26 free technology tools for developers, sysadmins, designers, and anyone who works with digital systems. Convert between every number base and encoding format, plan IP subnets, generate cryptographically secure passwords, decode JWTs, build cron expressions, format JSON, test regex patterns, convert CSS units, and explore color spaces — entirely in your browser, with no sign-up and no data sent to a server. Every tool works offline once loaded.
Manual bit-shifting, subnet arithmetic, encoding lookups, and color-space conversions are tedious, error-prone, and interruptive. These tools give you the right answer in seconds so you stay focused on the problem you're actually solving — whether that's debugging an API, planning a network, writing a stylesheet, or hardening a system. Because everything runs client-side, sensitive data like tokens, passwords, and JWT payloads never leaves your machine.