Free tool
MP3 to OGG converter
Drop an MP3 here to convert MP3 to OGG in your browser: the page writes Opus sound into an .ogg file at 32, 64 or 128 kbps, the same kind of file Telegram and WhatsApp use for voice messages, and nothing is uploaded.
- Free
- Opus inside the .ogg
- Nothing is uploaded
Save as
OGG quality
Opus sound in an OGG file, the format of WhatsApp and Telegram voice messages. Not Ogg Vorbis.
Drop your MP3 file here, or Choose your MP3 file
Any audio or video file, up to 1 GB and 2 hours. It’s converted in your browser; nothing is uploaded.
MP3 encoding by LAME, open-source software.
Is the MP3 a recorded call or lecture? NoteOwl imports MP3 recordings as they are and turns them into searchable transcripts on your Mac, with each speaker labelled.
How it works
How do you turn an MP3 into an OGG file?
OGG is already chosen. Set a bitrate and drop the MP3: your browser decodes it, then its own Opus encoder writes the sound at 48 kHz into an Ogg file. Five minutes of MP3 took three to five seconds. Listen to the result before you download it.
- 1
Set the bitrate
128 kbps, the default, for music. 64 kbps for talks and podcasts, or 32 kbps when the smallest file matters most, as for a spoken message.
- 2
Add the MP3
Drag it onto the box or choose it. Constant or variable bitrate, mono or stereo: any MP3 works, and it stays on your device.
- 3
Keep the OGG
Play it in the page, then save it. The name stays the same apart from the .ogg ending, and the title and artist come along.
How much smaller is the OGG than the MP3?
That depends only on the bitrate you pick, never on the MP3’s. A five-minute, 7.2 MB MP3 at 192 kbps came out at 4.85 MB as 128 kbps Opus, 2.42 MB at 64 kbps and 1.22 MB at 32 kbps, about a sixth of where it started.
- 128 kbps (default)
- What’s insideOpus, stereo, 48 kHz
- Size4.85 MB
- Share of the MP3About two-thirds
- Took (Chrome / WebKit)3.4 s / 3.7 s
- 64 kbps
- What’s insideOpus, stereo, 48 kHz
- Size2.42 MB
- Share of the MP3About a third
- Took (Chrome / WebKit)2.9 s / 3.1 s
- 32 kbps
- What’s insideOpus, stereo, 48 kHz
- Size1.22 MB
- Share of the MP3About a sixth
- Took (Chrome / WebKit)5.3 s / 4.0 s
| OGG setting | What’s inside | Size | Share of the MP3 | Took (Chrome / WebKit) |
|---|---|---|---|---|
| 128 kbps (default) | Opus, stereo, 48 kHz | 4.85 MB | About two-thirds | 3.4 s / 3.7 s |
| 64 kbps | Opus, stereo, 48 kHz | 2.42 MB | About a third | 2.9 s / 3.1 s |
| 32 kbps | Opus, stereo, 48 kHz | 1.22 MB | About a sixth | 5.3 s / 4.0 s |
Is an OGG file Vorbis or Opus?
It can be either. Ogg is a container, an open format from the Xiph.Org Foundation, and the sound inside is usually Vorbis, the older codec, or Opus, the newer one. This converter writes Opus, the codec behind Telegram and WhatsApp voice messages.
Vorbis reached version 1.0 in 2002 and became the usual sound format of games, game engines and open-source music. Opus was standardised by the IETF in 2012 for speech and music alike, reaches down to 6 kbps, and is what chat apps and calls in a browser use today.
- Standardised
- VorbisXiph.Org, version 1.0 in 2002
- OpusIETF RFC 6716, 2012
- Where you meet it
- VorbisGame sound, mods, open-source music
- OpusVoice messages, browser calls
- Decoded at
- VorbisThe rate it was made at
- Opus48 kHz
- Made by this page
- VorbisNo: no browser can encode it
- OpusYes, at 32, 64 or 128 kbps
| Vorbis | Opus | |
|---|---|---|
| Standardised | Xiph.Org, version 1.0 in 2002 | IETF RFC 6716, 2012 |
| Where you meet it | Game sound, mods, open-source music | Voice messages, browser calls |
| Decoded at | The rate it was made at | 48 kHz |
| Made by this page | No: no browser can encode it | Yes, at 32, 64 or 128 kbps |
Will a game that needs Ogg Vorbis accept this file?
No. Browsers carry an Opus encoder but none for Vorbis, so every .ogg made here holds Opus. Software that reads only Ogg Vorbis, such as Minecraft resource packs and many older games, won’t play it, even though the name ends in .ogg.
For those, start again from the original MP3 in a desktop audio editor that writes Ogg Vorbis; Audacity’s OGG export does. Use this page where Opus is welcome: voice messages, chat bots, web pages and apps built on the newer codec.
Where does an Ogg Opus file play?
In Chrome, Firefox and Safari 26, in VLC and on Android phones. Telegram’s Bot API posts an .ogg with Opus sound as a playable voice message, so a bot can send converted MP3s as voice notes rather than as music files.
Some car stereos, older MP3 players and plenty of upload forms won’t take .ogg at all. Keep the MP3 for those, and make the OGG only for the places that ask for Opus.
Does an MP3 sound any better once it is Opus?
No. The MP3 lost detail when it was first made, and Opus is a lossy codec too, so a second encoding keeps what was left, minus a little. Convert for a smaller file or because something asks for Opus, and keep the MP3 as your master copy.
Can NoteOwl turn a spoken MP3 into notes?
Yes, on a Mac, and the MP3 needs no converting first. NoteOwl imports MP3 recordings, transcribes them with on-device AI models, labels each speaker and keeps every transcript searchable. Voice notes you record in NoteOwl itself are free, and so is dictation into any app.
FAQ
MP3 to OGG: common questions
Does my MP3 leave my device during the conversion?
No. The MP3 is opened from your own storage, decoded by your browser and encoded to Opus by the browser’s built-in encoder, all inside the page. Nothing is uploaded, and there is no account to create.
Can I make an Ogg Vorbis file here?
No. No browser includes a Vorbis encoder, so NoteOwl’s converter always puts Opus inside the .ogg file. If a game, mod or app insists on Ogg Vorbis, export the MP3 from a desktop audio editor that writes Vorbis, such as Audacity.
Which OGG bitrate should I pick for speech?
32 or 64 kbps. Opus was designed to carry voices at low bitrates, and five minutes at 32 kbps takes about 1.2 MB. Keep 128 kbps, the default, for music. All three settings are written at 48 kHz.
Why is the OGG 48 kHz when my MP3 was 44.1 kHz?
Opus is built around 48 kHz, so the browser’s encoder is always handed the sound at that rate. The file plays at the same speed and pitch as the MP3; only the number in its details changes.
Will Safari play the OGG file?
Safari 26 does: it plays Ogg Opus files, as Chrome and Firefox do. If an app on your device refuses the file, keep the MP3 for it, or save an M4A from the same converter instead.
Are the MP3’s title and artist kept?
Yes. Title and artist tags are copied into the OGG’s own tags, and the new file keeps the MP3’s name with .ogg in place of .mp3.
What is the longest MP3 it can convert?
Two hours, or 1 GB. Because Opus is written at a constant bitrate, an hour comes to about 58 MB at 128 kbps and about 14.6 MB at 32 kbps, whichever browser you use.
Keep exploring
More audio converters
- Audio converterConvert audio and video files to MP3, WAV, M4A or OGG in your browser: M4A, FLAC, AIFF, OGG, Opus, WebM, MP4 and MOV in; nothing is uploaded
- MP4 to WAV converterTake an MP4 video’s sound out as an uncompressed WAV in your browser, at the video’s own 48 kHz or 44.1 kHz; nothing is uploaded
- OGG to MP3 converterConvert OGG files to MP3 in your browser, Opus voice messages and Vorbis music alike; nothing is uploaded
- M4A to WAV converterConvert M4A to WAV in your browser, iPhone voice memos included: AAC or Apple Lossless in, 16-bit WAV out; nothing is uploaded
Spoken MP3s into searchable notes on a Mac
Free to download. Runs entirely on your Mac.
macOS 26 or later · Apple Silicon (M1 or newer) · 16 GB memory minimum, 24 GB recommended
About NoteOwl
NoteOwl is private AI meeting notes and memory for the Mac. It captures meetings without a bot joining the call, labels every speaker, writes summaries and action items, and builds a memory of every conversation that you can chat with — fully offline, because the speech recognition and the AI run on the Mac itself. Dictation into any app is free; Pro is a one-time purchase.
NoteOwl pricing: what’s free and what Pro adds
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