Developer Tools
That Just Work
Free, offline-capable, no-nonsense utilities for developers
Our Mission
100% Free
All tools are completely free. No trials, no subscriptions, no hidden fees.
Works Offline
All processing happens in your browser. No internet required after loading.
Privacy First
Your data never leaves your browser. We don't track, store, or sell anything.
Live Statistics
Available Tools
Font Awesome Validator
Check if your Font Awesome icons are available in the free version.
Try It Now →QR Code Generator
Create custom QR codes for URLs, WiFi, contacts, and more with full customization.
Try It Now →QR Code Scanner
Scan QR codes with your device camera. Works fully offline and client-side.
Try It Now →Barcode Generator
Generate CODE128, EAN-13, UPC, and 7 other barcode formats with customization.
Try It Now →UUID Generator
Generate RFC4122 compliant UUIDs (v1, v3, v4, v5) with bulk generation support.
Try It Now →About RJL.io
RJL.io was created by RJ Lindelof, a technology executive with over 34 years of software development experience and 20 years of engineering leadership. After decades of building enterprise-scale systems and leading global development teams, RJ recognized a fundamental problem in the developer tools ecosystem - most utilities require server round-trips, collect user data, or demand registration before providing value. RJL.io was born from a simple philosophy: developers deserve tools that respect their privacy, work instantly, and function offline. Every tool on this platform processes data entirely in your browser, stores nothing on servers, and works without an internet connection once loaded.
Speed, privacy, and accessibility drive every decision at RJL.io. We believe powerful tools should load in milliseconds, not seconds. Your code and data should never leave your device. And no developer should need to create an account, accept cookies, or navigate through paywalls to validate an icon or format code. This commitment extends across the entire RJL ecosystem - from AI-powered development resources at RJL.ai to the broader technology community at RJL.tech. Built by developers, for developers. Part of the RJL ecosystem.