MP3 Encoder is an application for converting a variety of audio formats to MP3 using the high quality LAME encoder. It is multi-threaded and will batch convert multiple files at once, up to the number of processor cores your system has. It supports reading and writing metadata, including album artwork, and can create custom output file paths based on the metadata. It can also edit the metadata of existing MP3 files, functioning as a basic MP3 tag editor.

MP3 encoder provides you with a full range of MP3 encoding options. You can select from all of the encoding methods, bitrates, algorithm qualities, and stereo modes offered by the LAME encoder.

Currently Supported Source Formats
3GP Audio
3GPP-2 Audio
Apple Lossless
Core Audio Format
Module Files
Ogg Vorbis
Ogg Flac
Ogg Speex
Real Audio*
Real Media*
Sound Designer II
True Audio
Windows Media Audio*

**Note - DRM Protected files of any kind are not supported.
**Note - Streaming RAM files are not supported.

Looking to create more than just MP3 files? Check out our application Pro Audio Converter. Pro Audio Converter can do everything MP3 Encoder can, plus much more!

What’s New

Version 2.18.1

• Fix an issue when clearing or reverting metadata.

Ratings and Reviews

5.0 out of 5
3 Ratings

3 Ratings

jr32mn5 ,

Worked just fine for me just now

I like the extensive array of options available in this app. It looks like beginners might be a little overwhelmed by the array of options avaiable, but the app also comes set up with very sensible defaults. I have used the LAME encoder for years, but it was always single threaded and it was irritating to know that my CPU wasn't being used to its maximum. I love how this app is multi-threaded and did a great job of running at full speed.

Adam H.. ,

So far, so good

I like this app; it’s does almost exactly what I need it to do.

One thing I think would be handy, though, is the ability to add the item number in the queue to the filename (via Preferences > General > Use A Custom Output File Name Scheme) with a Format Specifier like {QueueNumber}. That way, when dragging a playlist to the queue, the output folder has the tracks are in order (the Metadata usually gets used instead of the filename so that number shouldn’t show up in the title once burned).

Other than that, it’s great.

Key of G ,

Exactly what I was looking for

I do a lot of recording in Propellerheads Reason and needed a quick way to convert my aiff files into mp3 to post to the web or share with friends. I used to use iTunes for the task but it felt cumbersome and I don't always want my demo tracks saved in iTunes. This program is great for dropping multiple tracks for conversion at a time. Conversion is quick, it allows you to tweak the settings, and can do two at a time on a dual core processor. Exactly what I was looking for.


Mark Verstraete
6.7 MB

OS X 10.9 or later, 64-bit processor



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.