Free antidetect browser stealth for Playwright: undetected Firefox fingerprint, headless or headed.
Python web scraping and captcha bypass. Open source, and it passes every bot detection test.

How it works

Anti-bots ask two questions, and reCAPTCHA, hCaptcha and Cloudflare Turnstile score the answers. invisible_playwright answers yes to both.

1. Is this a real browser? Yes. It is Firefox, patched at the C++ source level.

• The browser fingerprint is set inside the engine, not injected into the page: navigator, screen, GPU/WebGL, canvas, fonts, audio, WebRTC, timezone, network. Headless or headed, the same values either way.
• No JS shim, no override, no seam to read.

2. Is a real person using it? Yes. The actions are humanized in the driver.

• Every click, hover and drag follows a natural mouse path with human timing, no teleporting cursor.
• Each input is byte-identical to a real mouse: real input source, pressure, trusted events.

Install

pip install invisible-playwright
python -m invisible_playwright fetch      # one-time download, sha256-verified: 240 MB (Windows) / 262 MB (Linux x86_64) / 253 MB (Linux arm64), about 550 MB unpacked

Requires Python 3.11 or newer.

Supported platforms: Windows x86_64, Linux x86_64 / arm64.

Usage

Random fingerprint per session

Playwright's API, sync and async, with no code changes. The same objects, the same calls, the same return values. A few surfaces are out of scope - tracing, HAR, CDP, the API request context - and each one refuses with a sentence saying why rather than misbehaving quietly. If you already use Playwright, switching is two lines:

- from playwright.sync_api import sync_playwright
- with sync_playwright() as p:
-     browser = p.firefox.launch()
+ from invisible_playwright import InvisiblePlaywright
+ with InvisiblePlaywright() as browser:

Every session gets a distinct fingerprint (GPU, audio, fonts, screen, ~200 fields) and Bezier-curve mouse motion.

Sync

from invisible_playwright import InvisiblePlaywright

with InvisiblePlaywright(proxy={"server": "socks5://...", "username": "u", "password": "p"}) as browser:
    page = browser.new_page()
    page.goto("https://example.com")
    page.click("#submit")   # mouse arcs to the button on a Bezier curve

Async

from invisible_playwright.async_api import InvisiblePlaywright

async with InvisiblePlaywright(proxy={"server": "socks5://...", "username": "u", "password": "p"}) as browser:
    page = await browser.new_page()
    await page.goto("https://example.com")
    await page.click("#submit")

The browser object is a playwright.sync_api.Browser / playwright.async_api.Browser - every Playwright method works as-is.

Log the seed to replay a run:

sf = InvisiblePlaywright()
with sf as browser:
    print("seed =", sf.seed)
    # ...

Reproducible fingerprint

with InvisiblePlaywright(seed=42) as browser:
    ...   # same GPU, same canvas hash, same audio context, every run

Proxies

proxy = {
    "server": "socks5://gate.example.com:1080",
    "username": "user",
    "password": "pass",
}
with InvisiblePlaywright(proxy=proxy) as browser:
    ...

Schemes supported: socks5, socks4, http, https. DNS is routed through the proxy by default, no local leak.

Timezone

The browser timezone follows timezone=:

# default: timezone is auto-derived from the egress IP (proxy egress if a
# proxy is set, otherwise the host's own public IP)
with InvisiblePlaywright(proxy=proxy) as browser:
    ...

# explicit IANA zone always wins, the only way to force a specific zone
with InvisiblePlaywright(proxy=proxy, timezone="America/New_York") as browser:
    ...

Pinning specific fingerprint fields

By default everything comes from seed. To force specific values while the rest stays seed-derived:

with InvisiblePlaywright(
    seed=42,
    pin={
        "gpu.renderer": "ANGLE (AMD, Radeon R9 200 Series Direct3D11 vs_5_0 ps_5_0, D3D11)",
        "gpu.vendor":   "Google Inc. (AMD)",
        "screen.width":  2560,
        "screen.height": 1440,
        "hardware.concurrency": 16,
    },
) as browser:
    ...

A GPU pin picks one of the validated personas rather than setting a free string, because the ~81 getParameter values and the extension list travel with the renderer name and a detector cross-checks them against it. A name the pool does not carry raises, and the error lists the ones it does.

Full list of pinnable keys, how pinning interacts with the Bayesian sampler, and common patterns are in docs/pinning.md.

CLI

The installed command is invisible-playwright, with a hyphen. python -m invisible_playwright works identically and needs nothing on PATH.

invisible-playwright fetch    # download the engine if missing, check every cached
                              # one against the seal, print the path
invisible-playwright version  # wrapper, core and engine versions, and where the
                              # engine is cached

Documentation, guides and comparisons

If you would rather prompt than script. This page is the engine, as a Python library. Two ways to use it without writing code, both one line: from an MCP client you already have (Claude Code, Claude Desktop, Cursor), claude mcp add stealth -- uvx aihawk, see the MCP server page; or with an interface and a model included, needing only an OpenRouter key, uvx aihawk ui --openrouter-key sk-or-..., see AIHawk. Same engine underneath, and the second is a client of the first.

All of it reads better, and is searchable, in the wiki, organised into four sections instead of one flat list:

• Documentation - installation, the two-line switch from plain Playwright, proxy/timezone configuration, pinning specific fields, the CLI.
• Guides - how detection actually works, in seven groups: browser identity, canvas/WebGL/fonts/ audio, network and WebRTC, the automation layer, AI agents, the detectors themselves explained from source, and testing.
• Comparisons - against Camoufox, Patchright, nodriver and playwright-stealth, and the case for Firefox over Chromium generally.
• Integrations - Scrapy, Crawlee, Robot Framework, CodeceptJS, test runners, Playwright MCP, and the frameworks it does not fit, by name.

If you don't know where to start: Three ways to make Playwright undetected is the map most other pages link back to, Playwright detected as a bot on one site is the troubleshooting order, and navigator.webdriver is not the tell you think it is explains the most famous property in this space and why patching it alone buys you almost nothing.

The detectors section now covers the commercial anti-bot products by name, each read from its own documentation or from confirmed reverse engineering: Cloudflare Bot Management and Turnstile, DataDome, Kasada, Akamai Bot Manager, PerimeterX, hCaptcha, Imperva, and the rest of the set.

Related projects

The other pieces of this one. The engine is the middle of three, and the two around it are how most people reach it:

• invisible_core - seed to fingerprint to preferences, plus proxy and geolocation. This package pins it.
• AIHawk - this engine as an MCP server (uvx aihawk, for any client that brings its own model) and, in the same package, an interface with a model included, from one command. The interface is a client of the server, with no private path to the browser.

The open-source neighbours. Which one fits depends on the layer your problem is at, and on whether you need Firefox or Chromium: three ways to make Playwright undetected works through what each layer can reach, and AI browser agents and stealth covers the frameworks that pick Chromium over CDP for you.

On the Firefox side

• Camoufox - patches C++ too, wider surface, ships a fingerprint database instead of deriving one from a seed. Comparison.
• LibreWolf - a privacy-defaults Firefox to browse with, not to automate.
• arkenfox/user.js - hardening through preferences. Where a preference is enough, use it.

On the Chromium side

• Patchright - a patched Playwright fork: the work lands in the driver, not the binary. Comparison.
• nodriver - successor to undetected-chromedriver, driving Chrome over CDP. Comparison.
• rebrowser-patches - fixes the Runtime.enable CDP leak. Comparison.
• fingerprint-suite - a Bayesian fingerprint generator, then injected into the page. Comparison.
• playwright-with-fingerprints - values from a paid remote service, Windows-only. Comparison.
• playwright-stealth - an init-script patch; its maintainer calls it a proof-of-concept. Comparison.
• puppeteer-extra-plugin-stealth - the original of that lineage, last substantive commit mid-2024. What that means.
• selenium-stealth - the same approach on Selenium, last commit December 2021. What that means.
• pyppeteer - unmaintained by its own README, which points to playwright-python. What that recommendation is about.

What is patched in the engine

Two rules hold across everything below. Every value is decided before a page can ask, inside the browser, so there is no JavaScript shim to find. And every value comes from one profile, so no two surfaces contradict each other, which is how a spoofed browser is usually caught. Source: feder-cr/firefox_antidetect_patch.

Identity

• navigator, the user agent and the client hints are derived together, so they cannot disagree: does Playwright set navigator.webdriver, client hints and Sec-Fetch.
• navigator.languages and the Accept-Language header are the same declaration, sent and read: Accept-Language and navigator.languages.
• Screen geometry, devicePixelRatio and the media queries exposing it are declared, not read from the host: devicePixelRatio and the Firefox pref, CSS media query fingerprinting.

Rendering

• Canvas readback is deterministic per seed and keeps the real shape, rather than blocked or noised: canvas fingerprint noise, why a canvas fingerprint changes every run.
• WebGL reports a coherent GPU persona: vendor, renderer and the parameter limits are cross-checked, not set one at a time: WebGL renderer strings, WebGL parameters are identical.
• Fonts ship with the browser, so the same faces exist on every host and the platform font engine no longer chooses: bundled fonts across platforms, why headless browsers render different fonts, detecting installed fonts from JavaScript.
• Text metrics follow those fonts: measureText returns ten-plus numbers from one call, with no permission prompt: measureText and TextMetrics.
• Canvas and WebGL agree across operating systems for the same seed: cross-platform consistency, canvas differs across operating systems.

Audio and media

• The audio stack answers from the profile rather than from the host device: AudioContext fingerprinting, sample rate and latency.
• The codec table is declared, so a Linux host does not answer a Windows question with Linux support: codec fingerprinting.

Network

• WebRTC offers one synthetic candidate carrying the proxy exit, instead of leaking the real address or offering none, which is itself a tell: WebRTC ICE candidate spoofing, does the WebRTC IP match the proxy exit.
• DNS resolves through the proxy, including when the proxy is not in the preferences: does a proxy leak DNS, how to check for a proxy IP leak.
• The timezone comes from the egress IP, resolved offline, so it matches the exit: timezone and proxy mismatch, offline GeoIP timezone.

The automation layer

• Input events come from the real input path, so isTrusted is true because it is true: Playwright clicks and isTrusted.
• The pointer follows a human path and timing, at a cadence a real device could produce: human mouse movement, mouse dynamics as behavioural biometrics.
• The debugger surface does not answer the timing questions that give a driven browser away: debugger timing detection.
• Closed-mode shadow roots are reachable, which stock Playwright cannot do in either engine, while the page still reads null: closed shadow roots.

License

MIT - see LICENSE. The patched Firefox binary is distributed under the MPL-2.0 (Firefox upstream license). The C++ patches against mozilla-central that produce that binary are at feder-cr/firefox_antidetect_patch.

Disclaimer

This project is for educational purposes only. It is provided as-is, with no warranties. I take no responsibility for how it is used. Use it at your own risk and in compliance with the laws of your jurisdiction.

Built by Federico Elia