Über Webtools

What is Webtools?

Webtools is an independent collection of free utility tools covering text manipulation, number calculations, color conversion, code formatting, date and time handling, unit conversion, word games, and random generation. Most tools run entirely in your browser, so what you type into them stays on your machine; a handful that need a real database or PHP library — word-list lookups, Markdown and YAML parsing, hashing — compute on the server and return only the result.

The site currently offers 70+ tools across eight categories. Tools are purpose-built for the tasks developers, writers, designers, and everyday users search for most: formatting JSON, converting between letter cases, checking color contrast for accessibility, decoding JWTs, calculating dates, and dozens more. Each tool ships with a written explanation, worked examples, and a short FAQ — because using a converter is one thing, and understanding when to reach for camelCase over snake_case (or what a WCAG AA contrast ratio actually means) is another.

Who built Webtools?

Webtools is built and maintained by Bart Klein Reesink, a software developer based in the Netherlands with over fifteen years of professional experience building web applications in PHP, Laravel, JavaScript, and modern front-end frameworks. The site is a one-person project: I write every tool, every line of explanation text, and every FAQ answer myself, drawing on day-to-day work as a developer.

It started as a personal toolbelt — the small calculators, converters, and formatters I kept reaching for and could never find quickly enough without ad-saturated, sluggish, or sketchy alternatives. Putting them online means I can use them from any device, and so can anyone else who finds them useful. If you want to get in touch about anything on the site, the contact page reaches me directly.

Editorial standards

Every tool is written, tested, and documented before it goes live. Calculations are unit-tested against reference values; algorithms (hashing, encoding, color conversion, regex, date math) follow published standards (RFCs, WCAG, ISO, IETF) rather than ad-hoc implementations. Where a tool produces an answer that depends on convention — for example, the difference between AP-style and Chicago-style title case, or which Pantone catalogue a colour name comes from — the explanation makes the choice explicit so you can decide whether the tool fits your use case.

Written content is updated when the underlying standards change or when readers point out errors. Corrections are welcome and applied quickly — the entire site is one person's work, so there is no editorial layer to push past.

Why is it free?

These tools are genuinely free with no registration, no paywalls, and no rate limits. The goal is simple: if a tool solves a common problem, it should be available to everyone instantly. Webtools is a passion project — the site covers its own hosting costs through unobtrusive advertising, and exists because building useful things is worthwhile. There is no upsell, no "pro" tier, and no plan to lock features behind an account.

Privacy and how the tools work

The site runs on Laravel and Livewire on the backend, with Alpine.js and Tailwind CSS on the front end. Most tools — the calculators, color utilities, text transforms, encoders, formatters, and converters — compute entirely in your browser, so what you type into them never leaves your device. The few that need real PHP or a database (word-list lookups, Markdown and YAML parsing, server-side hashing) round-trip to the server, but the input is never logged or persisted.

For full details on cookies, analytics, and data handling, see the privacy policy.

What categories are available?

• Text tools — case conversion, character counting, text diff, lorem ipsum, find & replace, line sorting and dedupe, slug generator, word frequency, Markdown → HTML
• Number tools — calculator, percentage, tip, fraction, ratio, loan, compound interest, statistics, salary converter
• Color tools — color converter, palette generator, contrast checker, gradient generator, color blindness simulator, tints & shades, color name finder, Tailwind color matcher
• Code tools — JSON formatter, Base64 encoder, URL encoder, JWT decoder, UUID generator, hash generator, regex tester, YAML ↔ JSON, CSV ↔ JSON, SQL formatter
• Convert tools — unit, temperature, currency, file size, Roman numerals, number bases, cooking measurements, coordinates, running pace
• Time tools — timestamp converter, timezone converter, date difference, age calculator, cron parser, working days, Pomodoro timer, meeting planner, stopwatch, date arithmetic
• Word tools — Scrabble word finder, word unscrambler, anagram solver, rhyme finder, syllable counter, Pig Latin, NATO phonetic alphabet, crossword solver
• Random tools — password generator, random number generator, dice roller, coin flipper, random picker, lottery numbers, team randomizer, random word, wheel of names

When did Webtools launch?

Webtools launched in 2025 with an initial set of 30 tools and has since grown to over 70. New tools are added regularly based on what people search for and what is genuinely missing or underserved on the open web. If there's a common utility task that isn't covered yet, you can suggest it — most accepted suggestions ship within a few weeks.

Contact

Questions, bug reports, corrections, or tool requests are welcome. The contact page goes straight to my inbox — there is no support team, just me. I read everything and reply to anything that needs a reply.