Maztr's free online Audio Stem Separator is a quick and easy tool you can use right in your browser, without downloading any software, to isolate the vocals and instrumental streams or other elements such as drums, bass and piano, from your mp3, .wav, .aac, .aiff, .flac and .wma audio files. No account or login is required to use it.

Audio separation is also known as a vocal remover, karaoke maker (instrumental only) or acapella maker (voice only). In its simplest form, you can use audio stem separation to split a track into separate vocals and accompaniment, or alternatively, dial up the separation to 4 or 5 stems.

The process is highly CPU intensive, so processing can take a few minutes per track. The results mostly depend on the quality of the source audio files you upload, and some audio files and formats simply separate better than others.

We have many more free tools for your audio files. Click here to check them out.

How do I use the Audio Stem Separator?

1. In the "Select Audio File" section above, drag and drop or click to select the file from your local device.
2. If you want to change your selected audio file, hover or click the file then click "Remove".
3. Choose your Stem Separation settings. You can select the number of stems, frequency limit and output file format.
4. The Stem Separation setting has the following options:
   
   • 2 stems separates vocals and instrumental.
   • 4 stems separates vocals, bass, drums and everything else.
   • 5 stems separates vocals, bass, drums, piano and everything else.
5. The default Frequency Limit setting limits frequencies to 11kHz giving best results for most tracks. You can also try the 16kHz setting which may give a better sound for some tracks, however more artefacts or imperfections may occur at this level.
6. Click the "Upload" button to submit your file for processing.
7. Finally, click the "Download" button to download a zip file containing your separated files.

What is Audio Stem Separation?

Stem Separation splits the final mix of an audio track into its discrete audio elements, such as vocals, drums, bass and piano. The resulting stem tracks, also known as split tracks or simply stems, will typically be stereo audio files containing the isolated components of each particular element. Each stem track will have the identical length, starting point and audio file type of the original mix track.

Why do I need Audio Stems?

Audio stems can help you create karaoke tracks, isolate an instrument for music practise or tuition, collaborate with other artists, create music remixes or generally boost your musical creativity. Stems allow you to repurpose elements from one track to use in another. You can easily boost the tempo, loop a melody or replace an element with something new to create a unique sound.

What is the Karaoke effect?

Some people call the process of removing vocals the Karaoke effect, which allows the resulting instrumental track to be used for Karaoke purposes.

Is the Stem Separation process perfect?

Sometimes no. Occasionally, artifacts or audio crossover can be heard on some tracks, however you may be able to clean up some imperfections by mastering the separated output files through your Maztr account or using our Audio File Cleaner if you don't have an account.

Further Reading

If you need more information about Audio Stem Separation, click here to read our Blog article on the subject.

Does the Audio Stem Separator have any usage limits?

Yes, the following limits apply based on your Maztr Subscription:

• No account is required to use this tool. Without an account, you have a limit of one 5MB file upload per day and can download the output as MP3 files up to 192kbps, split into 2 stems. Free and Single Accounts have these same limits.
• MP3 Accounts can upload unlimited 50MB files and can download the output as MP3 files up to 320kbps, split up to 5 stems.
• Pro or Plus Accounts can upload unlimited 100MB files and can download the output as WAV files or 320kbps MP3 files, split up to 5 stems.
• Upgrade here if you want to increase your limits.

Do you have an MP3 or Pro/Plus Account?

If you do and you're seeing this message, it means you're not logged into your account. Please log in here before using the Audio Stem Separator and make sure you have cookies enabled in your browser. If your browser clears the cookies, you’ll need to log in again.