WhatsApp can do more than send messages and photos. A hidden tool inside the app turns stacks of paper into tidy digital files in just a few taps.

You have the option to convert Google Docs into PDFs and either save them to your computer or send them as an email ...

You can save a PowerPoint presentation as a PDF to lock its content and formatting in place, so that other people can view ...

In 1983, architect Peter Calthorpe gave up on San Francisco, where he had tried and failed to organise neighbourhood communities, and moved to a houseboat in Sausalito, a town on the San Francisco Bay ...