Convert AAC to FLAC - Audio Converter
Free online tool to convert AAC to FLAC audio format. Fast, private, browser-based conversion.
Lossless format - bitrate setting not applicable
Drop audio files here or click to browse
Supports MP3, WAV, FLAC, AAC, OGG, M4A, WEBM, WMA
Supported Formats
Most popular lossy format
Uncompressed lossless audio
Compressed lossless audio
Advanced lossy codec
Open-source lossy format
Apple's audio container
Web-optimized format
Windows Media Audio
Features
Privacy First
All audio processing happens directly in your browser. Your files never leave your device.
Batch Processing
Convert multiple files simultaneously. Download all results at once.
Fast Conversion
Powered by WebAssembly for near-native performance in your browser.
Quality Control
Adjust bitrate and quality settings for customized output.
Why Convert AAC to FLAC?
Converting AAC to FLAC can be useful when you need your audio in FLAC format for compatibility with specific software or workflows. However, note that converting from a lossy format (AAC) to a lossless format (FLAC) will not recover audio data lost during the original compression. The resulting file will be lossless but will contain only the audio quality present in the AAC source.
Advanced Audio Coding (AAC)
Lossy
AAC is a lossy audio codec designed as the successor to MP3. It achieves better sound quality than MP3 at similar bitrates, making it more efficient for storage and streaming. AAC is the default audio format for Apple devices, YouTube, and many streaming services.
Free Lossless Audio Codec (FLAC)
Lossless (Compressed)
FLAC is an open-source lossless audio codec that compresses audio without any quality loss. It typically reduces file sizes by 50-70% compared to WAV while preserving bit-perfect audio quality. FLAC is the preferred format for audiophiles and music archival.
How to Convert AAC to FLAC
- Click the upload area above or drag and drop your AAC files into the converter
- The output format is automatically set to FLAC for this page, or you can change it using the format selector
- Adjust the bitrate setting if needed (higher bitrate = better quality, larger file size)
- Click "Convert All" to start the conversion process
- Download your converted FLAC files individually or all at once
AAC vs FLAC — Format Comparison
| Format | Compression Type | Audio Quality | File Size | Compatibility | Best For |
|---|---|---|---|---|---|
| AAC | Lossy | Good (bitrate-dependent) | Small | High (Apple/streaming) | Streaming, Apple devices |
| FLAC | Lossless (Compressed) | Perfect (bit-for-bit) | Medium | High (growing) | Audiophile collections, archival |
Frequently Asked Questions
Is converting AAC to FLAC free?
Yes, our AAC to FLAC converter is completely free with no limits on file size or number of conversions. All processing happens in your browser, so there are no server costs or restrictions.
Will I lose audio quality converting AAC to FLAC?
The conversion itself will not cause any additional quality loss, but converting AAC (a lossy format) to FLAC (a lossless format) cannot restore audio quality that was already lost during the original AAC encoding.
How long does AAC to FLAC conversion take?
Conversion speed depends on the file size and your device's processing power. Since our converter runs entirely in your browser using WebAssembly, typical audio files convert in just a few seconds. Larger files or older devices may take slightly longer.
Is my audio file safe when converting AAC to FLAC?
Absolutely. Your audio files never leave your device. All AAC to FLAC conversion processing happens locally in your browser using WebAssembly technology. We don't upload, store, or have access to any of your files.
Can I batch convert multiple AAC files to FLAC?
Yes, you can upload and convert multiple AAC files to FLAC format simultaneously. Simply drag and drop all your files at once, and click "Convert All" to process them all. You can then download each file individually or use the "Download All" button.