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mamangwarkop
mamangwarkop

Posted on Originally published at github.com

How to detect if a website runs Meta Pixel, TikTok Pixel or Google Tag Manager with plain Python

#python #webdev #tutorial #marketing

Agencies and freelancers lose hours opening DevTools on prospect sites. You can automate it in 20 lines because every pixel leaves a fingerprint in the HTML.

import urllib.request

SIGNS = {
    "Meta Pixel": ("connect.facebook.net", "fbq("),
    "TikTok Pixel": ("analytics.tiktok.com", "ttq."),
    "Google Tag Manager": ("googletagmanager.com/gtm.js",),
    "GA4": ("gtag(", "google-analytics.com"),
}

def audit(url):
    req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
    html = urllib.request.urlopen(req, timeout=10).read().decode("utf-8", "replace").lower()
    return {name: any(s in html for s in sigs) for name, sigs in SIGNS.items()}

print(audit("https://example.com"))
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Limits to know

  • Pixels injected only after consent or via server-side tagging will not show up in raw HTML. Treat "missing" as "not detected", not as proof.
  • Single-page apps may load tags late. For those, use a headless browser.

Doing it for 1,000 domains

Run this with concurrency and add email, WhatsApp and social extraction, plus a 0-100 lead score and a ready pitch sentence. I packaged exactly that as an Apify Actor: https://apify.com/mamang_warkop/b2b-website-contact-and-pixel-lead-enricher (open-source repo: https://github.com/mamangwarkop/b2b-website-contact-and-pixel-lead-enricher).

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