Site Blocker – Block Distracting Websites

Block distracting websites, then lock your list for 15 to 60 minutes of focus. Free, no account, no tracking.

Site Blocker is a free Chrome extension that blocks distracting websites and locks your block list during focus sessions, built for students, remote workers and anyone who wants fewer distractions at the computer. You add the sites that waste your time, and Site Blocker redirects them to a blocked page, including tabs that are already open. A focus lock of 15, 25, 45 or 60 minutes prevents removing sites, pausing blocking or taking a break until the timer ends, and the toolbar badge shows the minutes left. Outside a lock, the blocked page offers an "Allow 5 minutes" option, so a site you genuinely need is never out of reach. Built on Chrome's Manifest V3, Site Blocker needs no account, has no analytics and keeps the block list only in the browser on your device. The result is a simple commitment tool for studying and deep work. ✨ FEATURES • Blocks any website and its subdomains. Add a site by typing its address, or click "Block this site" while you are on it. • Applies right away, including to tabs that are already open. • Focus lock for 15, 25, 45 or 60 minutes, with a live countdown and progress bar in the popup. • "Allow 5 minutes" on the blocked page outside a focus lock. The site is blocked again the moment time is up. • Pause or resume a single site, or pause everything with the main switch. • Undo after every change, with no confirmation dialogs. • "Go back" on the blocked page returns you to where you came from. • Right-click a site for Pause and Remove. The Delete key works too. • Light and dark mode, keyboard support, and reduced-motion support. 👤 WHO SITE BLOCKER IS FOR Site Blocker is for people studying for exams, doing deep work or writing, working remotely or freelancing, and anyone cutting down on social media, news, video or shopping sites. It is free, with no ads and no upsells. ❓ FREQUENTLY ASKED QUESTIONS How do I block a website in Chrome? Install Site Blocker, click its toolbar icon, type the site's address and press Enter, or click "Block this site" while you are on it. Can I stop myself from unblocking sites? Yes. Start a focus lock for 15, 25, 45 or 60 minutes. Until it ends, Site Blocker does not let you edit or pause the list. Does Site Blocker work on tabs that are already open? Yes. Blocking applies immediately, without a refresh. Does Site Blocker collect my data? No. The block list stays on your device, and Site Blocker has no accounts, servers or analytics. Is Site Blocker free? Yes. 🔒 PRIVACY Everything is stored locally in your browser. Site Blocker has no servers and no third-party services, and it never sends your block list or browsing activity anywhere. It reads only the address of a page to decide whether to block it, never the page content. To make "Go back" reliable, the last few addresses of each tab are kept in memory only and are cleared when you close the browser. 🔑 PERMISSIONS EXPLAINED • webNavigation: sees the address of a page being opened so a blocked site can be redirected. No page content is read. • tabs: finds tabs already open on a site you just blocked, so blocking takes effect immediately. Only addresses are read. • storage: saves your block list and settings on your device. • alarms: keeps the toolbar countdown up to date during a focus lock or a 5-minute allowance. • favicon: shows site icons from Chrome's own cache. For sites you have not visited, the icon is loaded directly from that site, never through a third-party service. • activeTab: offers one-tap "Block this site" for the tab you are on, only when you open the popup. ⚠️ GOOD TO KNOW • Chrome only runs extensions in Incognito if you turn on "Allow in Incognito" for Site Blocker in chrome://extensions. • A focus lock stops you from changing the block list, but it cannot stop you from disabling or uninstalling the extension in chrome://extensions. It is a commitment tool, not a parental control.