Convert OGG to MP3
Convert OGG Vorbis and Opus audio to MP3 locally. Drop a whole folder, pick a bitrate, and download each file or all of them zipped.
- Runs in your browser
- Files are never uploaded
- Free, no account
First use downloads the 10 MB video engine from this site. After that it is cached and works offline. It is WebAssembly served by onthisdevice.com — never a third-party CDN — and your file is still processed entirely on your own device.
Ogg is a container, not a codec
This trips people up constantly. .ogg describes the wrapper; the audio inside is
usually Vorbis, but since about 2015 it is increasingly Opus. A file named .oga is
the formally correct extension for Ogg audio, and .ogv is Ogg video. Nothing in
the filename tells you what the decoder will find.
That is why "my Ogg file won't open" has so many different causes. A player that supports Vorbis may not support Opus in the same container. This page decodes both, along with the handful of Ogg FLAC files in circulation, so the distinction stops mattering.
Where Ogg files come from
- Games. Vorbis was the default soundtrack format for a generation of PC games because it is patent-free and had no licensing fee, unlike MP3 at the time.
- Wikipedia and Wikimedia Commons. Their audio is Ogg on principle — the projects require freely licensed, patent-unencumbered formats.
- Spotify. Streams are Ogg Vorbis, which is why offline caches and some third-party rips arrive in this format.
- Linux desktops. GNOME Sound Recorder, Audacity’s default export on some builds, and many system sounds.
- Messaging apps. Telegram voice notes are Opus in Ogg, usually named
.ogg.
Matching the bitrate
MP3 is an older and less efficient codec, so you cannot compare bitrate numbers between the two directly — you need a little more MP3 to hold the same perceived quality.
| Source | Approximate bitrate | MP3 setting |
|---|---|---|
| Vorbis quality 3 | 112 kbps | 128 kbps |
| Vorbis quality 5 (common default) | 160 kbps | 192 kbps |
| Vorbis quality 8 | 256 kbps | 256–320 kbps |
| Spotify high-quality stream | 320 kbps Vorbis | 320 kbps |
| Opus voice note | 24–64 kbps | 128 kbps is plenty |
Going above the recommended number does not recover anything — the information the Vorbis encoder discarded is gone — it just makes a bigger file. Going far below it stacks a second round of lossy artefacts on top of the first, which is where conversions start to sound watery.
What happens to the tags
Ogg stores metadata as Vorbis comments: free-form KEY=value pairs with no fixed
schema. MP3 uses ID3, which has a fixed set of frames. FFmpeg maps the standard fields — title,
artist, album, date, track number, genre — onto ID3v2.3 automatically. Custom Vorbis comments
that a game or a ripper invented have no ID3 equivalent and are dropped, and embedded cover art
survives in most but not all layouts.
Should you convert at all?
Only if something in your chain cannot read Ogg. Vorbis at a given bitrate is modestly better than MP3, and Opus is dramatically better at low bitrates, so every conversion is a small step down. If your phone, car and computer all play Ogg — and most modern ones do — keep the originals. Convert for the one stubborn device, not for the library.
Batch conversion without a meter
Select an entire folder of game audio or a whole Telegram export. The queue takes up to fifty files at a time, converts them sequentially with a progress row each, and offers one ZIP at the end. Nothing is uploaded, so there is no daily allowance to run out of and no size limit beyond your own memory — the exact opposite of the free tier every upload converter runs.
Related tools
For WhatsApp, Signal and Discord audio specifically, Opus to MP3 is the same converter with the right dropzone and Opus-focused guidance. For lossless libraries, see FLAC to MP3. To combine several clips first, use the audio joiner.
Questions
What is actually inside an .ogg file?
Ogg is a container. It normally holds Vorbis audio, but modern files — especially voice notes and game assets — often hold Opus instead, and the extension does not tell you which. Both are decoded here, so you do not need to know.
Why does anything still use OGG?
It is patent-free, which made it the default for open-source games, Wikipedia audio, Spotify streams and many Linux tools. The trade-off is that a lot of car stereos, older phones and hardware players have never supported it, which is the usual reason to convert.
Which bitrate matches my original?
Vorbis at quality 5 is roughly 160 kbps and Opus voice notes are often 32–64 kbps. MP3 is a less efficient codec, so match or slightly exceed the source number: 192 kbps MP3 for a 160 kbps Vorbis file, 128 kbps for a 64 kbps Opus voice note.
Do the tags survive?
Ogg uses Vorbis comments and MP3 uses ID3, which are different formats with different field names. Basic metadata that FFmpeg can map across is carried over as ID3v2.3; unusual custom fields, cover art in exotic layouts and chapter data may not survive.