Complete Tutorial to Convert MKV to MP3 Audio on Windows/Mac/Online

Lisa OuUpdated by Lisa Ou / July 30, 2021 16:30

MP3 is a digital audio format that uses compression algorithm to reduce the overall file size. You can get pretty good audio quality and small file sizes from MP3 audios. Thus, if you want to extract audio from your MKV file, it is recommended to convert MKV to MP3. Because the converted MP3 audio tracks are compatible with most audio players and editors. Here’re the detailed steps to convert MP3 from MKV for offline playback. Both desktop and mobile users can complete the MKV to MP3 conversion here.

Complete Tutorial to Convert MKV to MP3 Audio on Windows/Mac/Online

Guide List

1. What Is MKV File and Why You Need to Convert It

MKV is the file extension of Matroska Multimedia Container. The MKV file holds descriptions, rating, cover art, chapter points and more. Thus, you can see high-definition video files are saved with the MKV file extension. If you want to play MKV files, you can use VLC Media Player app. Thus, you can open MKV files on Windows, Mac, Linux, iPhone and Android. Of course, you can also replace VLC Media Player with other video players that support the MKV format.

As for converting MKV to MP3 format, the main reason is extracting soundtrack from the MKV video. You can decide whether to convert the entire MKV video or the trimmed MKV video clip into MP3. After that, you can play and edit MP3 soundtrack on all compatible platforms.

2. How to Convert MKV File to MP3 on Computer with Video Converter

To convert MKV to MP3 with high quality, it is recommended to use FoneLab Video Converter Ultimate. You can batch convert MKV videos to MP3 with superfast speed and customizable output settings. It is supported to adjust audio encoder sample rate, channels and bitrate before the MKV to MP3 conversion. If you only want to convert the certain part of the soundtrack from your MKV video, you can use the built-in audio trimmer to solve the problem. You can trim and convert any MKV video clip to MP3 in one stop.

  1. Extract MP3 from MKV, AVI, MP4 and other 1000+ media formats.
  2. Trim the soundtrack to extract the part you need.
  3. Support MKV to MP3 batch conversion with 60x faster speed.
  4. Adjust the parameter settings of your video and audio file.
  5. The MKV to MP3 converter software works with Windows 10/8//Vista/XP and Mac OS X 10.6 or above.
  6. You can convert MKV to MP4.
Video Converter Ultimate
Video Converter Ultimate

Video Converter Ultimate is the best video and audio converting software which can convert MPG/MPEG to MP4 with fast speed and high output image/sound quality.

  • Convert any video/audio like MPG, MP4, MOV, AVI, FLV, MP3, etc.
  • Support 1080p/720p HD and 4K UHD video converting.
  • Powerful editing features like Trim, Crop, Rotate, Effects, Enhance, 3D and more.

Step 1Free download, install and launch FoneLab Video Converter Ultimate. Drag and drop MKV files into the video to MP3 converter.

video converter ultimate interface

Step 2Unfold the Profile list. Browse and set MP3 as the output audio format. You can select MP3 from General Audio, Lossless Audio and more. Then click Settings to adjust MP3 audio settings.

video converter ultimate profile settings

Step 3If you want to convert part of MKV video to MP3, you can click Trim on the top toolbar. You can set the custom start and end time to convert MKV to MP3 selectively.

ennter cut interface

Step 4Click Convert to convert MKV files to MP3. Once the MKV to MP3 conversion completes, you can head to the destination folder quickly.

3. How to Convert MKV File to MP3 Online

If you want to convert an MKV file to MP3 on your iPhone or Android, you can use an online MP3 converter as well. Here you can convert MKV to MP3 free online with Convertio. The MKV to MP3 online converter allows users to convert MKV file from the local storage space and cloud. You can extract MKV video files to MP3 online up to 100MB.  

Step 1Open the online MKV to MP3 converter from

Step 2Click Choose Files to import your MKV file.

Step 3Set MP3 as the output format.

Step 4Click Settings to adjust VBR, audio channels, frequency and more.

Step 5Click Convert to convert MKV to MP3 for free online.

convert mkv to mp3 online

By the way, you can also convert MKV to MP4 with it.

4. How to Convert MKV File to MP3 via VLC

VLC is more than a media file player, it is also a powerful tool to help you convert MKV to MP3 with simple clicks.

Step 1Open program on computer, click Media > Convert/Save, then select MKV file.

Step 2Click Convert/Save and choose MP3 from the list and begin converting.

5. Record MP3 from MKV File

The last option you can try to get an MP3 file from MKV video is to record audio from a video. And here, FoneLab Audio Recorder will be highly recommended to you.

Step 1You need to download and install FoneLab Audio Recorder on computer. Both Windows and Mac are supported. Then it will be launched automatically.

FoneLab Screen Recorder
FoneLab Screen Recorder

FoneLab Screen Recorder allows you to capture video, audio, online tutorial, etc on Windows/Mac, and you can easily customize size, edit the video or audio, and more.

  • Record video, audio, webcam and take screenshots on Windows/Mac.
  • Preview data before saving.
  • It is safe and easy to use.

Step 2After that, select Audio Recorder and enable the system sound. Click record icon to begin recording. After it finished, choose MP3 from the output format list and click save icon to store the recorded MP3 file on the computer folder.

mac screen recorder

That’s all to convert MKV to MP3 online and offline. You can extract MP3 audio from MKV video in any file size on your phone or computer. As for mobile users, there is no need to install any MKV to MP3 converter app. You can get the lightweight online MKV to MP3 converters to extract MP3 from MKV for free. If you want to batch convert MKV to MP3 on Windows 10 and Mac, using FoneLab Video Converter Ultimate is the most time-saving choice. You can also get many audio editing and customizable tools here.

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