Below Steps will help you Quickly Identify Site Template Id which is used in SharePoint site with out using PowerShell or SharePoint object model code:
– Browse to the site
– Right Click on the page -> View Source
– Search for g_wsaSiteTemplateId
– You will see like below
g_wsaSiteTemplateId = ‘SPS#0’;
It will show as per site template used on site.
Here the site template is SPS#0.
And g_wsaSiteTemplateId is the variable name that contains the site template id. Hope this will be helpful