Visit the Udyam Registration portal: https://udyamregistration.gov.in/
Click on "Udyami Login" on the top right corner of the homepage.
Enter your 19-digit Udyam Registration Number (UDYAM-XX-00-0000000) and your registered mobile number.
Choose how you want to receive the OTP (One Time Password) and click on "Validate & Generate OTP".
On your dashboard, look for the option to "Print UAM Certificate". Click on that option.
Your Udyog Aadhaar certificate will be displayed on the screen. You can then download and save it as a PDF file.