About 365utils
365utils.com is a growing collection of free, fast online tools built for everyday users and developers alike. From SSL certificate checkers and CSS minifiers to currency converters and health calculators, every tool runs entirely in your browser — your data never leaves your device. No sign-ups, no paywalls, no uploads to our servers.
We built 365utils because useful utilities should be accessible, trustworthy, and private. Whether you need a quick hash, a QR code for Wi-Fi, or a health calculation, you get a clean interface, instant results, and zero tracking of your inputs.
Our Mission
Privacy First
Every tool processes data entirely in your browser. We never see, store, or transmit your inputs — ever.
Fast & Lightweight
Built with modern web technology for instant load times. No heavy frameworks, no bloat, no waiting.
Free for Everyone
All tools are completely free. No premium tiers, no paid features, no hidden costs. Ever.
Tools at a Glance
Total tools
90
Categories
7
Processing
100% Local
Tools by Category
Our Story
365utils was born from a simple frustration: every time we needed a quick utility — a password hash, a JSON formatter, a unit conversion — we had to either install heavy desktop software or trust random websites with potentially sensitive data. Many online tools upload your data to their servers, run questionable analytics, or bury their useful features behind paywalls.
We decided to build a different kind of tool site. One where everything runs locally, where privacy is not an afterthought but the foundation, and where every tool is completely free — no credits, no subscriptions, no limits.
Today, 365utils features 90 tools across 7 categories, with new tools added every week. Our growing blog provides in-depth guides and tutorials to help you get the most out of each utility. We're committed to keeping the web a more private, more productive place — one tool at a time.
Built With Modern Web Technology
365utils is a modern web application designed for speed, accessibility, and privacy. By leveraging the latest web platform APIs and a lean tech stack, every page loads fast and every tool responds instantly.
- SvelteKit 2 & Svelte 5
Reactive UI framework with fast client-side routing, minimal bundle size, and compile-time optimizations for instant interactivity.
- TypeScript
Type-safe codebase ensuring reliable tool logic, better maintainability, and fewer runtime errors across all 365utils components.
- Tailwind CSS v4
Utility-first styling engine with a custom dark-first design system, responsive breakpoints, and consistent design tokens.
- Cloudflare Pages
Global edge network hosting for fast, reliable content delivery worldwide. Automatic HTTPS, DDOS protection, and instant cache purging.
- Vite 8
Next-generation build tool providing lightning-fast hot module replacement in development and highly optimized production builds with code splitting.
- Developer Icons & Lucide
Consistent, open-source iconography throughout the interface. Every icon is crisp, scalable, and carefully chosen for clarity.
What's New
We've been busy expanding our toolkit. Here are the latest additions across security, developer tools, converters, calculators, and more:
- Security & Network
SSL Certificate Checker, IP Address Lookup, CORS Header Tester, HTTP Headers Inspector, and OTP/TOTP Generator.
- Developer Tools
HTML/CSS/JS Formatters and Minifiers, Markdown/JSON/CSV converters, HTTP Status Reference, Number Base Converter, Color Code Converter, and more.
- Finance & Health Calculators
Currency Converter, VAT/Tax Calculator, Compound Interest, Salary Converter, Percentage Calculator, Calorie Calculator, Body Fat, Water Intake, and Ideal Weight calculators.
- Design & Preview Tools
Aspect Ratio Calculator, Screen Resolution Simulator, Favicon Generator, Open Graph Preview, and Twitter Card/LinkedIn Post Preview.
Get in Touch
We're always looking for feedback, suggestions, and collaboration opportunities. Whether you found a bug, want to request a tool, or are interested in advertising partnerships, we'd love to hear from you.