About
A growing collection of fast, private, no-signup online tools: word counter, password generator, QR code, JSON formatter, BMI, unit converter, and more.
Mission
arnaud.app is a growing collection of small online utilities that solve everyday problems without asking for your email, your data, or your attention. The pitch is simple: open the page, do the thing, close the tab. No accounts, no popups, no upsell, no seven-day trial that bills your card on day eight. Every tool exists because at some point someone needed it and got tired of the existing options being slower, ad-laden, or behind a signup wall.
Principles
Private by default
Most tools run entirely in your browser. Your data never leaves your device.
Fast
Static pages, instant results. No spinners, no upsells, no popups.
Free, no signup
No account, no paywall, no watermark. Just tools.
Privacy in practice
Pageviews are tracked via Umami Cloud (cookieless, aggregate) and Core Web Vitals via Vercel Speed Insights. Neither sees the text, files, passwords or JSON you paste into a tool. There are no third-party trackers, no advertising pixels, no fingerprinting scripts. The only cookies the site sets are your language choice and your theme choice - and only when you actually change them.
How it's built
The site is a Next.js 15 application written in TypeScript, styled with Tailwind CSS, and statically pre-rendered for every locale. Most tools run entirely in your browser using the Web Crypto, Intl and Canvas APIs; nothing is uploaded unless a tool explicitly says so. Static hosting keeps the carbon and the cost low - the whole site weighs less than most ad-laden single pages on the competition.
What's next
The catalogue grows in response to what people actually search for. Recent additions include a kitchen converters hub, a recipe scaler, an oven-temperature converter and a microwave-time calculator. On the roadmap: currency-pair landing pages (USD/EUR, GBP/JPY, etc.), native review of the non-English copy, and the tools that come up most often in feedback. If something you'd find useful is missing, it's probably worth adding.
Built for the open web.