Browser Lock Scams
Pages that fake a 'locked' or 'frozen' computer to force a call to fake support.
Last reviewed: 1 June 2026
What this scam is
Browser lock scams display a full-screen page that mimics a system lock or security block, often with alarms and a warning not to restart, pushing you to call a fake support number.
How it works
A malicious page goes full-screen and plays a warning that your computer is locked due to a virus or illegal activity. It blocks normal navigation to pressure you into calling 'support', who then request access or payment.
Common red flags
- Full-screen 'your computer is locked' warning with a number
- Alarm sounds and 'do not restart' instructions
- Claims of illegal activity to scare you
- No way to close except calling
Sanitized example messages
Illustrative, sanitized examples. Personal details are replaced with placeholders such as [phone number] and [fake link].
Your computer has been locked due to suspicious activity. Call [phone number] immediately. Do not shut down.
Payment methods used
- Card
- Remote-access theft
- Gift cards
Who is usually targeted
- General users
- Older adults
What to do immediately
- Don't call; close the browser or force-quit it (you can safely restart)
- Clear the browser or reopen without restoring tabs
- Run a security scan
Evidence to preserve
- Screenshot
- The site URL
- Number displayed
Where to report it
- Action Fraud (UK) — UK national fraud & cybercrime reporting centre
- FTC ReportFraud (US) — US Federal Trade Commission fraud reports
- FBI IC3 (US) — US Internet Crime Complaint Center
- Scamwatch (Australia) — Australian competition & consumer reporting
- Your bank's fraud line — Use the number on the back of your card or in your banking app — never a number the caller gives you
Always verify reporting routes and emergency contacts on the official government or agency website for your country.
Frequently asked questions
Is my computer really locked?
Almost always no — it's a web page pretending to be a system lock. You can safely close or force-quit the browser and restart. Never call the number shown.