How to Convert AAC to FLAC
- Click the drop zone above or drag and drop your AAC file(s) into it.
- Make sure FLAC is selected as the output format.
- Choose your preferred sample rate (44.1 kHz recommended for most uses).
- Click "Convert All" and wait for the conversion to complete.
- Download your converted FLAC file(s) individually.
What is AAC?
Advanced Audio Coding (AAC) — A lossy audio format that delivers better sound quality than MP3 at the same bitrate. The default format for Apple devices and YouTube.
- Format type: Lossy
- File extension: .aac
What is FLAC?
Free Lossless Audio Codec (FLAC) — A lossless compression format that reduces file size without any quality loss. Perfect for archiving music and high-fidelity audio playback.
- Format type: Lossless (compressed)
- File extension: .flac
Why Convert AAC to FLAC?
While converting from a lossy format (AAC) to a lossless format (FLAC) won't recover lost audio data, it provides a widely-compatible container for further editing or archiving. The FLAC file will preserve the audio exactly as decoded from your AAC source.
AAC vs FLAC — Key Differences
| Feature | AAC | FLAC |
|---|---|---|
| Full name | Advanced Audio Coding | Free Lossless Audio Codec |
| Compression | Lossy | Lossless (compressed) |
| File extension | .aac | .flac |
Frequently Asked Questions
Is this converter free?
Yes, completely free. There are no limits on the number of conversions, no file size restrictions, and no account required.
Is my audio data safe?
Absolutely. Your files never leave your device. All conversion happens locally in your browser using the Web Audio API — no data is uploaded to any server.
What browsers are supported?
This converter works in all modern browsers including Chrome, Firefox, Safari, and Edge. Some output formats (OGG, WebM, AAC) depend on your browser's MediaRecorder support.
Can I convert multiple files at once?
Yes. You can drop or select multiple AAC files and they will all be converted to FLAC in sequence.