Free browser, network, and developer tools
Fast, privacy-respecting utilities that run in your browser — IP checker, JSON formatter, UUID generator, browser diagnostic, and more. No sign-up required.
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Why use ToolPage
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No sign-up
Every tool works the moment the page loads. No accounts, no paywalls.
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Privacy-respecting
Sensitive tools — password strength, mic, camera — run entirely in your browser. Nothing is uploaded.
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Fast on mobile
Each tool is a single page, built to load instantly on any connection.
Latest guides
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What does your IP address actually reveal about you?
An honest accounting of what an IP address actually tells anyone who sees it — and what the marketing around "IP tracking" gets wrong.
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How DNS records work — A, AAAA, MX, TXT, and CNAME in plain English
A practical tour of DNS record types — what each one is for, how TTLs and caching behave, and why propagation takes the time it does.
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UUID v1, v4, v7, v8: which version should you use?
An opinionated tour of the UUID versions — what each one does, when it's the right tool, and where each one bites you.
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Why your JSON is invalid: a field guide to common parse errors
A taxonomy of the seven categories of JSON parse error, the actual fixes for each, and why your editor's red squiggle isn't enough.
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Reading ping results: latency, jitter, and packet loss explained
Latency is what people mean when they say "lag" — but jitter and packet loss break things that latency alone wouldn't.
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Why every speed test gives you a different number
Three speed tests in a row will give you three different numbers. Here's why — and which one is actually telling you what you want to know.