MP3 to OGG

Convert MP3 to OGG in three steps

1. Choose one or more MP3 files, or try the included sample.
2. Pick your Opus bitrate and press Convert to OGG. Keep this tab open while it works.
3. Listen to the preview and save individual files or download the batch as a ZIP.

Why the output is Opus, not Vorbis

An .ogg file can hold several codecs. The two common ones are Vorbis, from the early 2000s, and Opus, its successor. This converter writes Opus because it is the codec current browsers can encode natively through WebCodecs, and because it sounds better than Vorbis at the same bitrate. Most modern players, all current browsers, Discord, and Android accept Ogg Opus. Some older car stereos, portable players, and game engines look for Vorbis specifically and will refuse an Opus file. If a device rejects the result, that is almost always the reason, and MP3 or WAV is the safer choice for it.

What happens to the audio

The converter decodes your MP3, resamples it to 48 kHz, the rate Opus always works at, and encodes Opus with the encoder built into your browser. Both MP3 and Opus are lossy, so this is a second round of compression: it cannot restore detail the MP3 encoder removed, and it adds a small loss of its own. Opus is efficient, so that loss is hard to hear at sensible bitrates. Keep your original MP3 as the master, and convert from it again if you ever need a different bitrate.

Choosing a bitrate

128 kbps is the default and suits music: Opus at that rate sounds very close to the source for most listeners. 96 kbps still sounds good for music and saves a quarter of the space. 64 kbps is plenty for speech, podcasts, and voice clips. 160 or 192 kbps leaves the most headroom for a second lossy step, which is worth it for music you will keep, but going above the bitrate of the original MP3 only makes the file larger. A 128 kbps OGG uses just under 1 MB per minute.

Browser support and batches

Opus encoding needs a recent browser. Current versions of Chrome, Edge, Firefox, and Safari include it; if a conversion fails on an older version, update the browser or try another one. You can choose several MP3s at once, convert them in one batch, listen to each result, and download them one by one or together as a ZIP. Everything happens on your device, so unreleased music and private recordings stay with you, and there is no account or watermark.