UK’s Ofcom has fined 4chan a total of £520,000 ($690,000) over the website’s failure to comply with the rules of Online Safety Act 2023. The biggest chunk of the amount came from 4chan’s failure to ensure children cannot encounter pornographic content on its website by implementing an effective age check mechanism. For that violation, the website has received a penalty of £450,000 ($598,000) and an order to apply an age check system by April 2. It carries a daily rate penalty of £500 ($664) until the website is compliant or until June 1, whichever comes sooner.

Ofcom also found that 4chan has failed to carry out sufficient illegal content risk assessment on its website and has fined it £50,000 ($66,400) for that violation. 4chan has until April 2 to conduct a risk assessment, or it has to pay an additional £200 ($266) per day. Finally, the regulator has determined that 4chan failed to include provisions in its terms of service that specify how it protects users from illegal content. That carries a fine of £20,000 ($26,600), with a daily rate penalty of £100 ($133) a day from its compliance deadline of April 2 to June 1.

The regulator started investigating 4chan, famous for its anonymous and unmoderated messaging boards, in June 2025 to determine if it was failing to meet its obligations under the law. In October, Ofcom announced its decision for some of the investigations it opened. It slapped 4chan with a £20,000 ($26,700) fine for ignoring its requests for a copy of the website’s illegal harms risk assessment and to provide information about its qualifying worldwide revenue. The regulator has confirmed to Engadget that 4chan has yet to pay that previous fine, which also earned cumulative daily punishment fees for 60 days.