AAC 转 FLAC - 在线免费转换
在浏览器里直接把 .aac 转成 .flac。文件不上传，免登录，转完即下载。
What is AAC?
Advanced Audio Coding (.aac) — AAC is the successor to MP3, offering better sound quality at similar bitrates. It is the default audio format for Apple devices, YouTube, and many streaming services.
What is FLAC?
Free Lossless Audio Codec (.flac) — FLAC is an open-source lossless audio codec. It compresses audio without losing any quality, resulting in files about 50-60% the size of WAV while preserving every detail.
AAC vs FLAC
| Feature | AAC | FLAC |
|---|---|---|
| Full Name | Advanced Audio Coding | Free Lossless Audio Codec |
| Compression | Lossy | Lossless |
| Typical Bitrate | 128-256 kbps | 600-1,000 kbps |
| Best For | Apple devices, streaming services, mobile audio | Audiophile music collections, archiving, high-fidelity playback |
| File Extension | .aac | .flac |
Frequently Asked Questions
Is converting AAC to FLAC free?
Yes, completely free. The conversion runs entirely in your browser using WebAssembly — your files never leave your device and no sign-up is required.
Will I lose audio quality converting AAC to FLAC?
Converting from lossy AAC to lossless FLAC will not restore lost audio data, but it will preserve the existing quality without further degradation.
What is the maximum file size?
You can convert audio files up to 100MB. Since the conversion happens in your browser, processing speed depends on your device's performance.
Is my audio file uploaded to a server?
No. All format conversion is processed locally in your browser using FFmpeg WebAssembly. Your files never leave your device, ensuring complete privacy.