My Toolbox is a collection of 22 browser-based utilities built for people who'd rather get things done than hunt for the right app. Every tool runs entirely in your browser — your data never leaves your device, and there's nothing to install or sign up for.

We started this project in 2024 after getting tired of ad-heavy "free" tools that upload your JSON configs or passwords to unknown servers. The result: fast, private utilities that work offline once loaded. No tracking pixels, no email gates, no upsells.

A Note From the Developer

Why I Built This Site

My Toolbox is a solo project. I'm an independent developer who builds browser-based utilities in my own time, and I run this site because I got tired of the same trade-off showing up on every online tool: sign up, watch ads with modal popups, or paste your data into a page that quietly logs everything server-side. When you're decoding a production JWT or checking a loan calculation with real numbers, none of those are acceptable.

Every tool here is a plain React component that computes results inside your browser. The Vercel edge servers only serve static HTML, CSS, and JavaScript files. After a page loads, nothing you type is sent anywhere — you can verify this yourself by opening DevTools > Network while using any tool. Financial and health calculators document the formulas they use (WHO 2000 BMI thresholds, Mifflin-St Jeor for calories, standard amortization for mortgages) so you can double-check the math, not just trust a black box.

I update tools when I find bugs, when users email me about edge cases, and when the underlying standards change. If a tool has a known limitation, it's written in the tool's own page — not hidden in fine print. Feedback is genuinely welcome through the contact page.

Developer Tools

Format JSON with trailing-comma detection, encode Base64 for JWT debugging, generate SHA-256 hashes for file integrity checks, or test regex patterns with real-time highlighting. Built by developers who use these tools daily — so edge cases like 50 MB JSON files and multi-line regex are handled properly.

Financial Calculators

Run mortgage scenarios with extra-payment comparisons, calculate compound interest with the Rule of 72, or convert currencies using mid-market rates. Every calculator shows the formula it uses and lets you export results — no black-box math.

Converters & Utilities

Convert units across 10 categories, pick colors in HEX/RGB/HSL, generate QR codes up to 4,296 characters, or calculate BMI with WHO classification. Each tool is keyboard-accessible and works on mobile without layout shifts.

Why People Use My Toolbox

100% Client-Side Processing

Your data stays in your browser. We don't send anything to a server — check the Network tab yourself. No cookies, no analytics, no fingerprinting.

Actually Free, No Catch

No freemium limits, no "sign up to unlock" walls, no ads. The site costs us about $12/month to host on Vercel, and we're fine with that.

Zero Registration Required

Bookmark it, use it, close it. We don't need your email, and we won't ask for it. Ever.

Sub-Second Load Times

Static pages served from edge CDN nodes in 30+ regions. Typical first-paint under 400ms on 4G. No client-side framework hydration blocking your input.