Bryan McGuire
Web development Privacy-respecting tools Network diagnostics
Bryan McGuire is the founder of AI-Regenesis Ltd and the engineer behind ToolPage.dev. He has spent two decades building web tools and business systems, and started ToolPage because he was tired of utility sites that hid the tool below three popups and an interstitial. Every tool here is one he uses himself: an IP checker before spinning up firewall rules, a JSON formatter when a deploy returns 200 with garbage in the body, a mic test before every client call. He writes the guides himself; they're the explanation he'd have wanted the first time he hit each of these problems.
Around the web
Guides by Bryan
- What does your IP address actually reveal about you?
- How DNS records work — A, AAAA, MX, TXT, and CNAME in plain English
- UUID v1, v4, v7, v8: which version should you use?
- Why your JSON is invalid: a field guide to common parse errors
- Reading ping results: latency, jitter, and packet loss explained
- Why every speed test gives you a different number
- User-agent strings vs. Client Hints: the modern way browsers identify themselves
- Pixels, viewports, and device pixel ratio: what each one actually measures
- Why your microphone works in one app but not another
- Webcam permissions, indicators, and privacy — what each browser does differently
- How password strength is actually measured (and why "P@ssw0rd!" is weak)
- What's actually inside a QR code (and what its size means)
- How diff algorithms work: Myers, patience, and why some diffs read better
- What every modern browser exposes about your device (and what it doesn't)
- What's the difference between IPv4 and IPv6?
- Is my IP address public or private?
- Why your VPN isn't hiding your IP (and how to check)
- How to fix "JSON parse error" messages
- Why your microphone shows up but no one can hear you on Zoom
- How to test your microphone and camera before a Zoom call
- How to check if IPv6 is working on your connection
- Best free JSON formatter for large files