Fast Keyword Highlighter

Highlight keyword lists on any page. Regex supported. 1,000+ keywords stay smooth. No ads, no login, no network requests.

No ads. No affiliate links. No accounts. No network requests. Your keyword lists never leave your browser. Fast Keyword Highlighter marks all your keywords on every page you visit — and keeps highlighting new content as it appears: infinite scroll, comments, live chats, popups and iframes. NEW IN 0.3.0 • Regular expressions: add lines like /\b\d{4}-\d{2}-\d{2}\b/ or /error|warn/i to any list • Click-to-copy: one click on a highlight can copy the word — or the word + page URL + time — straight to your clipboard • Highlighting now also works inside about:blank / srcdoc embedded frames WHY IT STAYS FAST Built on an Aho-Corasick automaton: one pass over the page finds every keyword, whether you track 10 or 1,000+. Work is sliced into 8 ms chunks so the page never freezes. FEATURES • Multiple keyword lists, each with its own colour • Regex lines (/pattern/flags) alongside plain keywords, in the same list • Click action per list: do nothing / copy the word / copy word + source • Whole-word and case-sensitive matching per list • Site rules: show a list only on example.com/jobs — wildcards supported • Keeps up with dynamic pages: infinite scroll, load-more, auto-refreshing panels • Works inside shadow DOM and iframes • Jump between matches with Alt+Shift+N / Alt+Shift+P; toggle all with Alt+Shift+H • Pause highlighting per site or globally, in one click MIGRATE IN ONE CLICK Import your existing keyword lists from Highlight This and Multi Find backups, plain .txt word lists, or .csv files. Switching takes under a minute. PRIVACY 100% local. No analytics, no tracking, no accounts, no server. The extension holds zero network permissions — it physically cannot send your data anywhere.