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Wikimedia Foundation

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Imagine a world in which every single human being can freely share in the sum of all knowledge.

Wikimedia Foundation Wikimedia Foundation Donate Now

Stell dir eine Welt vor, in der jeder einzelne Mensch frei an der Summe allen Wissens teilhaben kann.

The non-profit Wikimedia Foundation provides the essential infrastructure for free knowledge. We host Wikipedia, the free online encyclopedia, created and edited by volunteers around the world, as well as many other vital community projects. We welcome anyone who shares our vision to join us in collecting and sharing knowledge that fully represents human diversity.

Research

We conduct our own research and partner with researchers worldwide to address change in society and technology.

More about research

Technology

From site reliability to machine learning, our open-source technology makes Wikipedia faster, more reliable, and more accessible worldwide.

More about technology

Advocacy

We fight to protect everyone’s right to access free and open knowledge.

More about advocacy

NEWS —  

See what we have been up to

Wikimedia Foundation joins the Global Network Initiative

29 October 2018

The Wikimedia Foundation is honored to join the Global Network Initiative (GNI) as an observer, an opportunity we hope will advance our efforts to champion freedom of expression and privacy for the Wikimedia community and beyond. GNI is a channel for collective action, advocating to governments and international institutions for policies and laws which promote….

Women in Red is changing Wikipedia’s coverage of women, one article at a time

18 October 2018

The news that optical physicist Donna Strickland did not have a Wikipedia page before winning the Nobel Prize in Physics brought renewed attention to Women in Red, a long-standing volunteer effort to add more biographies about women to the encyclopedia. After the announcement, the Women in Red WikiProject had one of their best weeks ever,….

Projects —

Collaborative projects are the core of the Wikimedia movement.

Our volunteers build tools, share photos, write articles, and are working to connect all the knowledge that exists.

See all projects

Wikipedia

Free encyclopedia written in 300 languages by volunteers around the world.

Wikimedia Commons

The world's largest free-to-use library of illustrations, photos, drawings, videos and music.

PARTICIPATE —

Wikimedians are heroes of free knowledge.

Emily Temple-Wood
Editor since 2007, Wikimedia community
Vitor Mazuco
Editor since April 2009, Wikimedia community
Arminé Aghayan
Editor since 2013, Wikimedia community

Throughout history, knowledge has been controlled by a powerful few. Wikipedia needs knowledge from all languages and cultures. The internet has become the default for accessing information—women, people of color, and the global south remain underrepresented. We invite you to help correct history.

Join the movement

200,000+

editors contribute to Wikimedia projects every month

47+ million

media files on Wikimedia Commons

1+ billion

unique devices access Wikimedia projects every month

KEY INFORMATION —

Things to know

Wikimedia projects belong to everyone

You made it. It is yours to use. For free. That means you can use it, adapt it, or share what you find on Wikimedia sites. Just do not write your own bio, or copy/paste it into your homework.

We respect your data

We do not sell your email address or any of your personal information to third parties. More information about our privacy practices are available at the Wikimedia Foundation privacy policy, donor privacy policy, and data retention guidelines.

People like you keep Wikipedia accurate

Readers verify the facts. Articles are collaboratively created and edited by a community of volunteers using reliable sources, so no single person or company owns a Wikipedia article. The Wikimedia Foundation does not write or edit, but others can help.

Not all wikis are Wikimedia

The word “wiki” refers to a website built using collaborative editing software. Hundreds of organizations and projects with no affiliation with Wikipedia or the Wikimedia Foundation also use the term, including wikiHow and WikiEducator.

Wikimedia has nothing to do with Wikileaks and never did. Although both use the term “wiki” in their name, they have always been completely separate and unaffiliated.

Help us unlock the world’s knowledge.

As a nonprofit, Wikipedia and our related free knowledge projects are powered primarily through donations.

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Connect —

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Contact a human

Questions about the Wikimedia Foundation or our projects? Get in touch with our team.

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Photo credits

CEEMeeting2016_Armenia_Globe_26

AWang (WMF)

CC-BY-SA 4.0

Wikimedia Conference 2017

Jason Krüger/Wikimedia Deutschland e.V.

CC BY-SA 4.0

Papaul_Tshibamba-3

Victor Grigas

CC BY SA 3.0

SOPA protest in Midtown NYC

Zachary McCune

CC BY-SA 4.0

A history of all nations from the earliest times

Internet Archive Book Images

Public domain

Wikipedia logo

Nohat; Paullusmagnus; Wikimedia

CC-BY-SA 3.0

Optic Projection fig 89

McAllister

Public domain

Wikimedia Commons logo - white

Reidab; User:Grunt; 3247

Public domain

Emily Temple-Wood at Wikimania 2014

Victor Grigas/Wikimedia Foundation

CC BY-SA 3.0

Vitor Mazuco

Matthew (WMF)

CC BY-SA 3.0

Armine Aghayan

Victor Grigas

CC BY-SA 3.0

Lighting through the ages

Maurice Dessertenne

Public domain

Art+Feminism Wikipedia edit-a-thon

Jens Mohr

CC BY-SA 3.0