Audio · Windows 10 and 11

Convert Opus to MP3 on Windows, offline.

Exported WhatsApp voice messages and many call recordings are .opus files that most players and editors won't open. MP3 plays everywhere.

Nothing is uploaded
Many files at once
No sign-up
No other software needed

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How to convert Opus to MP3

Select your Opus filesIn File Explorer or on the desktop. One file, or a hundred.
Start dragging, then tap ShiftThe Convert wheel opens right under your cursor, with every format this file can become.
Drop on MP3Crustify converts on your PC and saves the result next to the original. That's it.

First time? Download Crustify and install it. It waits in the tray, using about 3 MB of memory, until you drag a file.

Convert Opus

Convert to MP3

What you get

Saved as a high-quality MP3, around 190 kbps.
Your voice notes stay on your PC. Nothing is uploaded, which matters for private conversations.
Convert a whole exported chat's voice notes at once.
Each MP3 is saved next to its original, with the same name.
Your original file is never changed. If the new name is taken, Crustify adds (1), (2) and so on.
Long files show their progress in a small panel, and you can cancel at any time.

About the formats

Opus Opus audio

A modern audio codec built for voice and streaming. WhatsApp voice messages and many call recordings are Opus. It is excellent at tiny sizes, but most music players and editors won't open .opus files.

MP3 MPEG Audio Layer III

The most compatible audio format: every phone, car stereo, speaker and app plays it. MP3 makes small files by discarding sound you're unlikely to hear, so it suits listening, not editing.

Questions

Opus to MP3, answered.

Why is the MP3 bigger than the Opus file?

Opus is very efficient for voice. MP3 needs more data for the same sound, so the files grow.

Can I get the text of a voice note?

Not with Crustify. It converts the audio; it doesn't transcribe it.

Is Crustify free?

You can use everything free for 7 days, with no key or card. After that it's ₹49 once for a lifetime licence on up to 2 PCs. No subscription.

Convert Opus to MP3 without uploading a thing.

Crustify converts images, video, audio, PDFs and documents on your PC, offline.