Convert OPUS to OGG (Vorbis) Online
Convert Opus audio to OGG Vorbis, free, in your browser.
.opus · up to 100 MB
What it's for
Opus to OGG Vorbis: compatibility with legacy software
Legacy game engines
Unity 4.x and other pre-2015 engines accept Vorbis in OGG but not Opus. Convert your audio assets without rework.
Hardware players
Car players, living-room players, and embedded systems with non-updatable firmware recognize Vorbis but ignore Opus.
Metadata intact
Vorbis Comment tags (artist, album, track number) are automatically transferred to the resulting OGG file.
100% private
Your audio is never uploaded to any server. Complete local processing with FFmpeg.wasm in your browser.
How it works
Three steps, no hassle
Upload your Opus file
Drag or select your .opus file. Up to 200 MB, no signup or installation required.
Automatic conversion
FFmpeg.wasm transcodes Opus to Vorbis directly in your browser. No servers involved.
Download your OGG
Get your .ogg file ready for legacy players, game engines, or any software that requires Vorbis.
FAQ
Got questions?
Opus (RFC 6716, September 2012) outperforms Vorbis at all bitrates, but real legacy scenarios still demand Vorbis: Unity 4.x and earlier versions only accept Vorbis in their native audio pipeline, hardware players manufactured before 2015 with non-updatable firmware, living-room CD/DVD players with OGG-Vorbis decoding but no Opus support, and some embedded industrial systems with fixed ROM decoders. In these cases, converting modern Opus audio to the OGG Vorbis format those systems understand is the correct practical solution.
Yes, there is a generation loss because Opus is decoded to PCM and then re-encoded to Vorbis, both being lossy codecs. The audible impact depends on the original Opus bitrate: Discord voice messages at 32 kbps will show more artifacts than musical audio at 160 kbps. To minimize degradation, use the highest Vorbis bitrate available (320 kbps VBR) when fidelity matters. For voice content, the difference is often imperceptible even at moderate bitrates.
Both are open standards from Xiph.org but with different architectures. Vorbis, published in 2000, uses pure MDCT transforms, suitable for music but not designed for voice or low latency. Opus combines the SILK codec (voice, low latency) and CELT codec (music, high quality) with dynamic switching. Xiph.org declared Opus the official successor to Vorbis after the publication of RFC 6716 in September 2012 and no longer recommends Vorbis for new projects.
Discord accepts both Opus and Vorbis in OGG containers. YouTube and most modern web platforms prefer Opus but accept Vorbis. The primary use case for this conversion is legacy software or hardware that specifically requires Vorbis, not current web platforms.
Yes. Both Opus and Vorbis use the Vorbis Comment system for metadata, so TITLE, ARTIST, ALBUM, DATE, TRACKNUMBER, GENRE, and COMMENT fields are automatically transferred to the resulting OGG Vorbis file without loss.
For voice audio (Discord messages, WhatsApp, meetings), 96–128 kbps VBR is sufficient. For music, 160–192 kbps VBR delivers transparent quality for most listeners according to Hydrogenaudio MUSHRA studies. At 320 kbps VBR you reach the maximum Vorbis can produce. Remember this is a lossy-to-lossy transcode, so the output bitrate cannot recover quality lost in the original Opus file.
Convert Opus to OGG Vorbis: compatibility with legacy players and game engines
Opus is the most modern open-source audio codec from Xiph.org, standardized in RFC 6716 published in September 2012. It combines Skype's SILK codec for low-latency voice with Xiph's CELT codec for high-quality audio, delivering superior performance to Vorbis, MP3, and AAC across all bitrate ranges. Discord, WhatsApp Web, Telegram, WebRTC, and most modern communication applications use Opus as their native codec. However, Opus adoption in older software was gradual: Unity 3D did not add native Opus decoding support in its AudioClip pipeline until version 5.0, released in March 2015; earlier versions (Unity 4.x and before) require Vorbis in an OGG container for compressed audio in the engine. Living-room CD or DVD players manufactured before 2014 with the ability to play OGG files may support Vorbis per the standard they implemented in their firmware, but not Opus, which postdates them. Car audio systems with non-updatable firmware, DAB+ radio devices with fixed audio decoders, and certain industrial embedded systems with ROM decoders present the same situation. For these scenarios, converting Opus to OGG Vorbis is the technically correct and necessary solution, not merely a preference.
Converting Opus to Vorbis is a lossy-to-lossy transcode: the Opus audio is first decoded to PCM (uncompressed audio) and then re-encoded to Vorbis, introducing a second generation of compression loss. This behavior is inherent to any transcode between two lossy codecs and has no perfect solution. The actual audible impact depends primarily on the original Opus bitrate: Discord voice messages encoded at 32 kbps already have limited quality, and re-encoding to Vorbis at 96 kbps will introduce additional artifacts, though moderate in the midrange frequencies. Musical audio at 160 kbps Opus transcoded to Vorbis at 192 kbps will have a practically imperceptible degradation in casual listening. The technical recommendation is to use the highest Vorbis bitrate reasonably possible for the target application, and reserve this conversion for specific compatibility cases where Vorbis is a requirement of the receiving software. Vorbis is mature and stable technology: released by Xiph.org in 2000, it reached version 1.3.7 in 2020, and although Xiph.org recommends Opus for new projects, Vorbis will continue to be decoded by software that already implements it indefinitely. Vorbis Comment metadata tags, used by both Opus and Vorbis, are automatically transferred to the resulting OGG file, preserving artist, album, track number, genre, and ReplayGain values if present in the original Opus file.
Convertir.ai performs the Opus to OGG Vorbis conversion entirely in the browser using FFmpeg.wasm, the WebAssembly build of FFmpeg. The process decodes the Opus file with libopus to 48 kHz PCM (the native sample rate of Opus per RFC 6716), applies if necessary a resample to 44.1 kHz using FFmpeg's Kaiser-windowed sinc filter for maximum quality, and encodes with libvorbis using VBR mode at the user-selected quality level. The output container is OGG with a .ogg extension, the standard container for Vorbis per the Xiph.org specification. Vorbis Comment metadata from the original Opus file (TITLE, ARTIST, ALBUM, DATE, TRACKNUMBER, GENRE, COMMENT, ALBUMARTIST, DISCNUMBER, and ReplayGain values if present) are automatically transferred to the comment block of the resulting OGG Vorbis file without modification, ensuring players that use those tags to organize their music library read them correctly. Processing occurs entirely locally in the user's browser: no audio file is sent to any external server at any point. There is no per-session file limit, no watermark, no signup required, and the service is completely free.