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The Template Browser is incredibly important to working in the Web module, but frequently overlooked until it's too late. Too often ignorance of the Template Browser leads to a photographer losing hours of design work; for your sake and mine, do not be that photographer!
When creating a new design, always save your work to the Template Browser before quitting Lightroom or switching to another collection, layout style or template.
Once you’ve dialed in your settings for a web engine, those settings may be saved as a template via the Template Browser. Saved templates may then be recalled at a later time for further work, or to be applied to a new set of images.
To create a new template, click the plus icon (+), give the template a name and choose a folder in which to file it.
To update an existing template, right-click the template name — or Ctrl-click it if on a Mac — and select “Update with Current Settings” from the menu:
Templates are bound to a web engine; when a template is selected, the associated web engine will be loaded and your custom settings will be dialed into the controls. Without the associated web engine installed, a template is useless.
Templates may be imported or exported from within the Web module by right-clicking within the Template Browser, or may be installed manually.
With a bit of simple hacking, settings saved in a template may be ported over to another web engine. This is useful for CE3 web engines, as framework elements are intentionally duplicated through out the plugins so that the different components maintain a consistent look and feel. This can save you a lot of time designing your pages and galleries. For more information, see the article on sharing templates between web engines .
For more information on creating custom web templates, see the Adobe Help page for Lightroom 4, Create custom web gallery templates.