Convert OGG to OPUS
Re-encode Vorbis audio as Opus, its modern successor, straight in the browser. All processing happens on your machine and your files never leave it.
Why convert OGG to OPUS?
Ogg Vorbis had a great run as an open, royalty-free codec, and it is still the default audio format in game engines like Unity and Godot. Opus is its successor, and at the same bitrate it outperforms Vorbis, with the biggest gains at low and medium rates. Developers make this conversion when a project targets WebRTC or Discord, both of which speak Opus natively, or when they want smaller audio in a web build. Others are simply modernizing old Vorbis music rips or soundboard clips into the current standard. Both codecs can sit inside an Ogg container, so the extension changes from .ogg to .opus even though the container family stays the same.
Quality and file size
Vorbis to Opus crosses between two lossy codecs, so expect a small generation loss even though Opus is the stronger format. Nothing Vorbis already discarded can be reconstructed; the encoder can only work with what survives in the .ogg file. Give the Opus output plenty of bitrate, 256 kbps leaves comfortable margin, and avoid bouncing between the two formats repeatedly. If your Vorbis files came from a lossless source you still have, encoding fresh Opus from that source will always beat transcoding.
OGG to OPUS: common questions
Aren't OGG and Opus the same thing?
No, and the confusion is understandable. Ogg is a container; your .ogg files hold the older Vorbis codec, while .opus files hold Opus audio in that same container family. This tool re-encodes the audio itself, not just the wrapper.
Is there a quality cost going from Vorbis to Opus?
A small one, since both codecs are lossy and re-encoding cannot recover what Vorbis discarded. Pick 256 kbps for the output and the added loss will be very hard to hear. Just avoid converting back and forth between the two.
Do my game audio files get uploaded anywhere?
No. The whole pipeline is FFmpeg in WebAssembly running in your browser, so project assets never leave your machine. Nothing is uploaded, logged, or retained.
Should I use Opus or Vorbis in my game engine?
Check the engine first. Unity and Godot import Ogg Vorbis out of the box, while Opus support varies by version and platform. Opus wins on quality per kilobyte; Vorbis wins on drop-in compatibility in most engines today.
Who makes this?
We're the small team behind Xport Studio, a private, fully offline app for AI vocals, stems, and mastering. These free tools are side experiments we wanted to share. No upsell, but if you're curious about the bigger thing, take a look.