Extract FLAC Audio from MP4
Free online audio converter. Pull the audio out of MP4 video as FLAC right in the browser. Files are never uploaded anywhere.
About MP4 and FLAC
MP4 is the standard video container on the web. Extracting its audio track is a quick way to turn a music video, lecture or recording into a listenable file.
FLAC is lossless compression for audio — bit-identical to the source at roughly half the size of WAV. It is the archival format of choice for music collections and masters.
Extracting audio from MP4 re-encodes only the audio track — the video is discarded, so even long files finish quickly.
How the conversion works
This tool runs FFmpeg — the same engine behind most media software — compiled to WebAssembly, entirely in the browser. The file is read locally, converted locally and saved straight from memory; nothing is ever uploaded, which also means no queues and no server-side file size limits.
The converter itself is a one-time ~31 MB download on the first conversion, cached by the browser afterwards. Once it is loaded, everything works offline.
More audio converter pages
Free and open source from Earthling Digital, an independent creative agency. Built with Earthling UI.