We keep Wikimedia projects fast, reliable, and available to all.
From hosting Wikipedia to creating edit-checking artificial intelligence (AI), we design and build the open-source technology that powers Wikimedia projects. Community volunteers and Foundation technologists collaborate on MediaWiki, the platform that makes sharing free knowledge possible.
Hosting the world’s knowledge
Wikipedia is the fifth most-visited website in the world, with more than 6,000 visits every second. Our infrastructure keeps it online. Over the last year, we delivered an uptime of 99.97% (according to independent monitoring) across all project sites.02
Saving data costs for readers
More than half of Wikimedia’s visitors connect from mobile devices. But high mobile data costs across Africa, Latin America, and Asia can make accessing Wikipedia expensive. That is why we redesigned our apps and sites to be up to 51% less data intensive.03
Assisting human collaboration with machine learning
Anyone can edit Wikipedia, and it can be challenging to maintain quality control. That is why we made ORES, an artificial intelligence service that automatically identifies potentially problematic content as soon as it appears, advising editors if changes are needed.
NASA’s internal wiki for collaboration and documentation is built on MediaWiki, just like Wikipedia. We create MediaWiki—open-source wiki software that is free and available for anyone.05
Mentoring new developers
Growing a volunteer developer community
Write code that helps bring free knowledge to everybody.
Want to use your coding skills for good? Our global technical community always welcomes new volunteer contributors of all levels. We offer hundreds of software projects in many different areas.
Uptime delivered across all Wikimedia sites during 2017
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Questions about MediaWiki or the Wikimedia Foundation's technology efforts? Get in touch with our developer community.
NEWS — НОВОСТИ
14 January 2021
Wikipedia celebrates 20 years of free, trusted information for the world
14 January 2021 — Wikipedia, the world’s largest free online encyclopedia, turns 20 years old on 15 January. This birthday commemorates two decades of global efforts to support free knowledge, open collaboration, and trust on the internet. In a time when disinformation and polarization challenge our trust in information and institutions, Wikipedia is more relevant….
7 December 2020
Supporting Wikipedia and the environment: The Wikimedia Foundation and Plant Your Change collaborate to plant 400,000 trees
Update: Thanks to the generosity of Wikipedia donors, we were able to meet our goal of planting 400,000 trees! If you have not yet given to Wikipedia and are able to, we are grateful for your support. Visit donate.wikimedia.org to make a contribution. Timed with our 2020 end-of-year fundraising campaign on English Wikipedia, the Wikimedia….
ELSEWHERE IN WIKIMEDIA — AILLEURS DANS WIKIMÉDIA
Dive deeper into Wikimedia projects
Originally created for use on Wikipedia, MediaWiki is free and open-source wiki software written in PHP.
The web service and API that provides machine learning as a service to flag bad edits and vandalism on Wikimedia projects.
Wikipedia at your fingertips on Android. Set your app to night reading mode or save articles to read offline.
Wikipedia at your fingertips on iOS. Set your app to night reading mode or save articles to read offline.
Our API provides straightforward access to Wikimedia content and data, in machine-readable formats.
Wikistats is a public dashboard featuring data about the reach and impact of Wikimedia projects.
Help us unlock the world’s knowledge.
As a nonprofit, Wikipedia and our related free knowledge projects are powered primarily through donations.
The Wikimedia Foundation, Inc is a nonprofit charitable organization dedicated to encouraging the growth, development and distribution of free, multilingual content, and to providing the full content of these wiki-based projects to the public free of charge.