Solve reCAPTCHA Invisible with Python and CaptchaAI

Invisible reCAPTCHA v2 runs silently in the background — there is no checkbox for the user to click. It triggers on form submission or button click and only shows a challenge if it suspects bot activity. The key difference from standard reCAPTCHA v2: you must include the invisible=1 flag when submitting to CaptchaAI.

Prerequisites

Item	Value
CaptchaAI API key	From captchaai.com
Python	3.7+
Libraries	`requests`, `selenium`

How to identify invisible reCAPTCHA

Look for these signs in the page source:

data-size="invisible" on the reCAPTCHA div
The reCAPTCHA element is positioned off-screen (top: -10000px)
grecaptcha.execute() is called programmatically on form submit

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

driver = webdriver.Chrome()
driver.get("https://example.com/login")

# Check for invisible reCAPTCHA
recaptcha_div = driver.find_element(By.CSS_SELECTOR, ".g-recaptcha")
site_key = recaptcha_div.get_attribute("data-sitekey")
is_invisible = recaptcha_div.get_attribute("data-size") == "invisible"
print(f"Site key: {site_key}, Invisible: {is_invisible}")

Step 1: Get the site key

# The site key is in data-sitekey or in the reCAPTCHA script URL
site_key = driver.find_element(
    By.CSS_SELECTOR, "[data-sitekey]"
).get_attribute("data-sitekey")
page_url = driver.current_url

Step 2: Submit to CaptchaAI with invisible=1

The invisible=1 parameter is required — omitting it may cause failed solves.

import requests
import time

API_KEY = "YOUR_API_KEY"

response = requests.get("https://ocr.captchaai.com/in.php", params={
    "key": API_KEY,
    "method": "userrecaptcha",
    "googlekey": site_key,
    "pageurl": page_url,
    "invisible": 1,
    "json": 1,
})
result = response.json()

if result["status"] != 1:
    raise Exception(f"Submit failed: {result['request']}")

task_id = result["request"]
print(f"Task submitted: {task_id}")

Step 3: Poll for the token

time.sleep(15)

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["status"] == 1:
        token = result["request"]
        print(f"Token: {token[:50]}...")
        break

    if result["request"] != "CAPCHA_NOT_READY":
        raise Exception(f"Error: {result['request']}")

    time.sleep(5)

Step 4: Inject the token and trigger the action

Invisible reCAPTCHA often validates only when the protected action occurs. Inject the token before triggering.

# Method A: Standard injection
driver.execute_script(
    f'document.getElementById("g-recaptcha-response").innerHTML = "{token}";'
)

# Method B: If the site uses a callback
callback_name = driver.execute_script(
    'return document.querySelector("[data-callback]")?.getAttribute("data-callback")'
)
if callback_name:
    driver.execute_script(f'{callback_name}("{token}")')

# Submit the form
driver.find_element(By.CSS_SELECTOR, "form").submit()
print("Form submitted with solved token")

Complete working example

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

API_KEY = "YOUR_API_KEY"

# 1. Load page and get site key
driver = webdriver.Chrome()
driver.get("https://example.com/login")
site_key = driver.find_element(By.CSS_SELECTOR, "[data-sitekey]").get_attribute("data-sitekey")

# 2. Submit to CaptchaAI with invisible flag
submit = requests.get("https://ocr.captchaai.com/in.php", params={
    "key": API_KEY, "method": "userrecaptcha", "googlekey": site_key,
    "pageurl": driver.current_url, "invisible": 1, "json": 1
}).json()
task_id = submit["request"]

# 3. Poll for token
time.sleep(15)
for _ in range(30):
    poll = requests.get("https://ocr.captchaai.com/res.php", params={
        "key": API_KEY, "action": "get", "id": task_id, "json": 1
    }).json()
    if poll["status"] == 1:
        token = poll["request"]
        break
    if poll["request"] != "CAPCHA_NOT_READY":
        raise Exception(poll["request"])
    time.sleep(5)

# 4. Inject and submit
driver.execute_script(f'document.getElementById("g-recaptcha-response").innerHTML = "{token}";')
driver.find_element(By.CSS_SELECTOR, "form").submit()
print("Login submitted with invisible reCAPTCHA solved")
driver.quit()

FAQ

What's the difference between invisible and standard reCAPTCHA v2?

Standard shows a checkbox. Invisible runs silently — it only presents a challenge if it suspects automation. The solving process is similar but requires invisible=1 in the API call.