Convert AAC to FLAC
Convert AAC files to FLAC locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert AAC to FLAC
- Drop your .aac files above, or click Upload Files. You can add many files at once.
- FLAC is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .flac files as soon as each one finishes.
What to know about AAC to FLAC conversion
- Converting a lossy AAC to FLAC cannot restore detail that was already discarded, but it avoids any further loss in later edits.
- You can choose the bitrate, sample rate and channels (mono, stereo or a 3D spatial effect).
AAC vs FLAC
| Feature | AAC (Advanced Audio Coding) | FLAC (Free Lossless Audio Codec) |
|---|---|---|
| Compression | lossy | lossless |
| Best for | good quality at low bitrates for streaming | archiving music without any quality loss |
| Opens in | Apple devices, browsers and most media players | VLC, foobar2000, Android and most hi-fi players |
AAC (Advanced Audio Coding): A lossy digital audio compression format designed as the successor to MP3, offering higher sound quality at similar bitrates.
FLAC (Free Lossless Audio Codec): An open-source lossless audio compression format, preserving perfect audio quality at reduced file sizes.
Conversion options
- Sample rate: 22.05, 44.1 or 48 kHz
- Mono, stereo or 3D spatial audio
- Playback speed (0.5× to 2×)
Frequently asked questions
Is it safe to convert AAC to FLAC here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several AAC files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert FLAC to AAC.
Convert AAC to other formats
Convert other formats to FLAC
- MP4 to FLAC
- MP3 to FLAC
- WAV to FLAC
- MOV to FLAC
- M4A to FLAC
- WEBM to FLAC
- MKV to FLAC
- OGG to FLAC
- OPUS to FLAC
- AVI to FLAC
- WMA to FLAC
- AIFF to FLAC
See every AAC converter and FLAC converter, or browse the full converter directory.