F.A.Q
Our test system might store incorrect HTML title for some test results. One example is this URL(https://zh.greatfire.org/cn.nytimes.com/article/china/2012/07/31/c31qidong) on Aug 2nd. We have fully solved this problem by mm,dd,2012 Any URL in China was inaccessible in U.S testing node because server's IP was blocked by the GFW and the block works both ways. One example is this URL(https://en.greatfire.org/cn.yahoo.com) from April 5 to Aug 20. We... more
We're a non-profit organization and are exploring ways to make the project a financially sustaining entity.
Yes! Check our list of keywords blocked on Weibo and test any keyword here.
Again, the processes which we use can easily be applied to online censorship in other countries (including the US). At the moment however, we are focusing our efforts on China.
Use images and codewords to get around keywords blocked on Chinese websites
Thousands of keywords are blocked on Baidu, Sina Weibo etc. You can make life much more difficult for the censors by posting images of blocked keywords as well as finding other ways of describing the same thing. [To do: examples].
Use HTTPS to circumvent keywords blocked on foreign websites
If you use https://www.google.com.hk instead of http://www.google.com.hk, the Great Firewall... more
We have received a lot of good will from many visitors since our launch. Please feel free to contact us if there are any ideas you would like to share. Simply following us on Twitter and sharing our content with your networks is helpful for us. If you are the operator of a web site, please consider using our widget on your own web site.
We write blog posts about trends which we see in our data and are trying to build our profile via social media. If there are stories you would... more
There is no other real-time, up-to-date resource on what sites and searches are blocked in China. Our aim is to be the leading destination for information of this kind and our goal is to bring transparency to online censorship in China.
The Great Firewall of China resets connections of web requests that contain certain censored keywords. The screenshot above shows an example of a Google search which resulted in the connection being reset. Once a censored keyword has generated a connection reset state, it often blocks any traffic to the given website for a period of time. 
DNS means Domain Name System. It's the global system which converts domain names (eg domain.com) into IP addresses (eg 1.2.3.4). DNS Poisoning refers to the intentional manipulation of this system such that a domain name does not resolve to a correct IP address. When in place, the website will be unavailable or redirect to a different website.
There are legitimate reasons why a DNS lookup may return different IPs depending on the country where the request comes from. For this reason, one can... more 
The most famous example of this form of censorship is Skype. Whenever skype.com is accessed from China, it redirects to skype.tom.com. Tom.com is Skype's local partner in China. The product offered by Tom is visually very similar to the original Skype and the user is not informed of the redirection. However, Tom Skype is subject to Chinese regulations meaning that all personal data, calls and chats are filtered, centrally stored and open to government surveillance.
Our system concludes that a website... more 
All websites hosted in China are required to exercise self-censorship. This takes many forms and is more complex to track than censorship of foreign websites. Some websites admit to self-censorship by displaying a certain message when searching for certain keywords. One example is Baidu, as shown above, which presents the following message for particularly sensitive searches:根据相关法律法规和政策，部分搜索结果未予显示。This roughly translates to:In accordance with relevant... more 
This form of censorship means that the web request is manipulated by the Great Firewall of China such that it loads indefinitely without a response. The browser gives up after a period of time and displays a message such as "The connection has timed out". Without access to circumvention tools, it's not possible to distinguish between this form of censorship and server problems. As a result, many users may interpret the message as a technical problem caused by the website itself.
Our system... more We collect data about the Great Firewall of China and share real-time and historical information about blocked web sites and searches, with a particular focus on Google and Baidu.
We started collecting data about the Great Firewall of China in February, 2011, and launched a web site making this information public under the name GreatFirewall.biz. We changed our name to GreatFire.org in October, 2011. We have continued to add information about blocked searches and web sites and are constantly trying to improve our data. Initially we only covered a few hundred web sites but now we monitor over 10,000 urls.
Our data comes from the following sources:
1. User additions. Anyone can add a new URL for testing and it will be continuously tested by our system.
2. Collaboration with other projects. Any URL that's marked as blocked in China by these sources is automatically imported into our system: Autoproxy, China Digital Times and Herdict. Each keyword in our system - be it on on Baidu, Google, Weibo or Wikipedia - corresponds to a URL on that website which is tested for censorship similarly to how any other URL is tested. These keywords are mainly added by users. China... more
Due to the sensitive nature of the content on our web sites we prefer to remain anonymous at this point. You can, however, contact us on info at greatfire dot org or via @GreatFireChina on Twitter.
- Bringing Transparency To The Great Firewall Of China
Comments
Hi Sir/Miss, I just did url test in your website and found that our website (www.wes.sg) is 100% blocked in China. Can i know why it has blocked and what should we do to make it unblock? Thanks a lot.
Facking china democracy
Your test says that pinterest is not blocked, but it's redirecting to a Chinese search engine (either www.sogou.cn or o66.cn). Only been for the last 12 hours or so. And the captcha's not working on images...
what is the difference between blocked and restricted?
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I am currently posting your and theFreeWeibo.org name on Weibo, will anyone in China be able to read it?
I wonder for what government this website is acting? Censorship in China is a particular object of maintaining stability and in order to develop its economic growth because of its historical and cultural features. it is indeed a developing country (so everything could not be perfect and can be perfect right now) with a very diverse cultural, religious and ethnic diversity (a billion and a half people!), but also because of its recent communist chapter. All countries in the world seeks to cultivate patriotism and stability in order to enrich and avoid the risk of civil war - can lead to an internal implosion and human massacres. Is this is what you want for China? and why do not you monitor the U.S.?
To alean:
Do you seriously believe the combination of censorship and one-party rule is the formula for stability longer term? I feel sorry for all Chinese for not having the freedom to speak our mind and having to accept lying as part of everyday life. Is this kind of "stable" life the best Chinese people can hope for?
Do you have open API or any other way I can use to download the uncensored data for research purpose?
Greatly appreciate what you did! really a good job!
Do you have open API or any other way I can use to download the uncensored data for research purpose?
Greatly appreciate what you did! really a good job!
当然,我是翻墙来这里的.
希望这个网站能从技术上推动民主
当然,我是翻墙来这里的.
希望这个网站能从技术上推动民主
当然,我是翻墙来这里的.
希望这个网站能从技术上推动民主
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Hi there.
I've just found my website www.amuletbhutan.com is 100% blocked. Is there any functionality on this site to that may be able to explain a reason for this?
HI! i performed the test on a web i created and i got a 50% blocked result. In the details i got the following data: "28 (CURLE_OPERATION_TIMEDOUT)".
What does it mean? Can i fix that?
Could you please tell me more about this? the url is http;//www.raulpardeilhan.com
Thank u very much!
my e-mail: nmartorelli@gmail.com
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我们都热爱我们的祖国，但是我们反对互联网审查和对于隐私的窃取。
我们都热爱我们的祖国，但是我们反对互联网审查和对于隐私的窃取。
请问下，目前在大陆还有没有哪个聊天软件能有效避免被言论管制？
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杀软一直avast，不能更新了，都没用过内置的vpn。今天想看看能否登上官网，竟然跳转到一黄网。要被爹妈看见，真是有嘴都说不清。对政府无语。
用自由门翻墙后看到关于你们的一篇文章，然后第一次来这里，我要说一声：谢谢！你们辛苦了！
我是来点赞的，不过说实话我不知道这网站有啥用呢。。翻墙没用上啊。。
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Thanks, really helped me alot, just have my blog (TSFZ UK) tested, it is 100% blocked...I don't understand why a blog about health & entertainment is not available..
Hi, I have put the widget on my homepage, but always see this error message: "Sorry, that seems to be an invalid URL." My URL is http://jinglei.ren.systems. Would you kindly accept these new domain extensions like mine? Many thanks!
Dear Sir:
this week I travel to China, and happen to learn that our co website: www.hkaac.net was 100% blocked
(Blocked URLS, as per your website test). Actually our website is purely a professional technical machine website. If you get any idea that why our website was fully blocked. Any suggest of remedy? Thank you very much for your kind attention.
We love our country, but we strongly against the Internet policy in China.
Hey I just found your page and I'm happy to know my website http://binaryeuropa.com/ is 0% censored in China.
Appreciate what y'all are doing. Good work. Feel like Xi is closing up the country in all senses. Yaks.
I'm Chinese. I really appreciate your amazing efforts and work, and truly thank you all for your contributions to everyone with access to this website.
傻逼，操尼玛
I have to say that you guys are freaking awesome!
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