NDT User-Agent Manager

Switch, validate, and manage User-Agent profiles with a clean, privacy-first workflow.

NDT User-Agent Manager is a modern, privacy-first tool for switching and managing browser User-Agent profiles. Choose from updated browser and device profiles, apply a profile to the current tab or all tabs, create and validate a custom User-Agent, and open a dedicated test page to inspect the active browser identity. Key features: • Updated User-Agent profile catalog • Searchable browser and device selectors • Apply to the current tab or all tabs • Favorites and recently used profiles • Pin favorite profiles to the top of the list • Per-site profile mapping: assign one profile to multiple domains • Custom User-Agent validation and saving • User-Agent test page with browser and fingerprint-related diagnostics • Context-menu quick actions • Import and export settings • Automatic profile-data refresh and local caching • Dark/light theme and multilingual interface • Local-first storage: settings, favorites, recent profiles, and domain mappings stay in Chrome storage NDT User-Agent Manager is designed for developers, QA testers, web professionals, and anyone who needs reliable browser identity testing with a clean workflow.