About ToolBox

Why we built this

Every developer, student, or office worker eventually needs to encode a string, format some JSON, calculate a tip, or convert kilograms to pounds. Most of the tools you find when you search for those tasks are buried under newsletter pop-ups, cookie banners stacked three deep, and intrusive ads that obscure the actual input field. Some of them also quietly send your data to a server — which, if you’re pasting in API responses, JWTs, or anything resembling a password, is a problem.

We wanted a single place where everyday utilities just work: a clean form, a result, a copy button, and nothing else demanding your attention. ToolBox is the result. Every tool runs entirely inside your browser using standard Web APIs — nothing you type into a ToolBox tool ever leaves your device.

What you’ll find here

ToolBox currently offers 33 tools organised into five categories:

• Text tools — word counter, case converter, Lorem Ipsum generator, text diff, Markdown to HTML, duplicate line remover, text reverser, HTML entity encoder.
• Developer tools — JSON formatter, Base64 encoder, regex tester, URL encoder, color picker, cron builder, hash generator, JWT decoder, CSS gradient builder.
• Calculators — percentage, age, tip splitter, BMI, loan/EMI, compound interest, and date difference calculators.
• Generators — password, UUID, QR code, and random value generators.
• Converters — length, weight, temperature, speed, and number base converters.

Each tool is paired with an editorial guide that explains how the underlying calculation or transformation works, walks through worked examples, and addresses the questions people most commonly ask. The goal is that a reader who lands on a page from a search engine actually learns something instead of just running a black-box calculation.

Our principles

• Privacy first. No data leaves your device. We do not log inputs, store cookies for our own analytics, or pass your text to a server (with one clearly labelled exception — the QR generator uses a public image API).
• No accounts. Nothing on ToolBox requires a sign-up. There is no “free trial” tier and no paywall hiding the useful features.
• Fast and lightweight. Pages are statically generated and small. The tools are interactive immediately — no spinner, no loading screen.
• Honest content. We try to write our guides like a friendly senior colleague would explain something at a whiteboard, not like SEO filler. If a tool has limitations, we say so.
• Open to feedback. If a calculation is wrong, a tool feels clunky, or a guide is misleading, please tell us via the contact page. We read everything.

How ToolBox is funded

ToolBox is free to use. We do not sell user data — in fact, we don’t collect any to sell. Hosting, domain, and the time we spend writing and maintaining the tools is partly supported by unobtrusive display advertising shown around (never on top of) the tool interfaces. If you’d like to disable those, any standard browser ad-blocker will do so without breaking any tool.

Technical notes

ToolBox is built with Next.js and React, statically hosted on Vercel. Cryptographic operations use the browser’s built-in SubtleCrypto API. The site is open to inspection — you can view the page source on any tool and confirm that no input you provide is being POSTed anywhere.

We support light and dark themes, three text sizes, and full keyboard navigation. We aim to meet WCAG 2.1 AA contrast guidelines and tag the tools with appropriate ARIA labels. Accessibility issues are treated as bugs — please report any you find.

Get in touch

Questions, bug reports, feature requests, or content corrections are welcome through the contact page. For privacy and data-handling questions, see the Privacy Policy.