# Kotobank (コトバンク)

> Japan's free online dictionary and encyclopedia aggregating multiple reference publishers

Market: Japan
Main language: ja
Traffic rank (Tranco): #29,229
Kind of site: reference
Topics: Education
Last updated: 2026-09-18

## Best for
- awareness (medium): Japanese readers look up word meanings across dictionaries and encyclopedias, a broad everyday audience.
- awareness · education (medium): A reference site people use to learn terms, which suits education and learning services in Japan.

## About
Kotobank is a free Japanese web encyclopedia that searches dictionaries, encyclopedias and databases from publishers at once, run by Business Architect Inc.

Kotobank is a free web encyclopedia in Japanese that lets a search run across dictionaries, encyclopedias and databases supplied by publishers at the same time. It is operated by Business Architect Inc. and collects content with clear sourcing, with an emphasis on reliability of the entries it aggregates.

The site lists a keyword of the day, update notices for reference works such as the Britannica International Encyclopaedia (concise edition), the Chemistry Dictionary Second Edition, Nippon Encyclopedia (Nipponica) and Digital Daijisen Plus, a full list of dictionaries, and an access ranking page, alongside a paid plan that removes ads from the site.

## Links

Full listing: https://adspotfinder.com/kotobank
Website: https://kotobank.jp
About this data: https://adspotfinder.com/llms.txt