BASE (search engine)

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BASE (Bielefeld Academic Search Engine)
Type of site
Academic Internet search engine
Available inChinese (simplified), German, English, French, Spanish (Castilian), Polish, Greek, Ukrainian
Area servedWorldwide
OwnerBielefeld University Library
LaunchedJune 24, 2004; 19 years ago (2004-06-24)
Current statusActive

BASE (Bielefeld Academic Search Engine) is a multi-disciplinary search engine to scholarly internet resources, created by Bielefeld University Library in Bielefeld, Germany. It is based on free and open-source software such as Apache Solr and VuFind.[1] It harvests OAI metadata from institutional repositories and other academic digital libraries that implement the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH), and then normalizes and indexes the data for searching. In addition to OAI metadata, the library indexes selected web sites and local data collections, all of which can be searched via a single search interface.


Users can search bibliographic metadata including abstracts, if available. However, BASE does not currently offer full text search. It contrasts with commercial search engines in multiple ways, including in the types and kinds of resources it searches and the information it offers about the results it finds. Results can be narrowed down using drill down menus (faceted search). Bibliographic data is provided in several formats, and the results may be sorted by multiple fields, such as by author or year of publication.

Paying customers include EBSCO Information Services who integrated BASE into their EBSCO Discovery Service (EDS).[2] Non-commercial services can integrate BASE search for free using an API. BASE becomes an increasingly important component of open access initiatives concerned with enhancing the visibility of their digital archive collections.[3]

On 6 October 2016, BASE surpassed the 100 million documents threshold having indexed 100,183,705 documents from 4,695 content sources. As of 2022, it had indexed over 280 million documents from over 9000 sources.[4]

See also


  1. ^ Pieper, Dirk (May 18, 2011). "BASE Migration". InetBib. Retrieved August 27, 2013.
  2. ^ Price, Gary (December 7, 2015). "Content from Bielefeld University's BASE Database Now Searchable in EBSCO Discovery Service". Library Journal INFOdocket. Retrieved July 10, 2017.
  3. ^ Lochman, Martin (March 23, 2017). "Open Archives Initiative service providers: Enhancing the visibility of research in Malta". Retrieved April 13, 2017.
  4. ^ "BASE - Bielefeld Academic Search Engine | Statistics".


  • Lossau, Norbert. 2004. "Search Engine Technology and Digital Libraries: Libraries Need to Discover the Academic Internet," D-Lib Magazine, Volume 10, Number 6, June 2004. doi:10.1045/june2004-lossau
  • Summann, Friedrich and Norbert Lossau. 2004. "Search Engine Technology and Digital Libraries: Moving from Theory to Practice," D-Lib Magazine, Volume 10, Number 9, September 2004. doi:10.1045/september2004-lossau

External links