Someone sent a voice note your player refuses to open. OPUS to MP3 solves it: drop the files anywhere on this page and each one is decoded, pushed through LAME at 192 kbps by default, and saved as an MP3. Batch a whole chat's worth at once; nothing uploads.
Why every messaging app sends you OPUS
OPUS is the best voice codec ever made, which is why WhatsApp, Discord, Telegram and Signal all use it for voice messages and recordings. The catch: export one and try to open it. Windows Media Player, older phones, car stereos, transcription tools and most email recipients have no idea what to do with it. MP3 is the format that has opened on everything since the 90s, so that's what you get here.
For evidence, records and keeping
Voice notes get converted for real reasons: saving a family member's messages, submitting audio to HR or a lawyer, transcribing an interview, archiving a Discord call. Those are exactly the recordings you should never hand to a random converter server. Here they never leave the page: no upload, no account, no copy sitting in someone's cloud bucket. Convert, download, done.
FAQ
Are my voice messages uploaded?
Never. Voice messages are personal, and yours are never uploaded, stored, or heard by anyone. The conversion happens instantly and privately on your own hardware. Skeptical? Here's how to check.
WhatsApp voice notes specifically?
Yes. Export the chat or save the audio file (it will be .opus, sometimes .ogg) and drop it here. Batch an entire conversation at once if you want.
What quality should I pick?
The default is 192 kbps, the highest here, so you never have to wonder whether you gave up quality. Voice notes are speech, so 96 or 128 also sound identical and make smaller files.