Block domains you choose
Custom blocked domains give users more control when a specific ad server, tracker, redirect domain or unwanted resource should be blocked locally.
Stored locally
Custom domain rules are designed to be stored in Chrome extension storage and managed through Shieldly's local dynamic rules, not uploaded automatically to a cloud dashboard.
Useful for power users
Most users can rely on default rules and regional filters. Custom domains are for users who know which domains they want to control directly.
Use a domain rule for a domain-level problem
Custom blocks are intended for hosts you deliberately want to block. Begin with the specific advertising or unwanted host you have identified rather than a site's entire main domain. A full page URL, a CSS selector and a hostname are different inputs; use the domain-oriented field as labeled. Blocking a shared service can affect more than the visible advertisement you first noticed.
Add one rule and test the useful parts of the site
After adding a domain, reload the affected page and repeat the action that exposed the unwanted content. Also check any required player, login or checkout on that site. If useful functionality breaks, remove the new rule and compare again before adding another. This makes the test reversible and connects a regression to a particular change. Keep a private note of why you added a domain if you maintain many custom entries.
Review rules when websites change
A hostname that once served only an unwanted placement may later be used differently, or a site may switch providers. Review custom blocks periodically and remove entries that no longer have a clear purpose. Export settings before a large cleanup. Do not treat a custom domain list as a curated security reputation service: the entries reflect your configuration choices and may include false positives or rules that are relevant only to your browsing.
Frequently asked questions
Should I block the entire website to remove one ad?
Usually that is too broad for the intended task. Identify the unwanted host and test a narrow change, keeping essential page functionality in mind.
Can a custom block break an embedded video?
Yes, if the blocked host provides something the player needs. Remove the recent rule and repeat the same playback test to check that possibility.
Related pages
Explore regional ad filters, import and export and advanced protection.