FizzyTools MP4 to MP3 uses these open-source components. Thank you to their authors. - Svelte (MIT) https://github.com/sveltejs/svelte - Mediabunny 1.61.3 (MPL-2.0) https://github.com/Vanilagy/mediabunny Reads and converts video and sound in your browser. Shipped unmodified. - @mediabunny/mp3-encoder 1.61.3 (MPL-2.0), includes LAME 3.100 (GNU Library GPL v2) MP3 encoding by LAME: https://lame.sourceforge.io Shipped unmodified as a separate file (/mp4-to-mp3/assets/mediabunny-mp3-encoder-.js), loaded only for the first MP3. You may replace that file with your own build. Complete source (LAME, the encoder, Mediabunny) and the LGPL-2.0 and MPL-2.0 texts: /mp4-to-mp3/licenses/ (README.txt) - fflate (MIT) https://github.com/101arrowz/fflate - Bricolage Grotesque, DM Sans (SIL OFL 1.1) /mp4-to-mp3/fonts/