Utility Tools
Practical tools for everyday calculations and conversions
Our utility tools are designed to make everyday tasks faster and easier. From converting units and counting text to generating QR codes and debugging JWT tokens — each tool runs entirely in your browser with zero data uploads. Built for speed, privacy, and simplicity.
Unit Converter
Convert length, weight, and temperature units instantly
Text Counter
Count characters, words, sentences, and paragraphs
QR Code Generator
Create QR codes from URLs or text
Color Converter
Convert between HEX, RGB, and HSL colors
D-Day Calculator
Calculate days until or since any date
BMI Calculator
Calculate your Body Mass Index
JWT Debugger
Decode and inspect JSON Web Tokens
JSON/YAML Converter
Convert and prettify JSON and YAML
Kubeconfig Manager
Manage Kubernetes kubeconfig files easily
Text Share
Compress text and share as a URL with optional encryption
Pick the right tool
Three of the calculators here have known precision tradeoffs worth flagging. The Unit Converter uses double-precision floats, which means very large temperature deltas (above ~1015 K) lose meaningful digits — fine for everyday use, not for physics homework on extremes. The BMI Calculator implements the standard kg / m² formula but BMI is a population statistic, not a personal diagnosis (it can't distinguish 80 kg of muscle from 80 kg of fat — see our deep-dive on body composition). The D-Day Calculator ignores DST and leap-second adjustments by design — it works in calendar days, not elapsed seconds.
The developer-oriented tools (JWT Debugger, JSON/YAML Converter, Kubeconfig Manager) all run client-side, so you can paste tokens or kubeconfigs without them touching a server. That matters: many similar tools online send your input to a backend "for processing." If you're inspecting a JWT that contains a session ID, that's a real leak. See JWT storage tradeoffs and the kubeconfig context guide for context.
Looking for image work? See the Image tools index. Looking for randomizers and decision aids? See Fun & Random.