Convert OPUS to MP3.
Turn WhatsApp voice notes into MP3s that play anywhere.
Drop OPUS files here
or browse your files
Paste with ⌘V · or drop files anywhere on the page
Files never leave your device. Everything runs in your browser, nothing touches a server — tools you've used even work offline.
OPUS is what messaging apps use for voice — tiny and great-sounding, until a car stereo, portal or editor refuses it. Convert .opus files to MP3 entirely in your browser: drop the notes, pick a bitrate, download audio that plays on everything.
How it works
- Drop files anywhere on the page, click to browse, or paste with ⌘V.
- Pick a quality or preset — or set an exact target size and let the tool find it.
- Compress, compare before/after, and download — individually or as a ZIP.
From chat export to playable MP3
Export the conversation (WhatsApp: chat → Export, including media), pull out the .opus attachments, and drop them here in one batch. MP3 at 96–128 kbps is transparent for speech and opens in every transcription portal and player. Files already named .ogg convert the same way via OGG to MP3; to keep Opus but hit a size cap, use the audio tool.
Frequently asked questions
Where do OPUS files come from?
Mostly voice messages — WhatsApp, Telegram and Signal exports all use Opus, and so do many voice recorders and game clips. It is a modern, efficient codec that older software simply never learned.
Which bitrate for voice notes?
96–128 kbps MP3 captures everything a phone microphone recorded. Go 192 kbps only when the source is music; higher bitrates than the source just spend bytes.
Can I batch-convert exported chats?
Yes — drop every .opus file from the export at once; each becomes its own MP3 and the lot downloads as one ZIP. Nothing is uploaded, which matters for private conversations.
Is it private?
Yes. The audio is decoded and re-encoded entirely in your browser — recordings never leave your device, and the server does nothing but deliver this page. Voice memos, interviews, demos: none of it is uploaded anywhere. Want proof? Run one file through, switch your connection off, and run another — it still works.