viewer; reader; visitor (of a website)
Refers to someone who views or reads content, especially on websites, documents, or digital platforms. More formal than 読者 (reader of books).
The number of visitors to this site is increasing every month.
You can set restrictions on who can view the document.
視聴者 refers to viewers of TV or video content. 閲覧者 is used for text-based or web content.
Compound of 閲覧 (browsing, reading) + 者 (person). The word is a straightforward Sino-Japanese formation.