Audio converter · runs 100% in your browser
FLAC to AAC Converter
Convert FLAC audio to AAC in your browser. FLAC is lossless compression, audiophile quality, files smaller than WAV; AAC is lossy, slightly better than MP3 at the same bitrate, used by iTunes/YouTube. A WebAssembly build of FFmpeg handles the re-encoding right in your tab — your file stays on your device throughout.
How to use
- Drop your FLAC file (or click to pick one).
- The first audio conversion of the session loads FFmpeg.wasm — about 25 MB, cached afterwards.
- Conversion to AAC runs locally; nothing uploads to a server.
- Download the AAC result when the progress bar completes.
FAQ
Will FLAC to AAC change the audio quality?
FLAC is lossless. AAC is lossy, so the converter re-encodes at a sensible default bitrate (190–256 kbps depending on codec).
Why use a browser-based audio converter?
Because your audio never leaves your device. Most online audio converters upload your file to a server. This one runs FFmpeg as WebAssembly inside your browser, so the file stays local.
How long does conversion take?
For typical 3-minute songs, a few seconds on desktop, longer on mobile. The first conversion of the session also downloads FFmpeg.wasm (~25 MB), then caches it for the rest of the session.
Is there a length limit?
No length cap. Practical limits come from your device's memory — long uncompressed WAV files or full-length FLACs will use more RAM than short MP3s.