How much did UK fine 4chan for OSA violations?

UK fines 4chan nearly $700,000 for Online Safety Act failures

The UK’s media regulator, Ofcom, has fined 4chan a total of £520,000 (about $690,000) for failing to meet obligations under the Online Safety Act 2023. The fine includes a major penalty component tied to age assurance.

Ofcom’s sanction is significant because the Online Safety Act focuses on reducing harm by ensuring platforms implement effective safeguards—especially for minors. In this case, the largest portion of the penalty came from a specific requirement: age assurance checks.

Breakdown of the penalty

• Total fine: £520,000
• Largest component: £450,000 for failing to implement age assurance checks
• The platform was given a deadline to comply: until April 2 to put required measures in place

Why it matters

The decision underscores that Ofcom is actively enforcing the Online Safety Act with meaningful financial penalties, rather than treating compliance as optional or purely advisory. For platforms that host user-generated content, the ability to implement and demonstrate effective age assurance becomes a core operational requirement.

It also illustrates that enforcement can be structured around discrete obligations. Instead of only evaluating a platform’s overall posture, regulators can impose different parts of a fine based on which specific duties were missed.

For other online services operating in the UK, the ruling is a warning that compliance programs need to cover the mandated guardrails—particularly those meant to prevent minors from accessing adult or harmful content. The April 2 deadline adds urgency, because failure to implement required age assurance could trigger further regulatory consequences.