Netcraft Browser Extension review

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Netcraft Browser Extension is a free anti-phishing add-on for Chrome, intended for people who want browser-level warnings about malicious websites without a paid plan. It checks sites against Netcraft’s malicious-site data and can block or warn about known threats, including phishing pages and fake shops. Its standout credential feature detects when sensitive data is sent to a different domain, adding a warning beyond simply checking the site being visited.

The protection goes beyond URL blocking: Netcraft says the extension blocks malicious scripts such as JavaScript skimmers and cryptocurrency miners, and provides a risk rating for sites not yet in its database. Users can configure protection by attack type, report suspicious websites, and view website technology and hosting-provider information. These controls make the extension a more considered choice for users who want to inspect suspicious destinations and adjust what the browser flags, rather than rely on a single block-or-allow check.

The main trade-off is platform fit: the supplied platform listing is Chrome extension, so it is best suited to Chrome users rather than teams seeking protection across a broader endpoint or browser environment. The published description also notes that site checks use Netcraft’s malicious-site data, with a risk rating for sites not yet included; that rating is a signal, not a definitive verdict. Choose it for free Chrome protection that includes fake-shop and credential-leak checks. Users needing coverage beyond a browser extension should consider a broader security product.

Netcraft Browser Extension pros and cons

• Where it wins
  • Blocks or warns about known malicious websites, phishing sites, and fake shops
  • Detects credential leaks sent to a different domain
  • Lets users configure protection by attack type
• Where it doesn't
  • Coverage is limited to a Chrome extension
  • Protection relies in part on Netcraft’s malicious-site data
  • The risk rating for new sites is not a definitive classification

Netcraft Browser Extension fact sheet, pricing and score →

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Last updated 21 Oct 2026 · How we research and update