Captcha Solver for Selenium
Automatically solve and fill image captchas in your Selenium scripts. FastCaptcha solves in 0.3 seconds — screenshot the captcha, get the answer, fill the field. Full Python and Node.js examples included.
How Captcha Solving Works in Selenium
3 simple steps — from captcha detection to form submission
1. Screenshot the Captcha
Locate the captcha image element with Selenium's find_element() and take a screenshot of just that element.
2. Solve in 0.3 Seconds
POST the image to FastCaptcha's API. AI returns the solved text in 0.3–0.7 seconds — no polling, no waiting.
3. Fill & Submit
Type the solved text into the captcha input field with send_keys() and submit the form. Done.
Selenium Captcha Solver Code Examples
Python Selenium (Basic)
from selenium import webdriver
from selenium.webdriver.common.by import By
import requests
def solve_captcha(image_path, api_key):
"""Solve captcha image via FastCaptcha API."""
res = requests.post(
"https://fastcaptcha.org/api/v1/ocr/",
headers={"X-API-Key": api_key},
files={"image": open(image_path, "rb")}
)
return res.json()["text"]
# Setup Selenium
driver = webdriver.Chrome()
driver.get("https://example.com/login")
# Find and screenshot captcha
captcha_img = driver.find_element(By.ID, "captcha-image")
captcha_img.screenshot("captcha.png")
# Solve (0.3 seconds)
API_KEY = "YOUR_FASTCAPTCHA_KEY"
solution = solve_captcha("captcha.png", API_KEY)
# Fill in captcha field and submit
driver.find_element(By.ID, "captcha-input").send_keys(solution)
driver.find_element(By.ID, "submit-btn").click()Python Selenium (Production-Ready)
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import requests, time
class SeleniumCaptchaSolver:
def __init__(self, api_key):
self.api_key = api_key
self.endpoint = "https://fastcaptcha.org/api/v1/ocr/"
def solve(self, driver, captcha_selector, input_selector, retries=2):
"""Find captcha, solve it, fill the input field."""
wait = WebDriverWait(driver, 10)
captcha_el = wait.until(EC.visibility_of_element_located(
(By.CSS_SELECTOR, captcha_selector)
))
for attempt in range(retries + 1):
captcha_el.screenshot("captcha.png")
res = requests.post(
self.endpoint,
headers={"X-API-Key": self.api_key},
files={"image": open("captcha.png","rb")},
timeout=10
)
if res.ok:
solution = res.json()["text"]
input_el = driver.find_element(
By.CSS_SELECTOR, input_selector
)
input_el.clear()
input_el.send_keys(solution)
return solution
time.sleep(1)
raise Exception("Captcha solving failed after retries")
# Usage
solver = SeleniumCaptchaSolver("YOUR_API_KEY")
driver = webdriver.Chrome()
driver.get("https://example.com/login")
solver.solve(driver, "#captcha-img", "#captcha-input")
driver.find_element(By.ID, "submit").click()Node.js Selenium (selenium-webdriver)
const { Builder, By, until } = require('selenium-webdriver');
const axios = require('axios');
const FormData = require('form-data');
const fs = require('fs');
async function solveCaptchaSelenium() {
const driver = await new Builder()
.forBrowser('chrome').build();
await driver.get('https://example.com/login');
// Find captcha image element
const captchaEl = await driver.wait(
until.elementLocated(By.id('captcha-image')), 10000
);
// Screenshot captcha element
const img64 = await captchaEl.takeScreenshot();
fs.writeFileSync('captcha.png', img64, 'base64'); // Solve with FastCaptcha (0.3s)
const form = new FormData();
form.append('image', fs.createReadStream('captcha.png'));
const { data } = await axios.post(
'https://fastcaptcha.org/api/v1/ocr/',
form,
{ headers: {
'X-API-Key': 'YOUR_KEY',
...form.getHeaders()
}}
);
// Fill captcha input and submit
const input = await driver.findElement(By.id('captcha-input'));
await input.sendKeys(data.text);
await driver.findElement(By.id('submit')).click();
await driver.quit();
}
solveCaptchaSelenium();Selenium Captcha Solving Tips
Screenshot Only the Captcha Element
Use element.screenshot() instead of full-page screenshots. This gives FastCaptcha a clean, cropped captcha image for best accuracy.
Wait for Element Visibility
Use WebDriverWait to ensure the captcha image is fully loaded before screenshotting. A half-loaded image reduces accuracy.
Retry Logic
Some sites refresh the captcha after a wrong answer. Implement a retry loop that re-screenshots and re-solves if the form submission fails.
Total Time Under 1.5s
Screenshot (~0.3s) + FastCaptcha solve (~0.4s) + fill + click = under 1.5 seconds total. Far better than any human-based service.
Add Captcha Solving to Your Selenium Script
Free API key. 100 credits. Copy-paste ready code above.