Developer & NetworkUtilities
Complete Linux Tutorial & Sysadmin Guide
Master Linux command-line essentials: Filesystem hierarchy, permissions, process management, SSH security, package managers, and production server hardening.
Developer Tools
100% private, browser-executed utilities
Subnet Calculator
IPv4 CIDR subnet tool with visual bit-allocation bar, netmask, wildcard, and host range calculations.
JWT Decoder
Real-time JSON Web Token decoder with header/payload syntax highlighting and expiration checker.
Hash Generator
SHA-256, SHA-512, SHA-384, SHA-1 cryptographic hash generation using browser SubtleCrypto.
UUID / GUID Generator
Generate cryptographically secure UUID v4 (random) and UUID v7 (time-ordered) IDs with bulk export.
JSON Formatter & Validator
Beautify, validate, sort keys, and minify JSON payloads with syntax highlighting and instant error reporting.
URL Codec & Query Parser
Percent-encode and decode URIs and inspect query parameters in an interactive key-value table.
Password & Secret Generator
Cryptographic high-entropy passwords, API tokens, and passphrases with NIST strength meter.
Chmod Permissions Calculator
Interactive visual matrix for Linux file permissions. Computes octal (755, 644) and symbolic notation.
Base64 Codec
UTF-8 to Base64 and Hex encoder/decoder with real-time output. Perfect for API authentication.
Cron Parser
Human-readable cron expression parser for 5-field crontab schedules with common presets and next-run preview.