What file format did WhatsApp’s 2016 document-sharing feature initially allow? It initially allowed PDF files. When WhatsApp introduced document sharing in March 2016, PDFs were the first supported document type.
The feature expanded WhatsApp beyond text, photos, videos, audio, and location sharing. Users could send a PDF directly inside a chat, and recipients could open or download it without relying on a separate email attachment or file-transfer service.
At launch, WhatsApp displayed useful information about a shared PDF, including its file type, file size, page count, and a preview. The initial limitation was deliberate: the service did not yet support every common office or archive format.
A frequent mix-up is to remember the later, broader document-sharing capability rather than the launch restriction. Over time, WhatsApp added support for formats such as DOC, DOCX, PPT, XLS, TXT, ZIP, and others. The historical answer for the 2016 launch, however, is PDF.