CyberGuard - Online Privacy & Security Protection

Free online security scanner. Detects network threats, unsecured WiFi, trackers, and AI risks. No ads, no tracking, no paywalls.

CyberGuard keeps you safe online without collecting your data, showing ads, or locking features behind a paywall. It's completely free. We built CyberGuard because online security tools are either too complicated or too expensive. This extension runs security checks on your network and browser to catch threats before they become problems. When something looks risky, you get a straightforward alert with clear steps to fix it. Everything runs locally on your device. We don't track what you do, store your data, or sell your information. Your privacy is yours. We believe security shouldn't be a luxury. Download CyberGuard today and browse with confidence. 🌟 Key Features 🔐 Real-Time Threat Detection Scans for common cyber risks like unsecured WiFi, MITM attacks, DNS hijacking, ARP spoofing, port scans, WebRTC IP leaks, HTTPS connection status, TLS certificate validation, and open ports on your network. 📡 WiFi & Network Safety Automatically checks for insecure or fake public WiFi networks that could compromise your data. Verifies VPN and proxy connections to ensure you're truly protected. 🕵️‍♂️ Tracker & Fingerprinting Blocker Blocks ad trackers, cross-site cookies, and fingerprinting scripts to protect your identity online. Monitors clipboard access and detects JavaScript injection attempts. 🤖 AI Security & API Protection Warns you if websites have exposed AI keys from OpenAI, Anthropic, Google AI, and other providers. 🔍 AI Traffic Monitoring Spots suspicious activity when you use ChatGPT, Claude, and similar tools. Blocks cross-origin injection attempts targeting AI applications. 🚨 Sensitive Data Alerts Warns you before submitting personal info to AI services. Scans input fields for sensitive data like passwords, credit cards, and personal identifiers. 📁 File Privacy Scanner Checks files for location data and personal details before upload. Detects metadata that could expose your privacy when sharing documents. 🛡️ Session Protection Guards your conversations on AI platforms from hijacking attempts. Protects against session theft on ChatGPT, Claude, Gemini, and other AI services. ⚔️ Prompt Injection Defense Protects against malicious prompts trying to manipulate AI tools with optional LockLLM integration for advanced AI security scanning. 🎥 Webcam & Mic Monitoring Get notified if any site attempts to access your webcam or microphone without your knowledge. ⚡ One-Click Scan with Smart Alerts Quickly check your current connection for vulnerabilities and get easy-to-follow fix suggestions, no tech skills needed. Most scans finish in under 5 seconds. 📊 Performance Tools Built-in internet speed test and connection quality monitoring to help you understand your network performance. ☁️ Sync Across Devices Save your security preferences via Chrome Sync, totally private, no personal data shared. 🎁 Free Forever No subscriptions. No upgrades. No ads. Completely free. 🛡️ Why Choose CyberGuard? 1. Zero Data Collection We don't track your browsing, collect your information, or send data to any servers. All security checks run on your device. The only time data leaves your browser is when you use the optional LockLLM integration, and that's only the text you're scanning, nothing else. 2. Built for Everyday Users CyberGuard is simple, intuitive, and doesn't require any technical knowledge to use or understand. Clear explanations and actionable steps for every alert. 3. Detects More Than Just Ads Unlike basic blockers, CyberGuard scans your network environment and browser activity for real cyber threats including MITM attacks, DNS hijacking, and AI-specific vulnerabilities. 4. Fast & Lightweight Optimized for performance so your browsing stays fast and smooth, with no lag or heavy memory use. Uses minimal resources and won't slow down your browser. 5. Transparent & Trustworthy Open about what we do and what we don't. No dark patterns, trackers, or sketchy upsells. No analytics, no tracking pixels, no "anonymized" data collection. 📈 Perfect For: - Remote workers who connect to public WiFi - Privacy-conscious users who want more than just ad blocking - Developers and security researchers testing systems - Students on university networks - AI users who want to protect their prompts and API keys - Anyone who wants straightforward protection without technical knowledge or paying for subscriptions 📥 Get Started 1. Install CyberGuard 2. Click the icon and hit Scan 3. Review any alerts and follow the fix steps 4. (Optional) Add your LockLLM API key in Settings for AI security features That's it. No account required, no setup wizard, no tutorial videos. 🆕 What's New in v1.2.0 AI Security Features We added a full suite of AI-specific security checks: • Detects exposed API keys for OpenAI, Anthropic, Google AI, and other providers • Monitors AI platform traffic for suspicious patterns • Scans for sensitive data in input fields before you submit • Browser AI Guard integration with LockLLM API for real-time prompt injection detection • Protects against session hijacking on ChatGPT, Claude, Gemini, and other AI platforms • Blocks cross-origin prompt injection attempts Enhanced Privacy • File metadata scanner warns about location data and personal info in uploads • Improved clipboard protection • Better fingerprinting detection UI Improvements • Cleaner settings interface with organized sections • API key configuration for LockLLM integration • Real-time connection testing • Better error messages and status indicators 🔗 Need More? • Email: support@lockllm.com • Made by LockLLM: https://www.lockllm.com Download CyberGuard today and browse with confidence.