About this m4a to ogg converter
M4A is AAC audio in an MP4 container, the default for iPhone recordings, iTunes and Apple Music downloads. OGG (Ogg Vorbis) is an open, royalty-free compressed format used by games, Linux apps and many open-source tools. The conversion runs in your browser with ffmpeg compiled to WebAssembly, so the file never leaves your device and there is no size limit beyond your memory. Both formats are compressed, so pick a bitrate at least as high as the source to avoid audible loss.