JPort enables you to generate SAR files on the fly. If your JMeter script has extractors, JPort will create SAR file for auto correlation. 

We recommend you to sign up for a Pro account to make use of all the premium features. 

  1. Launch JPort
  2. Upload your JMeter test plan
  3. Click on Export button

You will be prompted to download the SAR file as shown below, hit OK to download.