# How to Convert Opus to MP3 on a Mac (WhatsApp and Telegram Voice Notes)

Canonical: https://filevale.com/guides/how-to-convert-opus-to-mp3-on-mac/
Updated: 2026-10-31

> Turn .opus files such as WhatsApp and Telegram voice notes into MP3 on your Mac, right in the browser. Nothing is uploaded and nothing to install.

To convert Opus to MP3 on a Mac, open the [Opus to MP3 Converter](/opus-to-mp3/) in Safari or Chrome, drop your `.opus` file on the page and download the MP3. There is nothing to install, and the file never leaves your Mac. This guide covers the steps, where Opus files come from, and what to do if your file is an `.ogg`, `.webm` or something else.

## What is an Opus file?

Opus is a modern, efficient audio codec. It is what WhatsApp and Telegram use for voice notes and what many web calls use, so the files you save from those apps often end in `.opus` or `.ogg`. The catch is that a lot of players and editors expect MP3, which is the most compatible audio format there is. Converting gives you a file you can open in almost any app, attach to an email or drop into a video project.

![Opus to MP3 in the Filevale iPhone app: a WhatsApp voice note converted to MP3.](https://filevale.com/assets/app/opus-to-mp3.webp)

## Convert Opus to MP3 in your browser

[Open Opus to MP3 Converter](https://filevale.com/opus-to-mp3/)

1. Open the Opus to MP3 Converter and drop your OPUS, OGG, WEBM or CAF file on the page, or click to browse. You can add several at once.
2. Adjust the quality if you like, then click **Convert**. Everything happens on your Mac.
3. Download the MP3. If you want a different result, change the options and run it again on the same file.

The converter can also save to M4A, WAV or FLAC instead of MP3. There is no sign-up and no watermark.

The work is done by a WebAssembly build of FFmpeg running in your browser. The first time, the converter engine (about 30 MB) is downloaded once and then cached. After that, speed depends on your Mac and the length of the recording: a short voice note usually takes seconds.

## Convert a whole folder of voice notes

If you have exported a long chat with dozens of voice messages, select them all in Finder and drag them onto the page together. Batch processing is included, and you can download the converted files together as one ZIP instead of saving them one by one.

## What about built-in Mac apps?

The apps that come with macOS don't offer a simple Opus to MP3 option, which is why most people end up searching for a converter. If you already use the command line, FFmpeg installed through a package manager can do the same job. For everyone else, the browser route is the quickest because there is nothing to set up and it works the same way in Safari, Chrome, Edge or Firefox.

## Other formats and smaller files

[Open Audio Converter](https://filevale.com/audio-converter/)

- **Different output format**: the [Audio Converter](/audio-converter/) also reads Opus files and can save them as MP3, M4A, WAV, FLAC, AIFF, CAF or OGG. AIFF is handy if you plan to edit the clip in an Apple app.
- **An OGG file from a game or player**: use [OGG to MP3](/ogg-to-mp3/).
- **The MP3 is still too big to send**: [Compress Audio](/compress-audio/) makes audio much smaller (64 kbps MP3) for email and messaging.
- **The voice note is inside a video**: pull the sound out with [Video to MP3](/video-to-mp3/). The guide on [extracting audio from a video](/guides/mp4-to-mp3-extract-audio/) walks through it.

You can find every audio and video tool on the [video and audio tools page](/video-audio-tools/).

## Frequently asked questions

### Does converting Opus to MP3 lose quality?

Both Opus and MP3 are lossy formats, so converting can't add back detail the original recording never had. Pick a higher quality setting if you want to keep as much of the original as possible. Your original `.opus` file is left untouched, so you can always convert it again with different quality settings.

### Is it safe to convert private voice messages this way?

Yes. Filevale never uploads your files: the conversion happens inside your browser, on your own Mac. That makes it a good fit for personal recordings, interviews and work calls you wouldn't want to send to someone else's server.

### Can I do the same thing on my iPhone?

Yes. The Opus to MP3 Converter works in any modern browser on iPhone, iPad and Android as well as Mac and Windows. Save the voice note to Files, open the converter in Safari, tap the drop area to pick it, and download the MP3.