BlockSite for Windows

Overview

BlockSite is a browser extension designed to stop access to sites you don’t want or that distract you. It helps users maintain focus by preventing visits to specified webpages and can reroute attempts to access blocked content to safer or more useful destinations.

Main features

• Work Mode that temporarily locks access so you can concentrate without interruptions.
• A keyword blocker that prevents pages matching specified words from loading.
• Built-in adult-site blocking for parents who want family-safe browsing.
• Whitelist and blacklist controls to define which sites are always allowed and which must be stopped.
• Automatic redirection: when someone tries to open a banned page, they are sent to a replacement URL you choose.
• Support for Incognito/private browsing so the extension remains effective in private windows.
• Quick-access context menu available via a right-click for fast blocking or unblocking actions.
• Timers that lock sites for set intervals, useful for scheduling focused work periods.
• Password protection and an uninstall-guard that locks settings and warns you if removal is attempted.
• Cross-device synchronization so the same blocking rules apply on multiple machines.

Security and administrative controls

Administrators and shared-computer owners can secure the extension with a password so settings cannot be changed casually. The uninstall protection can be configured to send an alert (for example, via email) if someone tries to remove the extension, giving additional oversight for public or shared environments.

Parental and productivity options

Besides site-specific blocking, you can enable modes tailored to use cases: a strict “work” mode for blocking social or time-wasting sites, and a family mode that automatically filters adult content. The keyword filter allows you to block any page containing specific terms, giving fine-grained control over what appears in the browser.

Setup and syncing

Adding sites to the blocklist is straightforward: enter URLs or pages you want to block and, if desired, specify a redirect address for each. You can also maintain a whitelist of allowed addresses. Once configured, rules can be synced to other devices so the same restrictions follow a user across computers and browsers.

Free alternative suggestion

If you’d like to try another no-cost option, consider a widely used free site-blocking extension that focuses on scheduling and site limits as a complement or alternative to BlockSite.