This guide explains what an anti-detect (fingerprint) browser is, why websites flag devices, and how professionals run multiple accounts safely from a single computer. Modern sites don’t only see your IP—they aggregate a browser fingerprint (User-Agent, OS, screen size, time zone, language, WebGL/Canvas, fonts, hardware hints, cookies) to create a stable digital identity. If you log into several client or business profiles from one device, platforms may link the sessions and restrict or ban the accounts. An anti-detect browser isolates each profile into its own environment with unique fingerprint parameters, separate cookies/local storage, and a dedicated proxy and time zone—so each profile behaves like a different device from a targeted region (e.g., US for TikTok/YouTube research and ad testing). Typical workflow: create a profile per client/project/ad account, assign a location-matched residential/static proxy, set time zone/GeoIP, launch an isolated window, and operate normally without cross-contamination. Use cases include agency work (Facebook/Google/TikTok Ads), freelance SMM, affiliate marketing, dropshipping, cross-border eCommerce, moderation/QA, and location-specific market research. Best practices: be policy-compliant, keep behavior human and consistent, dedicate one proxy per profile, warm up new accounts gradually, enable 2FA/passkeys, and never reuse cookies or device IDs across unrelated profiles. This article draws on a demo showing how profile isolation reduces ban risk and allows managing 100+ profiles from a single dashboard while preserving privacy and operational safety.