Audio Converter

Audio arrives in whatever format the device that made it produces: M4A from an iPhone, OGG or OPUS from a messaging app, WAV from a recorder, FLAC from a music collection. Converting is usually about making a file something else can actually open.

Four output formats. MP3 plays on everything ever made and is the answer when compatibility is the problem. M4A sounds better at the same size and is what Apple devices prefer. OGG is open and good quality but unsupported across Apple's ecosystem. WAV is uncompressed — lossless and very large, which is what an audio editor wants.

The bitrate controls size against quality, and it is worth knowing which way it works. Converting from one compressed format to another always loses a little more, because the file is decoded and re-encoded; raising the bitrate cannot put back what was already gone. Converting from a lossless source such as WAV or FLAC does not have that problem, and is where a high bitrate genuinely earns its size.

There is also a mono option, which halves the size. For a voice recording, a phone interview or a lecture that is free — those are rarely in real stereo to begin with. For music it is not, and it will be obvious.

Everything runs in your browser using a WebAssembly build of ffmpeg served from this site, so a voice memo or a recorded conversation is never uploaded anywhere.