Convert OPUS to MP3

Tested on Windows 11, 24 October 2026

Convert OPUS audio to MP3 in your browser or in the Filoshi app for Windows. MP3 is lossy: Filoshi uses a high-quality setting, and you can choose the bitrate. Nothing is uploaded.

Get Filoshi · $29Many files at once, no size limit, on Windows.

How to convert OPUS to MP3 in your browser

  1. 1
    Drop your OPUS file
    Drag it onto Filoshi above, or press Choose your OPUS file to pick it on your computer.
  2. 2
    Filoshi converts it
    MP3 is chosen already. FFmpeg, compiled to WebAssembly, converts it inside this browser tab.
  3. 3
    Save your MP3 file
    Download it when it is ready. Nothing was sent to a server.
Source format

What is OPUS?

Opus Audio (.opus). Opus is an open, royalty-free codec standardised by the IETF in 2012. It sounds very good at low bitrates for both speech and music, and it is the codec of WebRTC video calls and many voice-message apps.

Common use: Voice messages, calls, streaming, podcasts

Output format

What is MP3?

MPEG Audio Layer III (.mp3). MP3 is the most widely supported audio format. It uses lossy compression: sound the ear is unlikely to notice is thrown away, so a song takes a few megabytes. Every phone, car stereo and music app plays it.

Common use: Music, podcasts, audiobooks and general audio sharing

Questions about OPUS to MP3

Is converting OPUS to MP3 free?
Yes, one file at a time: the converter on this page runs in your browser, files up to 100 MB, no sign-up. The Filoshi desktop app ($29 once, for Windows) converts many files at once and has no size limit.
Does converting OPUS to MP3 lose quality?
Yes, a little. MP3 is a lossy format, so some detail is thrown away when the file is saved. Filoshi uses a high-quality setting by default, and you can choose the bitrate in the file viewer. OPUS is lossy too, so this is a second round of compression; convert from the original, not from earlier conversions.
Is my OPUS file uploaded anywhere?
No. The converter on this page runs in your browser with FFmpeg compiled to WebAssembly; your OPUS file is read and converted on your device and never sent to a server. The desktop app works the same way, offline.
Has OPUS to MP3 been tested?
Yes. OPUS to MP3 is one of the 1,841 conversions that passed Filoshi's automated test matrix on Windows 11.
Can I convert many OPUS files at once?
Yes, in the desktop app. Drop as many OPUS files as you like on the window, pick MP3 once for all of them, and each file shows its own progress. The new files appear next to the originals, which are never changed.

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Convert to MP3

WAV to MP3AAC to MP3OGG to MP3FLAC to MP3M4A to MP3WMA to MP3AIFF to MP3ALAC to MP3

Need OPUS to MP3 for many files?

The browser converter handles one file at a time. The Filoshi app for Windows converts as many as you drop, runs offline, and has 1,841 tested conversions.

Get Filoshi · $29