17.7
Wikipedia is a free encyclopedia available through web and mobile platforms, with editions in hundreds of languages, including languages with more…
Free planOpen sourceAndroidiOSWeb
Best Online Encyclopedias in 2026
Online encyclopedias provide reference material for exploring subjects, checking facts or supporting learning. Compare content formats and update frequency to understand how information is presented and maintained. Citation tools can matter when you need to trace sources, while educator resources and institutional access are worth considering for study or teaching contexts. Wikipedia, Store norske leksikon and…
27.4
Free planAndroidiOSWeb
37.2
Encyclopaedia Universalis is a subscription encyclopedia for individual readers and organizations using reference material for learning and documentary research.
AndroidiOSWeb
- 4
Encyclopedia.com
Encyclopedia.com is a free web reference service with more than 300,000 entries from published sources including Oxford University Press and the Columbia Encyclopedia.
Free planWeb6.6Free plan - 5
Enciclopèdia.cat
Enciclopèdia.cat is a free Catalan-language reference portal for looking up subjects such as language, history, economics, art, politics, geography, science, and nature.
Free planWeb6.5Free plan - 6
Encyclopedia of Arkansas
Encyclopedia of Arkansas is a free web reference for the state’s history and culture, intended for historians, educators, students and other readers.
Free planWeb6.4Free plan - 7
Encyclopedia Virginia
Encyclopedia Virginia is a free web resource about Virginia’s history and culture, with topical and biographical entries written by scholars for a general audience.
Free planWeb6.4Free plan - 8
Lex – Danmarks Nationalleksikon
Lex – Danmarks Nationalleksikon is Denmark’s free, searchable national encyclopedia, with Danish-language reference content written by researchers and other professionals.
Free planWeb6.4Free plan - 9
World Book Online
World Book Online is a digital reference service for learners from early childhood through high school, with resources also intended for classrooms and libraries.
AndroidiOSWeb6.4From $250 a year - 10
Brockhaus
Web6.3From €69.99 a year - 11
6.3From 590 SEK a year - 12
Store norske leksikon
Store norske leksikon (SNL) is a free reference work with expert-written articles based on research.
Free planiOSWebAPI6.3Free plan - 13
Treccani
AndroidiOSWeb6.3 - 14
Baidu Baike
Baidu Baike is a free, web-based Chinese knowledge platform for looking up information across many fields.
Free planWeb6.2Free plan - 15
Encyclopedia of Alabama
Encyclopedia of Alabama is a free web reference resource covering Alabama history, culture, geography, and the natural environment.
Free planWeb6.0Free plan - 16
Encyclopedia of Korean Culture
Encyclopedia of Korean Culture is a free online reference covering Korean history, culture, thought, arts, regions, and daily life.
Free planWebAPI6.0Free plan - 17
Klexikon
Klexikon is a free German-language online encyclopedia written for children roughly 6 to 14 years old.
Free planWeb6.0Free plan - 18
The Canadian Encyclopedia
The Canadian Encyclopedia is a free web resource focused on Canada’s history and culture.
Free planWeb6.0Free plan - 19
Wikiquote
Wikiquote is a free, collaborative quotation reference site run by the nonprofit Wikimedia Foundation.
Free planWeb6.0Free plan - 20
Encyclopédie Larousse
Encyclopédie Larousse is a free online encyclopedia with a homepage search field for finding entries.
Free planWeb5.9Free plan - 21
New World Encyclopedia
New World Encyclopedia is a free online reference containing thousands of selected articles across humanities, sciences, and the arts.
Free planWeb5.9Free plan - 22
Vikidia
Vikidia is a collaborative online encyclopedia primarily for readers and contributors aged 8–13.
Free planWeb5.9Free plan - 23
Te Ara – The Encyclopedia of New Zealand
Te Ara – The Encyclopedia of New Zealand is a free web reference covering all aspects of New Zealand life.
Web5.7 - 245.6
- 25
Infoplease
Infoplease is a free web reference and learning site that brings together an encyclopedia, dictionary, thesaurus, atlas, and almanacs.
Web5.6