Abstract. This paper presents GoNTogle, a tool which provides ad- vanced document annotation and search facilities. GoNTogle allows users to annotate several document formats, using ontology concepts. It also produces automatic annotation suggestions based on textual similarity and previous doc- ument annotations. Finally, GoNTogle combines keyword and ontology-based search, offering advanced ontology query facilities. keyword-based search, including ontology-based search with advanced semantic queries and combined search. In con- strast with other works, our aim was to implement an easy- to-use document annotation and search tool, that would fully support viewing and annotating popular document types maintaining their initial format, sharing those annotations and searching for documents combining keyword and ontol- ogy search.