Turn an MP3 into an OGG file using your browser's native Opus encoder — a modern, efficient, open format.
The MP3 to OGG converter turns MP3 audio (MPEG-1/2 Layer III) into OGG (Ogg container, usually with Vorbis or Opus audio) directly in your browser. OGG/Opus is open, efficient and well suited to web, games and apps with no licensing issues.
MP3 is the most universally supported lossy format; plays on virtually every phone, car stereo, browser and editor. OGG is a fully open, patent-free format used in games, Linux and web audio. Both MP3 and OGG are lossy, so this is a transcode: some extra quality is lost. Pick a bitrate at or above the original’s to limit the damage, and keep the original file. Your browser’s own Opus encoder is used, so quality equals what a browser or WebRTC call would produce.
Your file is decoded to 32-bit floating-point samples by the browser’s own audio decoder — and at the file’s own sample rate, not a resampled one. You can optionally resample or switch channels. It is then encoded to OGG on your device; for a lossy target the result is decoded again for the preview, so you hear what you will get. Typical size: about 0.7–1 MB per minute at ~128 kbps.
Source format facts: MP3 files are lossy; usual bandwidth: typically low-passed at 16–20 kHz depending on bitrate. Target facts: OGG is lossy; usual bandwidth: quality-based; up to 20 kHz+.
Smaller audio for engines.
Open formats for the web.
Native support.
Efficient speech at 48–64 kbps.
| From | MP3 — MPEG-1/2 Layer III |
|---|---|
| To | OGG — Ogg container, usually with Vorbis or Opus audio |
| Direction | lossy → lossy |
| Typical size | about 0.7–1 MB per minute at ~128 kbps |
| Tags | MP3: ID3 → OGG: Vorbis comments |
Browsers expose their Opus encoder through real-time recording.
Yes — Opus is state of the art for the bitrate.
It's OGG containing Opus audio — the modern standard your browser actually ships. This is produced by your browser's own native encoder in real time, so conversion takes about as long as the clip's length.
Going to WAV is lossless. Going to MP3 uses a standard 192kbps encode by default (adjustable), which is transparent for most listening but is a lossy step if your source was uncompressed.
No — the file is decoded and re-encoded entirely in your browser using the Web Audio API and, for MP3, a small bundled encoder. Nothing is sent anywhere.
This tool runs entirely in your browser using the Web Audio API. Nothing is uploaded, stored or shared — there is no server to send your file to, so it works offline once the page has loaded.
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