Handling Multiple CAPTCHAs on a Single Page

Some pages render two or more CAPTCHAs — a login form with reCAPTCHA and a newsletter signup with a second reCAPTCHA, or a multi-step form where each step triggers its own challenge. Each CAPTCHA has a unique sitekey and target element, so you need to detect all of them, solve them in parallel, and inject each token into the correct callback.

Detecting multiple CAPTCHAs

Python with Selenium

from selenium import webdriver
from selenium.webdriver.common.by import By

driver = webdriver.Chrome()
driver.get("https://example.com/multi-captcha-page")

# Find all reCAPTCHA iframes
captcha_iframes = driver.find_elements(
    By.CSS_SELECTOR, 'iframe[src*="recaptcha/api2/anchor"]'
)

# Extract sitekeys from each iframe's src
import re
captchas = []
for i, iframe in enumerate(captcha_iframes):
    src = iframe.get_attribute("src")
    match = re.search(r"k=([A-Za-z0-9_-]+)", src)
    if match:
        captchas.append({
            "index": i,
            "sitekey": match.group(1),
            "iframe": iframe
        })

print(f"Found {len(captchas)} CAPTCHAs on page")
for c in captchas:
    print(f"  [{c['index']}] sitekey: {c['sitekey']}")

Expected output:

Found 2 CAPTCHAs on page
  [0] sitekey: 6LcXyzABCDEF-login
  [1] sitekey: 6LcAbcDEFGHI-signup

JavaScript with Puppeteer

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch({ headless: false });
  const page = await browser.newPage();
  await page.goto('https://example.com/multi-captcha-page', {
    waitUntil: 'networkidle2'
  });

  // Extract all reCAPTCHA widgets from the page
  const captchas = await page.evaluate(() => {
    const widgets = document.querySelectorAll('.g-recaptcha');
    return Array.from(widgets).map((el, i) => ({
      index: i,
      sitekey: el.getAttribute('data-sitekey'),
      elementId: el.id || `captcha-${i}`,
      callbackName: el.getAttribute('data-callback') || null
    }));
  });

  console.log(`Found ${captchas.length} CAPTCHAs`);
  captchas.forEach(c => console.log(`  [${c.index}] ${c.sitekey}`));
})();

Solving all CAPTCHAs in parallel

Submit all CAPTCHAs to CaptchaAI at once, then poll until each resolves.

Python

import requests
import time
from concurrent.futures import ThreadPoolExecutor, as_completed

API_KEY = "YOUR_API_KEY"
PAGE_URL = "https://example.com/multi-captcha-page"

def submit_captcha(sitekey):
    resp = requests.post("https://ocr.captchaai.com/in.php", data={
        "key": API_KEY,
        "method": "userrecaptcha",
        "googlekey": sitekey,
        "pageurl": PAGE_URL,
        "json": "1"
    })
    result = resp.json()
    if result["status"] != 1:
        raise Exception(f"Submit error: {result['request']}")
    return result["request"]

def poll_result(task_id, timeout=120):
    deadline = time.time() + timeout
    while time.time() < deadline:
        time.sleep(5)
        resp = requests.get("https://ocr.captchaai.com/res.php", params={
            "key": API_KEY,
            "action": "get",
            "id": task_id,
            "json": "1"
        })
        result = resp.json()
        if result["status"] == 1:
            return result["request"]
        if result["request"] != "CAPCHA_NOT_READY":
            raise Exception(f"Poll error: {result['request']}")
    raise TimeoutError(f"Task {task_id} timed out")

def solve_all(captchas):
    # Submit all in parallel
    task_ids = {}
    with ThreadPoolExecutor(max_workers=len(captchas)) as pool:
        futures = {
            pool.submit(submit_captcha, c["sitekey"]): c["index"]
            for c in captchas
        }
        for future in as_completed(futures):
            idx = futures[future]
            task_ids[idx] = future.result()
            print(f"[captcha-{idx}] Submitted → task {task_ids[idx]}")

    # Poll all in parallel
    tokens = {}
    with ThreadPoolExecutor(max_workers=len(task_ids)) as pool:
        futures = {
            pool.submit(poll_result, tid): idx
            for idx, tid in task_ids.items()
        }
        for future in as_completed(futures):
            idx = futures[future]
            tokens[idx] = future.result()
            print(f"[captcha-{idx}] Solved")

    return tokens

# Example usage
captchas = [
    {"index": 0, "sitekey": "6LcXyzABCDEF-login"},
    {"index": 1, "sitekey": "6LcAbcDEFGHI-signup"}
]

tokens = solve_all(captchas)

Expected output:

[captcha-0] Submitted → task 71823456
[captcha-1] Submitted → task 71823457
[captcha-1] Solved
[captcha-0] Solved

Each reCAPTCHA widget has its own g-recaptcha-response textarea. When multiple widgets exist, each textarea is nested inside its widget container.

Python (Selenium)

def inject_tokens(driver, captchas, tokens):
    for c in captchas:
        idx = c["index"]
        token = tokens[idx]

        # Find the textarea within the widget's container
        container = driver.find_elements(By.CSS_SELECTOR, ".g-recaptcha")[idx]
        textarea = container.find_element(
            By.CSS_SELECTOR, 'textarea[name="g-recaptcha-response"]'
        )
        driver.execute_script(
            "arguments[0].value = arguments[1];", textarea, token
        )

        # Trigger the callback if defined
        callback = c.get("callback")
        if callback:
            driver.execute_script(f"{callback}('{token}');")

        print(f"[captcha-{idx}] Token injected")

inject_tokens(driver, captchas, tokens)

JavaScript (Puppeteer)

async function injectTokens(page, captchas, tokens) {
  for (const captcha of captchas) {
    const token = tokens[captcha.index];

    await page.evaluate((idx, tkn, callbackName) => {
      const widgets = document.querySelectorAll('.g-recaptcha');
      const textarea = widgets[idx].querySelector(
        'textarea[name="g-recaptcha-response"]'
      );
      textarea.value = tkn;

      if (callbackName && typeof window[callbackName] === 'function') {
        window[callbackName](tkn);
      }
    }, captcha.index, token, captcha.callbackName);

    console.log(`[captcha-${captcha.index}] Token injected`);
  }
}

await injectTokens(page, captchas, tokens);

Mixed CAPTCHA types

When a page has different CAPTCHA types (e.g., reCAPTCHA + Turnstile), detect each type separately:

def detect_all_captchas(driver):
    detected = []

    # reCAPTCHA
    recaptchas = driver.find_elements(By.CSS_SELECTOR, ".g-recaptcha")
    for i, el in enumerate(recaptchas):
        detected.append({
            "type": "userrecaptcha",
            "sitekey": el.get_attribute("data-sitekey"),
            "label": f"recaptcha-{i}"
        })

    # Turnstile
    turnstiles = driver.find_elements(By.CSS_SELECTOR, ".cf-turnstile")
    for i, el in enumerate(turnstiles):
        detected.append({
            "type": "turnstile",
            "sitekey": el.get_attribute("data-sitekey"),
            "label": f"turnstile-{i}"
        })

    return detected

Submit each with its matching method parameter — userrecaptcha for reCAPTCHA, turnstile for Turnstile.

Troubleshooting

Problem	Cause	Fix
Token injected but form still blocked	Callback not triggered	Check `data-callback` and call it with the token
Only first CAPTCHA detected	Second CAPTCHA loads lazily	Wait for all iframes/widgets to appear before scanning
Wrong token in wrong widget	Index mismatch	Map tokens to sitekeys, not positional index
`ERROR_WRONG_GOOGLEKEY`	Sitekey extracted incorrectly	Verify sitekey from iframe `src` or `data-sitekey` attribute

FAQ

Can a page have different sitekeys for each CAPTCHA?

Yes. Each widget can use a separate sitekey. Always extract the sitekey per widget rather than assuming they share one.

Should I solve them sequentially or in parallel?

In parallel. Each solve takes 15-30 seconds. Solving two CAPTCHAs in parallel takes the same time as solving one.

What if the second CAPTCHA only appears after submitting the first form?

Re-scan the page after each form submission to detect newly rendered CAPTCHAs. Use WebDriverWait (Selenium) or page.waitForSelector (Puppeteer) to wait for the new widget.