According to a report by the Open Observatory of Network Interference (OONI), China started blocking all language editions of Wikipedia last month.
Previously, most editions of Wikipedia — besides the Chinese language version, which was reportedly blocked in 2015 — were available, OONI said in their report.
AFP could not open any of Wikipedia’s versions in China on Wednesday.
“At the end of the day, the content that really matters is Chinese-language content,” said Charlie Smith, the pseudonym of one of the co-founders of Greatfire.org, which tracks online censorship in China.
Wikimedia Foundation, the non-profit organisation that operates Wikipedia, said it had not received any notices explaining the latest block.
According to the organisation, Wikipedia has been blocked intermittently in China since 2004.
“When one country, region, or culture cannot join the global conversation on Wikipedia, the entire world is poorer,” she said.
Topics that are deemed too “sensitive” are also scrubbed, such as the 1989 crackdown on Tiananmen pro-democracy protesters which will mark its 30th anniversary on June 4.
The expanded block of Wikipedia comes as Chinese authorities under Chinese President Xi Jinping ramp up online controls and crack down on Great Firewall circumvention tools, such as virtual private network (VPN) software.
Chinese Twitter users have also told AFP that they have experienced intimidation from local authorities — and even detention — for their tweets.
Images can also be considered taboo, he said.
“A picture is worth a thousand words, and there is no dearth of Tiananmen-related imagery on the Wikipedia website,” Smith added.