How do we Convert an HTML file into a master page in SharePoint 2013

Step 1: Create and save the HTML file.

Step 2: Now Open SharePoint Site and navigate to Site Settings >  Look and Feel > Design Manager > Select  "Edit Master Pages".

  

Step 3: Now click "Convert an HTML file to a SharePoint master page".

Step 4: Now add the HTML File.

Step 5: HTML File uploaded successfully.

Step 6: Select an HTML file to Insert into Master Page library.

Step 7: Master Page is Ready to Apply.

Next Click Here to create Page Layouts