Article · Wikipedia archive · Last revised Jun 8, 2026

Weblio

Weblio is a free integrated bilingual dictionary website and online encyclopedia for Japanese-speaking sites operated by the GRAS Group, Inc. (GRASグループ株式会社), formerly known as the Weblio Corporation (ウェブリオ株式会社). Weblio can perform a bulk search on a variety of dictionaries, encyclopedias and glossaries, and return results. The dictionary facility includes Kenkyūsha's New Japanese-English Dictionary and 70 other Japanese–English and English–Japanese dictionaries with 4,160,000 English words and 4,730,000 Japanese words. As of January 20, 2016, a total of 665 dictionaries, encyclopedias and glossary sites can be searched in full.

Last revised
Jun 8, 2026
Read time
≈ 1 min
Length
252 w
Citations
8
Source
Wikipedia ↗
Weblio
Lowercase text logo of Weblio with W made blue and the remaining letters black
Type of site
Online dictionary
Available inJapanese
Country of originJapan
OwnerGRAS Group, Inc.
URLweblio.jp
CommercialYes
LaunchedJanuary 25, 2006 (2006-01-25)
Current statusActive

Weblio is a free integrated bilingual dictionary website and online encyclopedia for Japanese-speaking sites operated by the GRAS Group, Inc. (GRASグループ株式会社), formerly known as the Weblio Corporation (ウェブリオ株式会社).123 Weblio can perform a bulk search on a variety of dictionaries, encyclopedias and glossaries, and return results. The dictionary facility includes Kenkyūsha's New Japanese-English Dictionary and 70 other Japanese–English and English–Japanese dictionaries with 4,160,000 English words and 4,730,000 Japanese words.45 As of January 20, 2016, a total of 665 dictionaries, encyclopedias and glossary sites can be searched in full.6

History

Beta testing began on December 12, 2005,7 and the site began to formally provide services searching 11 different dictionaries and encyclopedias on January 25, the following year.8

References

References

  1. Japanese Language: Reference: Encyclopedias, University of Washington Libraries
  2. 日経クロステック（xTECH） (2007-03-26). "月間1000万ビュー近くのアクセスを自社内の40～50台の中古パソコンでさばくWeblioのシステム | 日経クロステック（xTECH）". xtech.nikkei.com (in Japanese). Retrieved 2025-12-07.
  3. "国内の総合辞書検索屋への挑戦者、ウェブリオとは？". ＠IT (in Japanese). Retrieved 2025-12-07.
  4. Japanese e-resources: Dictionaries, Stanford University libraries
  5. Cao, Longbing; Motoda, Hiroshi; Srivastava, Jaideep; Lim, Ee-peng; King, Irwin; Yu, Philip S.; Nejdl, Wolfgang; Xu, Guandong; Li, Gang (2013-12-13). Behavior and Social Computing: International Workshop on Behavior and Social Informatics, BSI 2013, Gold Coast, Australia, April 14-17, and International Workshop on Behavior and Social Informatics and Computing, BSIC 2013, Beijing, China, August 3-9, 2013, Revised Selected Papers. Springer. ISBN 978-3-319-04048-6.
  6. "Weblio homepage". Retrieved 2016-01-20.
  7. "プレスリリース オンライン百科事典「Weblio:ウェブリオ」のベータ版をオープン" [Weblio opens beta version] (press release). Weblio. 2005-12-12. Retrieved 2008-01-28.
  8. "プレスリリース オンライン百科事典「Weblio:ウェブリオ」を正式オープン" [Weblio officially open] (press release). Weblio. 2006-01-25. Retrieved 2008-01-28.
External links