MP3 converter
MP3 is the audio equivalent of JPG: not the most modern choice, but the one that works everywhere without questions. The converters below run ffmpeg compiled to WebAssembly inside your browser, so recordings, voice memos and music files are converted without being uploaded to anyone.
What is MP3?
MP3 is the audio format that ate the world in the late 1990s, and it remains the most universally supported way to store sound: lossy compression at roughly a tenth of CD size, playable on literally anything with a speaker. Newer codecs like AAC and Opus beat it on quality per kilobyte, but no format comes close to its compatibility across car stereos, ancient MP3 players, browsers, editing software and upload forms.