Convert FLAC to AAC online

Your FLAC file is converted to AAC right here in your browser, using FFmpeg compiled to WebAssembly. Nothing is uploaded to us, the audio never leaves your device. Quality is preserved and the download is ready in seconds.

What is a FLAC file?

FLAC (Free Lossless Audio Codec) compresses audio the way ZIP compresses files: the data gets smaller (typically 50 to 60% of WAV size) but decodes back to exactly the original samples. Nothing is lost, ever.

FLAC is the archiving and audiophile standard: music collections, radio archives and oral-history projects use it to keep perfect masters at half the storage cost of WAV.

Why AAC?

AAC (Advanced Audio Coding) is MP3's designed successor: at the same bitrate it preserves noticeably more detail, especially at the low bitrates where MP3 falls apart. It is the audio inside YouTube videos, M4A files and most streaming services.

Convert to AAC when you want the best lossy quality-per-megabyte with near-universal modern support. It beats MP3 at every bitrate and every current device plays it. FLAC playback support is broad but not total, iPhones handle it awkwardly, and some editors still prefer WAV, and the files remain far larger than any lossy format.

Frequently asked questions

Will converting FLAC to AAC lose quality?

You trade a little fidelity for a much smaller file. AAC is a lossy format, so detail the ear is least likely to miss is discarded during encoding, for speech and most listening the difference is inaudible at the high-quality settings this converter uses. Keep your original FLAC as the master and treat the AAC as the sharing copy.

Is it free?

Yes, completely, with no account and no watermark. The conversion runs on your own device, so it costs us nothing to let you use it. The only limit is file size: up to 50 MB, which is what a browser can hold in memory comfortably.

Do I need to install anything, or upload my file?

Neither. It runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio is never sent to us, which is also why it works on a slow connection, only the page downloads, not your file.

Need a transcript of the audio?

Autrans also transcribes audio in Nigerian English, Pidgin, Yoruba, Hausa, Igbo, French, and Spanish.