Cookie Defense

Cookie Defense analyzes the cookies on the current site (or across your whole browser) and replaces the values of identified tracking/advertising cookies with random, format-valid fake data — the site keeps working normally, but the profile advertisers build from that cookie becomes worthless. Why this is different from other cookie tools: most cookie blockers delete cookies or prevent them from being set, which often breaks site functionality (login, shopping cart). Cookie Defense leaves the cookie in place — only the value becomes useless random data. Features: • Detects 2,000+ tracking cookies (Google, Meta, Criteo, TikTok, RTB House, and dozens more) • Adjustable aggressiveness level (1–5): how aggressively unknown cookies are treated by default • Format-valid fake data (UUID, JSON, JWT, GA client ID, etc.) that passes the tracker's own validation • Backup and restore if obfuscation ever breaks a site • Downloadable Markdown reports of a site's tracking footprint • Login and session cookies are always detected and left untouched • Runs entirely locally — no data is ever sent anywhere • Available in Finnish and English Privacy policy: https://salolabs.github.io/cookie-defense/ Source code (open source): https://github.com/Salolabs/cookie-defense