What is an antidetect browser in simple terms?

It is a browser that lets you run many separate profiles on one computer. Each profile has its own cookies, storage and browser fingerprint, so websites see each profile as a different device.

Is an antidetect browser the same as a VPN?

No. A VPN only changes your IP address for the whole device. An antidetect browser separates cookies and fingerprints per profile, and it is usually paired with a different proxy for each profile to change the IP as well.

Are antidetect browsers legal?

In most countries, using a browser that isolates profiles and changes fingerprint values is not illegal in itself. What you do with it can be illegal or break a platform's terms of service, for example fraud, ban evasion or fake engagement. This is not legal advice.

Do I need a proxy with an antidetect browser?

For managing several accounts, yes. Without a separate proxy per profile, every profile shares your real IP address, which is one of the strongest signals sites use to link accounts.

Can websites still detect an antidetect browser?

Sometimes. Detection systems look for inconsistent fingerprints, outdated browser cores, leaks such as WebRTC, and unusual behavior. A well-configured profile reduces these signals but no tool can guarantee that a profile will never be flagged.

Which proxy type works best with an antidetect browser?

Residential, mobile and ISP proxies are the common choices because their IPs belong to consumer networks. Static or sticky IPs are usually preferred so each profile keeps a stable location and address over time.

What Is an Antidetect Browser? A Complete Guide

An antidetect browser is a web browser built to run many separate browser profiles on one computer, where each profile looks to websites like a different person on a different device. Marketers, agencies, online sellers and QA teams use them to manage multiple accounts or test sites from many locations without the accounts being tied together. This guide explains how websites link accounts, what a browser fingerprint is, how antidetect browsers work under the hood, how to pair them with proxies, and where their limits are.

A plain-English definition

A normal browser is one identity. Every tab shares the same cookies, the same saved logins and the same set of device details that websites can read. If you log in to two accounts on the same site from the same browser, the site can see that both logins came from one device.

An antidetect browser splits that one identity into many. Each profile is a sealed container with:

its own cookies, local storage, cache and saved logins
its own browser fingerprint, such as screen size, timezone, language, fonts and graphics card details
its own network route, usually a dedicated proxy

From a website's point of view, ten profiles can look like ten separate visitors. You open a profile, it launches a browser window with that identity, and anything you do stays inside that profile.

The problem it solves: how websites link accounts

Websites, ad networks and fraud-prevention systems want to know whether two sessions belong to the same person. They mainly use three groups of signals.

IP address

Your IP address shows your approximate location, your internet provider and whether the address belongs to a home connection, a mobile carrier or a data center. Several accounts logging in from the same IP is one of the simplest links a platform can make. For background on how IP addresses and proxies work, see our guide on what a proxy is.

Cookies and browser storage

Cookies, local storage, IndexedDB and cache entries can hold identifiers that survive between visits. If account A leaves a cookie behind and account B is opened in the same browser, the site can read that cookie and connect the two.

Browser fingerprint

Even with a new IP and cleared cookies, your browser still reveals many technical details about your device. Combined, these details are often unique enough to recognize the same device again. This is called browser fingerprinting, and it is the main problem antidetect browsers are designed to handle.

What is a browser fingerprint?

A browser fingerprint is a set of attributes that a website collects through JavaScript, HTTP headers and the network connection itself. No single value is unique. A common screen resolution or timezone is shared by millions of people. The combination of dozens of values, however, can narrow a visitor down to a small group or a single device.

Fingerprint signals and what they reveal

Signal	Where it comes from	What it reveals
User agent	HTTP header and `navigator.userAgent`	Browser, browser version, operating system
Client hints	`Sec-CH-UA` headers and `navigator.userAgentData`	Browser brand and version, platform, and on request more detail such as OS version or device model
Screen and window size	`screen` and `window` properties	Monitor resolution, available screen area, color depth, device pixel ratio
Timezone	`Intl.DateTimeFormat` and date functions	Your local time zone, which should match your IP location
Language and locale	`Accept-Language` header and `navigator.languages`	Preferred languages and regional formatting
Fonts	Font measurement scripts	Installed fonts, which differ by operating system and installed software
Canvas	HTML5 canvas rendering	Tiny differences in how your graphics stack draws text and shapes
WebGL	WebGL parameters and rendering	GPU vendor and renderer strings, supported extensions, rendering output
AudioContext	Web Audio API processing	Small differences in how your system processes an audio signal
WebRTC	Peer connection and ICE candidates	Can expose your real public IP even when a proxy is set, if not handled
Hardware concurrency	`navigator.hardwareConcurrency`	Number of logical CPU cores
Device memory	`navigator.deviceMemory` (Chromium)	Approximate RAM, reported as a rounded value
Media devices	`navigator.mediaDevices`	Number and type of cameras, microphones and speakers
Battery	Battery Status API (some Chromium browsers)	Charge level and charging state; Firefox removed this API for privacy reasons
Plugins and MIME types	`navigator.plugins`	Mostly standardized in modern browsers, but a wrong or empty list can look unusual
TLS fingerprint	The TLS handshake (methods such as JA3 or JA4)	Which TLS library and settings your client uses
HTTP/2 fingerprint	HTTP/2 settings, frame order and header order	Whether the network stack matches the browser the user agent claims to be

The last two rows matter because they are read from the network connection, not from JavaScript. If a profile claims to be Chrome on Windows but its TLS or HTTP/2 handshake looks like a different client, that mismatch is easy for a server to spot.

Why consistency matters more than uniqueness

Fingerprinting systems are not only looking for a value they have seen before. They also check whether the values make sense together. A Mac user agent with a Windows-only font list, a mobile screen size on a desktop GPU, or a German IP with a Los Angeles timezone are all contradictions. A contradictory fingerprint can draw more attention than a common one.

How antidetect browsers work

Antidetect browsers combine profile isolation with fingerprint control. The details vary by product, but the main parts are the same.

Isolated profiles

Each profile has its own data directory on disk or in the cloud. Cookies, local storage, IndexedDB, cache, history, saved passwords and installed extensions are kept separate. Opening profile A never exposes data from profile B. This is similar to running separate user profiles in a regular browser, but with the fingerprint and proxy settings attached to each one.

Fingerprint spoofing vs fingerprint consistency

Early tools focused on spoofing, which means replacing real values with fake ones. Modern antidetect browsers focus more on consistency, which means producing a full set of values that a real device could plausibly have. Changing one value in isolation, such as the user agent, often creates the mismatches described above.

To build realistic fingerprints, many vendors draw on collections of configurations seen on real devices. When you create a profile for "Windows, Chrome", the browser picks a matching combination of screen size, GPU, fonts, CPU cores and other values instead of generating random numbers.

Noise vs masking

For signals that depend on rendering, such as canvas, WebGL and audio, there are two common approaches:

Noise. The browser adds small, stable changes to the output so the hash differs from your real device. The noise must stay the same for a profile across sessions, or the profile looks like a new device each time.
Masking or substitution. The browser reports values taken from another real configuration, such as a different GPU renderer string, or blocks access to the value.

Each method has tradeoffs. Random noise that changes on every page load is easy to detect, while blocking an API entirely can be unusual because most real browsers allow it. Test sites can show whether a profile's canvas or WebGL output looks natural.

Matching IP, timezone, language and location

A profile's network identity and its fingerprint must agree. Most antidetect browsers can read the proxy's IP location and set the timezone, language, geolocation and WebRTC IP to match it automatically. If the proxy exits in Chicago, the profile should report a Chicago-area timezone, an English locale and a public IP from that proxy.

Browser engines and cores

Antidetect browsers are not written from scratch. They are built on an existing browser engine, often called the "core".

Chromium-based cores are the most common because Chrome and other Chromium browsers hold the largest share of desktop users, so a Chromium fingerprint blends in with the crowd.
Firefox-based cores are offered by some products. They suit tasks where a Firefox identity is useful, but Firefox has a smaller market share, so these profiles belong to a smaller crowd.

Why the core version must keep up

Chrome and Firefox ship a new major version roughly every four weeks. If a profile claims to be a recent Chrome version in its user agent but its engine is several versions older, the gap can show up in supported JavaScript features, client hints and TLS behavior. Websites also see very few real users on old versions, so an outdated core stands out. When you compare tools, check how quickly the vendor releases a new core after each Chrome or Firefox release.

Pairing an antidetect browser with proxies

An antidetect browser handles cookies and fingerprints. It does not give you new IP addresses. For that you need a proxy for each profile.

One proxy per profile

The basic rule is simple: assign one proxy, and ideally one stable IP, to each profile. If two profiles share an IP, the platform can link them through that IP no matter how different their fingerprints are. Avoid rotating IPs on every request for logged-in accounts, because a session that jumps between cities looks suspicious.

Which proxy types fit

Proxy type	Why it is used with antidetect browsers	Things to watch
Residential	IPs from home internet connections, so they look like normal users	Choose sticky sessions so the IP stays the same during work
Mobile	IPs from mobile carriers, often shared by many real users, so platforms tend to be careful about blocking them	Usually more expensive and IPs can change when the carrier reassigns them
ISP	Static IPs registered to consumer internet providers but hosted in data centers, so they are fast and stable	Smaller pools and fewer locations than rotating residential networks
Datacenter	Cheap and fast	Easy to identify as non-residential, so often a poor fit for account management

You can compare providers in our proxy provider directory.

Proxy checks before you start

Most antidetect browsers include a proxy checker. Before you log in to an account, confirm that:

the proxy connects and shows the expected country and city
the profile's timezone, language and geolocation match that location
WebRTC shows the proxy IP, not your real IP
the IP is not flagged on common blocklists or listed as a known hosting range, if residential appearance matters to you

The fingerprint is only half the setup

A well-built profile on a shared, flagged or mismatched proxy will still get linked or blocked. Treat the proxy as part of the profile's identity, keep it stable, and do not reuse it across profiles.

Key features to know

Antidetect browsers have grown into account-management platforms. These are the features you will see most often.

Profile management

Bulk creation and import. Create dozens of profiles at once, or import a list of profiles with their proxies from a file.
Groups, tags and notes. Organize profiles by client, platform or project.
Cookie import and export. Load existing cookies into a profile so you can continue a session, or move cookies between environments.
Extensions. Install browser extensions per profile or across many profiles.

Team collaboration

Team members and roles. Give staff access to specific profiles with permissions such as view, launch or edit.
Profile sharing and transfer. Share a profile with a teammate or move it to another account without exposing passwords.
Cloud sync. Store profiles on the vendor's servers so the same profile opens with the same data on another computer. Some tools also offer local-only storage.

Automation

Local API. Start, stop and manage profiles with code.
Selenium, Puppeteer and Playwright. Many tools let you attach these frameworks to a running profile, usually through the Chrome DevTools Protocol or WebDriver, so scripts run inside the profile's fingerprint and proxy.
RPA and no-code automation. Visual builders that record or chain actions such as clicking, typing and scrolling without code.
Synchronizer. Mirror actions from one main window to many profile windows at once.

Mobile emulation and cloud phones

Some tools offer Android profiles that emulate a mobile browser fingerprint, and a few provide cloud phones, which are remote Android devices or virtual instances for apps that only run on mobile. Emulating a mobile browser on a desktop is harder to get right than a desktop profile, because touch support, sensors and screen behavior must all match.

Pricing models in general

Pricing varies widely, but most products use some mix of these models:

Free tiers with a small number of profiles, often with limited team or automation features.
Tiered plans by profile count, where the price rises with the number of profiles you can store.
Team seats, where extra users cost more or higher tiers include more members.
Add-ons such as extra cloud phones, more automation runs or built-in proxy traffic.

When you compare plans, check how many profiles you can create versus how many you can run at once, whether deleted profiles still count against your limit, and which features are locked to higher tiers. Current plans are listed on our antidetect browser directory.

Legitimate use cases

Antidetect browsers are used in many normal business workflows:

Affiliate and performance marketing. Running campaigns for several clients or brands with separate ad accounts, and checking how landing pages and ads look in different countries.
Social media management. Agencies managing many client accounts need each account to keep its own login, location and history.
E-commerce sellers. Businesses that run several stores or brands on marketplaces keep each store's sessions separate, within the rules each marketplace sets.
Ad verification. Checking that ads appear correctly and are not served to the wrong audience or on fraudulent sites, from the point of view of real users in each market.
Web scraping and QA testing. Testing how a site behaves for users in different regions, languages and devices, or collecting public data with realistic browser sessions. For high-volume scraping, a scraping API is often simpler.
Privacy. Separating personal, work and research browsing so trackers cannot easily build one combined profile of you.

Misuse risks

The same features can be misused. Antidetect browsers are also used for payment and account fraud, creating fake accounts at scale, fake reviews and engagement, bonus abuse and evading bans a platform has placed on an account. Fraud-prevention teams study these tools closely for this reason.

Even for legitimate users, running multiple accounts may break a platform's terms of service. Some platforms allow several accounts if you follow their rules, others require one account per person or business, and most forbid creating new accounts to get around a suspension. Breaking these rules can lead to permanent bans of all linked accounts, lost ad spend or held payouts.

Is it legal?

In most countries, simply using a browser that keeps profiles separate and changes the values it reports to websites is not illegal. Fingerprint protection is also a privacy feature in mainstream browsers, such as Firefox and Brave.

Legality depends on what you do with it. Fraud, identity theft, unauthorized access and deceptive practices are illegal regardless of the tool. Platform terms of service are a separate layer: breaking them is usually a contract issue rather than a crime, but it can still cost you your accounts. Laws differ by country, so check with a qualified lawyer if your use case is borderline. This section is general information, not legal advice.

What antidetect browsers cannot do

It helps to be clear about the limits before you rely on one.

Behavioral signals. Platforms look at how you type, move the mouse, scroll and navigate, and at what times you are active. Identical routines across profiles, or obviously scripted behavior, can link or flag accounts.
Payment and phone linking. If two accounts use the same card, bank account, phone number, address or tax ID, the platform can link them regardless of fingerprints.
Account history and content. Reused profile photos, bios, product listings or ad creatives can connect accounts. A brand-new account also starts with less trust than an older one with normal history.
Platform-side decisions. Detection methods change over time. No antidetect browser can guarantee that a profile will never be flagged.
Network-level leaks outside the browser. Other apps on your computer, such as desktop clients, are not covered by the browser's profile or proxy.

A tool, not a guarantee

An antidetect browser removes technical links between profiles. It does not change who owns an account, how you behave, or what a platform's rules allow. Results depend on the whole setup, not on the browser alone.

How to choose an antidetect browser

Use this checklist when comparing tools:

Fingerprint quality. Do profiles pass common fingerprint tests without obvious mismatches? Are canvas, WebGL and audio values stable within a profile?
Core update cadence. How soon after a new Chrome or Firefox release does the vendor ship a matching core?
Platforms. Does it run on Windows, macOS and Linux, and does it offer mobile profiles if you need them?
Free profiles and trial. Can you test with a few profiles before paying?
Team features. Roles, permissions, profile sharing and activity logs.
Automation. A documented local API and support for Selenium, Puppeteer or Playwright, plus RPA if you do not code.
Proxy integration. Per-profile proxy settings, support for HTTP and SOCKS5, bulk proxy import and a built-in proxy checker.
Storage and security. Cloud vs local storage, encryption of profile data, two-factor login for your account, and what the vendor can access.
Support and documentation. Response times, language coverage and clear guides.
Pricing. Profile limits, team seat costs, and which features sit behind higher tiers.

Our review process explains how we test these points.

Best practices for setting up a profile

Pick a realistic base. Choose an operating system and browser that match your real computer where possible. A Windows profile on a Mac host is common, but rendering signals are easier to keep consistent when the host matches.
Assign a dedicated proxy. One stable proxy per profile, from a location that makes sense for the account.
Match timezone, language and geolocation to the proxy. Use the browser's automatic matching, then check the result.
Leave fingerprint settings at sensible defaults. Avoid changing individual values unless you know why. Random edits often create mismatches.
Test the profile. Before logging in to an account, open fingerprint test sites such as BrowserLeaks (browserleaks.com), Pixelscan and CreepJS. They show your IP, WebRTC results, timezone, canvas and WebGL output and any inconsistencies. Different sites use different checks, so treat their scores as hints rather than final verdicts.
Warm up new accounts. Use a new profile for normal browsing for a while before heavy activity. Sign in, browse, and build history gradually instead of running large actions on day one.
Keep one account per profile. Do not log in to two accounts on the same platform inside one profile.
Never share proxies between profiles. That includes reusing a proxy after deleting a profile that was linked to a banned account.
Keep the browser and core updated. Update the app so profiles use a current engine.

Troubleshooting common problems

Accounts are still getting linked

Check for shared signals outside the fingerprint: the same proxy or IP range, the same payment method or phone number, reused content, or logging in to both accounts from the same profile at some point. Also check whether the platform could have linked them before you moved to separate profiles.

WebRTC is leaking your real IP

Open a WebRTC test page inside the profile. If it shows your real IP instead of the proxy IP, set WebRTC to the mode that replaces it with the proxy IP, which most tools offer. Fully disabling WebRTC hides the leak but can look unusual, since most real browsers have it on.

Timezone or language does not match the IP

This usually happens when the proxy changes location after the profile was created, or when automatic matching is turned off. Re-run the proxy check, then update the timezone, language and geolocation to match the current IP.

Frequent CAPTCHAs or verification prompts

CAPTCHAs often point to the IP rather than the fingerprint. Check whether the proxy is a datacenter IP, is shared by many users, or has a poor reputation. Other causes include an outdated core, fast scripted actions, or a brand-new account with no history.

A profile suddenly fails fingerprint tests

After a browser or core update, recheck the profile on test sites. If it now shows mismatches, contact the vendor's support, since the issue may be in the core rather than your settings.

Antidetect browser vs VPN vs incognito vs multi-profile browsers

Feature	Antidetect browser	VPN	Incognito or private window	Regular multi-profile browser
Separate cookies and storage	Yes, per profile	No	Yes, but cleared when closed	Yes, per profile
Different fingerprint per identity	Yes	No	No	No
Different IP per identity	Yes, with a proxy per profile	One IP for the whole device	No	No
Timezone and language matched to IP	Yes, usually automatic	No	No	No
Persistent sessions	Yes	Not applicable	No	Yes
Team sharing and automation	Often built in	No	No	Limited
Main purpose	Running many separate identities	Encrypting traffic and changing location	Not saving local history	Separating your own work and personal browsing

A VPN changes your IP for the whole device and encrypts traffic, but every account still shares one fingerprint. Incognito mode stops your browser from saving history locally but does not hide your fingerprint or IP. Regular browser profiles separate cookies but report the same device details from every profile.

Glossary

Antidetect browser: A browser that runs isolated profiles, each with its own storage, fingerprint and usually its own proxy.
Browser fingerprint: The combination of device and browser attributes a website can read to recognize a visitor.
Profile: One isolated browser identity with its own cookies, settings, fingerprint and proxy.
Core: The browser engine an antidetect browser is built on, typically Chromium or Firefox.
Canvas fingerprint: A hash of how your system renders an image drawn with the HTML5 canvas.
WebGL fingerprint: GPU vendor, renderer and rendering output read through the WebGL API.
Client hints: Headers and JavaScript values that Chromium browsers use to share browser and device details.
WebRTC leak: When WebRTC reveals your real IP address despite a proxy or VPN.
TLS fingerprint: A signature of the TLS handshake, often summarized with methods such as JA3 or JA4.
Noise: Small, stable changes added to rendering output so it differs from the real device.
Sticky session: A proxy setting that keeps the same IP for a set period.
Warm-up: Using a new account normally for a while to build history before heavier activity.
Synchronizer: A feature that copies actions from one browser window to many profiles at once.
Cloud phone: A remote Android device or virtual instance used to run mobile apps per profile.

Next steps

Compare tools, platforms and free plans in our antidetect browser directory.
Learn how proxies work in What is a proxy?, then browse residential, mobile and ISP proxy providers.
If your goal is data collection rather than account management, read What is a scraping API?.
See how we test and score tools in our review process.