Undetected ChromeDriver with CaptchaAI Integration

undetected-chromedriver is a Python library that patches Selenium's ChromeDriver to reduce bot detection signals. It handles Chrome version matching, removes navigator.webdriver flags, and modifies other browser fingerprints that sites check. When a site still presents a CAPTCHA despite stealth measures, CaptchaAI solves it and returns a token you inject into the page.

This guide shows how to combine both tools — use undetected-chromedriver for stealth browsing and CaptchaAI for any CAPTCHAs that still appear.

What you need

Install dependencies:

pip install undetected-chromedriver requests

Basic setup

import undetected_chromedriver as uc
import requests
import time


def create_stealth_browser():
    """Create an undetected Chrome browser instance."""
    options = uc.ChromeOptions()
    options.add_argument("--no-sandbox")
    options.add_argument("--window-size=1920,1080")

    driver = uc.Chrome(options=options)
    return driver

Solving reCAPTCHA v2 in a stealth session

Step 1: Navigate and extract the sitekey

API_KEY = "YOUR_API_KEY"


def extract_recaptcha_sitekey(driver):
    """Extract reCAPTCHA v2 sitekey from the page."""
    try:
        element = driver.find_element("css selector", "[data-sitekey]")
        return element.get_attribute("data-sitekey")
    except Exception:
        # Try finding in iframe src
        iframes = driver.find_elements("css selector", "iframe[src*='recaptcha']")
        for iframe in iframes:
            src = iframe.get_attribute("src")
            if "k=" in src:
                return src.split("k=")[1].split("&")[0]
    return None

Step 2: Solve with CaptchaAI

def solve_recaptcha_v2(sitekey, pageurl):
    """Submit reCAPTCHA v2 to CaptchaAI and return the token."""
    submit = requests.post("https://ocr.captchaai.com/in.php", data={
        "key": API_KEY,
        "method": "userrecaptcha",
        "googlekey": sitekey,
        "pageurl": pageurl,
        "json": 1
    }).json()

    if submit.get("status") != 1:
        raise RuntimeError(f"Submit error: {submit.get('request')}")

    task_id = submit["request"]

    time.sleep(20)
    for _ in range(30):
        result = requests.get("https://ocr.captchaai.com/res.php", params={
            "key": API_KEY, "action": "get", "id": task_id, "json": 1
        }).json()

        if result.get("status") == 1:
            return result["request"]
        if result.get("request") != "CAPCHA_NOT_READY":
            raise RuntimeError(f"Solve error: {result['request']}")
        time.sleep(5)

    raise TimeoutError("Solve timed out")

Step 3: Inject the token and submit

def inject_recaptcha_token(driver, token):
    """Inject the solved token into the page and submit."""
    driver.execute_script(f'''
        document.getElementById("g-recaptcha-response").innerHTML = "{token}";
        document.getElementById("g-recaptcha-response").style.display = "block";
    ''')

    # If there's a callback function, trigger it
    driver.execute_script(f'''
        if (typeof ___grecaptcha_cfg !== 'undefined') {{
            var clients = ___grecaptcha_cfg.clients;
            for (var key in clients) {{
                var client = clients[key];
                if (client && client.callback) {{
                    client.callback("{token}");
                }}
            }}
        }}
    ''')

Complete workflow: Login with reCAPTCHA

import undetected_chromedriver as uc
import requests
import time

API_KEY = "YOUR_API_KEY"


def solve_recaptcha(sitekey, pageurl):
    submit = requests.post("https://ocr.captchaai.com/in.php", data={
        "key": API_KEY, "method": "userrecaptcha",
        "googlekey": sitekey, "pageurl": pageurl, "json": 1
    }).json()

    if submit.get("status") != 1:
        raise RuntimeError(f"Submit error: {submit.get('request')}")

    task_id = submit["request"]
    time.sleep(20)

    for _ in range(30):
        result = requests.get("https://ocr.captchaai.com/res.php", params={
            "key": API_KEY, "action": "get", "id": task_id, "json": 1
        }).json()
        if result.get("status") == 1:
            return result["request"]
        if result.get("request") != "CAPCHA_NOT_READY":
            raise RuntimeError(f"Solve error: {result['request']}")
        time.sleep(5)
    raise TimeoutError("Solve timed out")


def main():
    driver = uc.Chrome()

    try:
        # Navigate to target page
        driver.get("https://example.com/login")
        time.sleep(3)

        # Fill in form fields
        driver.find_element("id", "username").send_keys("user")
        driver.find_element("id", "password").send_keys("pass")

        # Extract sitekey
        element = driver.find_element("css selector", "[data-sitekey]")
        sitekey = element.get_attribute("data-sitekey")
        pageurl = driver.current_url
        print(f"Sitekey: {sitekey}")

        # Solve CAPTCHA
        token = solve_recaptcha(sitekey, pageurl)
        print(f"Token: {token[:50]}...")

        # Inject token
        driver.execute_script(
            f'document.getElementById("g-recaptcha-response").innerHTML = "{token}";'
        )

        # Submit form
        driver.find_element("id", "submit-btn").click()
        time.sleep(3)

        print(f"Current URL: {driver.current_url}")
    finally:
        driver.quit()


if __name__ == "__main__":
    main()

Solving Cloudflare Turnstile

For sites with Cloudflare Turnstile widgets, extract the sitekey and solve via the Turnstile method:

def solve_turnstile(sitekey, pageurl):
    submit = requests.post("https://ocr.captchaai.com/in.php", data={
        "key": API_KEY, "method": "turnstile",
        "sitekey": sitekey, "pageurl": pageurl, "json": 1
    }).json()

    if submit.get("status") != 1:
        raise RuntimeError(f"Submit error: {submit.get('request')}")

    task_id = submit["request"]
    time.sleep(10)

    for _ in range(30):
        result = requests.get("https://ocr.captchaai.com/res.php", params={
            "key": API_KEY, "action": "get", "id": task_id, "json": 1
        }).json()
        if result.get("status") == 1:
            return result["request"]
        if result.get("request") != "CAPCHA_NOT_READY":
            raise RuntimeError(f"Solve error: {result['request']}")
        time.sleep(5)
    raise TimeoutError("Solve timed out")


# Inject Turnstile token
def inject_turnstile_token(driver, token):
    driver.execute_script(f'''
        var input = document.querySelector('[name="cf-turnstile-response"]');
        if (input) input.value = "{token}";
    ''')

Troubleshooting

FAQ

Why use undetected-chromedriver with CaptchaAI?

Undetected-chromedriver reduces bot detection signals so fewer CAPTCHAs appear. When CAPTCHAs still trigger, CaptchaAI solves them. The combination gives the highest success rate.

Does undetected-chromedriver work in headless mode?

Yes, but headless mode may trigger more CAPTCHAs. Use options.add_argument("--headless=new") for Chrome's new headless mode.

Can I use this with Selenium Grid?

Yes, but undetected-chromedriver needs to patch the local driver binary. For distributed setups, pre-patch the driver on each node.

What if the site detects automation despite UC?

Some sites use advanced detection beyond what UC patches. CaptchaAI handles the resulting CAPTCHAs regardless of detection method.

Add CaptchaAI to your browser automation

Get your API key at captchaai.com. Combine stealth browsing with reliable CAPTCHA solving.

Related guides

• How to Solve reCAPTCHA v2 Using API
• How to Solve Cloudflare Turnstile Using API
• Puppeteer Stealth + CaptchaAI
• Headless vs Headed Chrome for CAPTCHA Solving