MP3 to OGG

What this does

MP3 plays on more things than any other audio format, so a conversion away from it is nearly always someone else’s requirement rather than a preference. OGG is the container and Vorbis is almost always the codec inside it, and what makes it worth requiring is the licence: Vorbis is free of patents and of royalties, which is why game engines, open-source projects and audio pipelines settled on it.

MP3 is the format nearly everything already plays, so the file you are starting from is not the problem — the destination is. This is a conversion made to satisfy a tool, an engine or an upload rule that will not take MP3.

The one thing this conversion cannot do

Both formats are lossy, so this is a second compression pass over audio that has already been through one. The Vorbis encoder cannot hear what the MP3 encoder discarded, so it cannot put it back — and because it is working from a damaged copy rather than from the original recording, a higher bitrate buys you fidelity to the MP3, not to the music. The practical rule follows from that: set the output at least as high as the source MP3 was encoded at. Going lower discards a second time; going far higher grows the file without improving anything. If you still have whatever the MP3 was made from — a WAV, a FLAC, a CD rip — convert that instead and skip a generation.

Nothing is uploaded

The conversion happens inside this page. Your file is read by the browser, converted here, and saved straight back to your downloads. It is never sent to a server, so there is no upload wait and no size cap beyond what your own device can hold.

Open your browser’s developer tools, switch to the network panel, and convert a file. You will see the converter itself download once, and no upload of your audio at all. That is the whole difference between this and a site that converts on a server, and what that difference actually means is worth a read.

The first conversion is slower

The converter is about 32 MB and downloads the first time you use it, which is the one moment this page is not instant. After that it is cached, and later conversions start immediately, even offline. So do later visits.

Questions