desktop computers.
Which format will the result be in?
The converted file will always be in FLAC format, ready to download and use.
About the audio converter
Convert AAC to FLAC audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
See also:
- Audio Converters
- Compress Audio OnlineCompress MP3, WAV, OGG, M4A, AAC, OGA, FLAC, ALAC, AIFF, OPUS, M4B and AC3 audio files online for free. Reduce the file size of your audio recordings while keeping good quality. Everything happens in your browser: audio files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert AAC to MP3Convert AAC to MP3 audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert AAC to WAVConvert AAC to WAV audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.
- Convert AAC to OGGConvert AAC to OGG audio online for free. Everything happens in your browser: your files are never uploaded to a server, and you need no downloads or sign-up to get started.