An antidetect browser is a browser built to run many isolated profiles, each with its own stable, plausible fingerprint and its own storage, so that a website cannot tell they are on the same computer. Ordinary browsers leak dozens of small facts about your machine that, combined, identify it as reliably as a cookie — and they leak the same facts to every site, from every account. Antidetect browsers replace those facts per profile. But they only handle what the browser reveals; where the connection comes from is the proxy's job, and an antidetect profile without a matching proxy is half a disguise.

The problem: your browser is a fingerprint

Delete cookies, use a fresh incognito window, change IP — and a site can often still recognise you. It does so by asking the browser questions whose answers, taken together, are close to unique:

  • User-Agent and the newer client hints: browser, version, OS, architecture.
  • Screen resolution, colour depth, device pixel ratio, window size.
  • Canvas fingerprint: the site draws hidden text and shapes and hashes the pixels; tiny differences in GPU, drivers and fonts make the hash machine-specific.
  • WebGL: renderer and vendor strings (“ANGLE (NVIDIA GeForce…)”), plus a rendered-image hash.
  • AudioContext: an audio signal is processed and hashed; the result varies by hardware and OS.
  • Installed fonts, measured by rendering test strings.
  • Time zone, languages, platform, hardware concurrency (CPU cores), device memory, touch support.
  • WebRTC: local and public IP addresses exposed during connection negotiation.
  • Storage: cookies, localStorage, IndexedDB, cache — shared across tabs and, in a normal browser, across every “account” you log into.

Any one of these is common. The combination is rare enough that anti-fraud vendors treat it as an identifier. Two accounts logged in from the same fingerprint are, to the platform, the same person — regardless of IP.

What an antidetect browser does

It is usually a Chromium (sometimes Firefox) build with a profile manager on top. For each profile it:

  1. Generates or lets you set a fingerprint — a coherent bundle of OS, browser version, screen, fonts, GPU strings, canvas and audio noise, time zone and language — drawn from distributions of real devices so the result looks like a real machine, not a random one.
  2. Keeps that fingerprint stable across sessions. Consistency matters as much as uniqueness: a profile whose GPU changes every day is more suspicious than one that is merely rare.
  3. Isolates storage completely: separate cookies, cache, local storage and extensions per profile. Logging into account A in profile 1 leaves no trace visible to profile 2.
  4. Handles WebRTC — disabling it or spoofing the exposed IP to match the profile's proxy.
  5. Binds a proxy to the profile, so that profile's traffic always exits from the same address, and lets you set time zone and geolocation to match it (or derives them from the proxy automatically).

The result is that ten profiles look, to a website, like ten different people on ten different computers in ten different places — provided each has its own proxy.

Why the proxy is not optional

A fingerprint answers “what device is this?” An IP address answers “where is this connection from?” Anti-fraud systems check that the two agree, and they link accounts on either one.

  • Ten perfect fingerprints from one IP are ten accounts from one address. Linked.
  • One fingerprint across ten IPs is one device hopping around the world. Linked, and flagged.
  • A profile claiming to be a Windows laptop in Madrid, on a Spanish-language system, in the Europe/Madrid time zone, connecting through a Vietnamese datacenter IP — is a contradiction the fraud model scores heavily.

So the rule is one profile, one proxy, one consistent story: the IP's country and city should match the profile's time zone, language and (if used) geolocation; the IP type should match the claimed device — a mobile carrier IP for a phone profile, a residential ISP for a home desktop. Which proxy type fits which case is covered in Residential vs datacenter vs mobile proxies; the practical ranking is our antidetect-browser proxy comparison.

Static or rotating?

For a profile that represents a persistent identity — an account you log into repeatedly — use a static IP: an ISP proxy or a dedicated mobile port. Rotating the IP under a stable fingerprint is exactly the “device hopping around” pattern above. Rotation belongs to stateless scraping, not to accounts. See what IP rotation is for the distinction.

How to configure the pair correctly

  1. Buy the proxy first, in the country and of the type the identity should have.
  2. Create the profile. Choose an OS and browser version that a real user of the target platform would plausibly have.
  3. Enter the proxy in the profile settings. Most antidetect browsers will test it and read back its IP and location.
  4. Set time zone and language to the proxy's location — or enable “from IP” if offered.
  5. Set WebRTC to replace (spoof to the proxy IP) or disable; never real.
  6. Open the profile and run the checks from How to test a proxy: IP, DNS, WebRTC, and a fingerprint-consistency page. Fix mismatches before logging into anything.
  7. Use the profile only for that identity. Do not log account B into profile A “just once.”

What antidetect browsers are used for

  • Multi-account operations on marketplaces, social networks and ad platforms — running several seller, brand or client accounts that the platform would otherwise link.
  • Agency work: managing dozens of clients' accounts from one team without cross-contamination.
  • Affiliate marketing and traffic arbitrage, where each campaign has its own accounts and payment identity.
  • QA and research: seeing a site as different device/location combinations; testing your own anti-fraud.
  • Privacy: separating personal, work and pseudonymous browsing so they cannot be joined by fingerprint.

What they do not do

  • They do not make bad behaviour invisible. Ten profiles that all wake at 09:00, post the same text and follow the same accounts are linked by behaviour, fingerprint or not.
  • They do not fix a burned proxy. A profile on an IP the platform already dislikes inherits that dislike.
  • They do not survive being shared between accounts. Once two identities have touched a profile's storage, they are joined.
  • They do not replace warm-up. New profile + new IP + immediate heavy activity is the classic bot pattern; see our notes on warm-up and farming.

Choosing one

The market has a dozen serious products, and our software catalogue lists the ones tested with mobile and residential proxies. When comparing, look at: whether fingerprints are drawn from real-device data (not random values); how well the WebRTC and time zone handling follows the proxy; team features (shared profiles, roles, audit); automation APIs (Puppeteer/Playwright/Selenium hooks); and pricing per profile. Free tiers exist for a handful of profiles; production use is priced per month by profile count.

Frequently asked questions

Is an antidetect browser the same as incognito mode?

No. Incognito clears cookies at the end of the session but presents exactly the same fingerprint as your normal window. An antidetect browser presents a different fingerprint per profile and keeps each profile's storage separate and persistent.

Do I need a proxy for every profile?

For every profile that represents a distinct identity, yes — its own IP, matching its claimed location and device type. Profiles sharing an IP are profiles a platform can link.

Which proxy type is best for antidetect browsers?

For persistent accounts: static residential (ISP) or dedicated mobile, matched to the platform — mobile for mobile-first apps, residential for desktop-oriented sites. Datacenter IPs are cheap but are the first thing anti-fraud flags. Rotating pools are for scraping, not for accounts.

Can websites detect antidetect browsers?

Poorly configured ones, yes — impossible hardware combinations, WebRTC showing a different IP than the proxy, time zone contradicting location. Well-configured ones are designed to be indistinguishable from real devices; whether they succeed depends on the product's fingerprint data quality and on your consistency.

The software is legal to own and use; it is a browser with configurable fingerprints. Using it to violate a platform's terms of service or for fraud is a matter of those terms and of law, as with any tool.

Can I automate an antidetect browser?

Most expose a local API to launch profiles and return a debugging port for Puppeteer, Playwright or Selenium, so scripts drive a fully fingerprinted, proxied browser instead of a bare headless one.