Definition · Plain-language
VOSviewer
VOSviewer is a free software tool designed for constructing and visualising bibliometric networks, allowing researchers to map co-citations, co-authorships and keyword co-occurrences.
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Network construction and data sources
VOSviewer imports publication data directly from major scholarly databases like Web of Science, Scopus, Dimensions and PubMed. It can also process files from reference managers like EndNote and Zotero. The software processes these datasets to build networks based on co-authorship, co-citation, bibliographic coupling or keyword co-occurrence, converting raw metadata into structured matrices that describe scientific relationships. This capability allows researchers to easily ingest large volumes of bibliographic data without manual formatting. By connecting directly to public APIs, the software streamlines the data acquisition process, enabling scholars to construct comprehensive maps of their field’s literature resources. This automation saves significant time, allowing bibliometricians to focus their efforts on interpreting the resulting network structures.
Visualisation techniques and layouts
The software uses unique layout and clustering algorithms to position items in a network, placing closely related items near each other. Users explore networks through three visualisations: network visualisation, overlay visualisation (which displays temporal changes, such as publication years), and density visualisation. These customisable visual maps help researchers identify central themes, citation concentrations and gaps in literature. The density view is particularly helpful for identifying hot topics that receive intense research focus, while the overlay view highlights how themes have shifted over time, helping researchers spot rising trends within their specific fields clearly. This visual flexibility allows users to present high-dimensional bibliographic data in a format that is easily understandable for non-specialist audiences.
Applications in research synthesis
VOSviewer is widely used by researchers conducting systematic literature reviews and meta-analyses. By generating keyword maps, researchers categorise thematic developments and trace how key terms have changed over time. It is also used by university libraries and research administrators to evaluate institutional collaboration patterns and visually present research strengths to funding panels. These visual portfolios make it easier to communicate complex citation data to non-specialist stakeholders, demonstrating the institutional reach and impact of research programmes in a compelling format, which supports grant proposals, institutional reports, and collaborations. This dual utility for both individual scholars and high-level administrators makes the software a versatile tool in the modern research ecosystem.
Key facts
At a glance
- Free software tool developed at Leiden University for bibliometric mapping
- Constructs co-authorship, co-citation, bibliographic coupling and keyword networks
- Imports metadata directly from Scopus, Web of Science, PubMed and RIS files
- Offers three visual representation formats: network, overlay and density plots
- Uses specialised algorithms to cluster and layout related nodes in close proximity
- Assists in systematic reviews by identifying thematic trends and literature gaps
Common misconceptions
What people often get wrong
Often heard: VOSviewer is a search engine that directly indexes new academic articles.
Actually: It is a visualisation tool that requires you to import metadata files exported from external citation databases first.
Often heard: Any items clustered close together on a VOSviewer map are identical in research content.
Actually: Proximity indicates bibliographic relationship strength (e.g. shared citations or keywords), not that the papers have identical findings.
Common questions
FAQ
What databases are compatible with VOSviewer?+
VOSviewer natively supports exports from Web of Science, Scopus, Dimensions, Lens.org and PubMed. It also processes generic API data and reference manager files in RIS or BibTeX formats.
Is VOSviewer free for commercial or institutional use?+
Yes, VOSviewer is free software. It is distributed under a standard licence that allows researchers, institutions and businesses to use it for data analysis and reporting.
Going deeper
