PyPasser

Free, open-source CAPTCHA solver & anti-bot bypass library for Python.
No paid APIs • No third-party subscription keys • Pure HTTP & Browser automation

What is PyPasser?

PyPasser is a modern Python library designed to solve CAPTCHAs and clear anti-bot interstitial challenges. Its primary strength lies in solving headless, pure HTTP challenges — such as reCAPTCHA V3, GeeTest V4, and Lemin Cropped — without launching a browser or running a JavaScript engine.

For visual, audio, or browser-bound challenges (reCAPTCHA V2, Cloudflare Turnstile, Cloudflare Interstitials), PyPasser provides high-level browser automation integrations with built-in stealth engine support.

Every solver in PyPasser exposes both synchronous (solve()) and asynchronous (asolve()) interfaces and returns a standardized SolverResult.

Solvers & Capabilities

Target	Category	Method	Browser Needed?	Free / Local?
reCAPTCHA V3	CAPTCHA	Pure HTTP token forge or DOM hook	No	Yes
reCAPTCHA V2	CAPTCHA	Audio challenge + local Vosk ASR	Yes	Yes
GeeTest V4	CAPTCHA	Pure HTTP (all 8 risk types + voice fallback)	No	Yes
Lemin Cropped	CAPTCHA	Pure HTTP + local Computer Vision	No	Yes
Cloudflare Turnstile	CAPTCHA	Checkbox interaction + token poller	Yes	Yes
ARCaptcha	CAPTCHA	Pure HTTP (puzzle CV + Persian voice ASR)	No	Yes
Cloudflare Interstitial	Anti-Bot	Headed stealth browser + cookie extraction	Yes	Yes
ArvanCloud Interstitial	Anti-Bot	Pure HTTP JSFuck challenge decoder	No	Yes

Quick Example (Pure HTTP)

Solve reCAPTCHA V3, GeeTest V4, or Lemin Cropped challenges in a few seconds without opening a browser:

reCAPTCHA V3 (HTTP)GeeTest V4 (HTTP)Lemin Cropped (HTTP)

from pypasser.captcha import recaptcha

result = recaptcha.v3.solve(
    anchor_url="https://www.google.com/recaptcha/api2/anchor?ar=1&k=...&co=..."
)

if result.is_solved:
    print("g-recaptcha-response:", result.response_token)

from pypasser.captcha import geetest

# Auto-detects whether the site serves slide, ai, match, voice, etc.
result = geetest.v4.solve(
    captcha_id="54088bb07d2df3c46b79f80300b0abbe",
    risk_type="auto",
)

if result.is_solved:
    print("GeeTest seccode JSON:", result.response_token)

from pypasser.captcha import lemin

result = lemin.solve(
    captcha_id="CROPPED_3dfdd5c_d1872b526b794d83ba3b365eb15a200b",
    domain="https://2captcha.com",
)

if result.is_solved:
    print("Pre-validation token:", result.response_token["pv_token"])
    print("Answer payload:", result.response_token["answer"])
    print("Challenge ID:", result.response_token["challenge_id"])

Key Highlights

Zero Cost: Eliminates costly third-party CAPTCHA solving services (2Captcha, Anti-Captcha, CapSolver).
Headless HTTP First: Whenever mathematically possible, challenges are solved via direct wire protocols.
Stealth Browser Support: Native support for Patchright, Playwright, and Camoufox to beat browser fingerprinting.
Offline Machine Learning: Uses local computer vision (Canny edge detection, template correlation) and offline speech recognition (Vosk).