Wikimedia Foundation

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

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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.


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

More about research


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

More about technology


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

More about advocacy

NEWS —  

See what we have been up to

How impactful are our grants? We’re investigating.

14 August 2018

For almost a decade, the Wikimedia Foundation’s Community Resources team has been funding people and organizations pursuing our vision: Imagine a world in which every single human being can freely share in the sum of all knowledge. In the last five years alone, we’ve given out over 35 million US dollars across almost 80 countries. Our efforts….

Wikimedia to Senate: Don’t weaken the public domain

9 August 2018

In an attempt to harmonize copyrights for the use of sound recordings created before 1972, the U.S. Senate is currently poised to pass a bill which could endanger the preservation and sharing of historical sound recordings online. The Music Modernization Act (MMA), which was passed in the House of Representatives in April and recently received….

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


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.


Wikimedians are heroes of free knowledge.

Felix Nartey
Editor since 2012, Wikimedia community
May Hachem
Editor since 2013, Wikimedia community
Pranayraj Vangari
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


editors contribute to the Wikimedia projects every month

47+ million

media files on Wikimedia Commons

1+ billion

unique devices access Wikimedia projects every month


Things to know

Wikimedia projects belong to everyone

You made it. It is yours to use. All text on Wikimedia sites is available as Creative Commons material. That means you can use it, re-write it, or share it. Just do not write your own bio, or copy/paste it in your homework.

Your data belongs to you

We do not sell your email address or any of your personal information with third parties. More information about our privacy practices are available at the Wikimedia Foundation privacy policy, donor privacy policy, and requests for user information procedures and guidelines.

People like you keep Wikipedia accurate

Wikipedia articles are collaboratively created and edited by a community of volunteers using reliable sources. Readers verify the facts. No single person or company owns a Wikipedia article. We cannot change a Wikipedia article about you, 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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Contact a human

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



Photo credits


AWang (WMF)

CC-BY-SA 4.0

Wikimedia Conference 2017

Jason Krüger/Wikimedia Deutschland e.V.

CC BY-SA 4.0


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


Public domain

Wikimedia Commons logo - white

Reidab; User:Grunt; 3247

Public domain

Felix Nartey

Ruby Mizrahi

CC SA 3.0

May Mohamed Hisham Hashem

Ruby Mizrahi

CC BY-SA 3.0

Pranayraj Vangari

Pranayraj Vangari

CC BY-SA 4.0

Lighting through the ages

Maurice Dessertenne

Public domain

Art+Feminism Wikipedia edit-a-thon

Jens Mohr

CC BY-SA 3.0