System Tools

What's in this category

A grab-bag of utilities for the kind of work that fills a Linux admin's day: parsing certificates, decoding JWTs, building cron expressions, calculating IOPS for storage plans, generating credentials, and testing regex against real log lines. These aren't toys — each one was built because we needed it during real on-call work and wanted something that runs without a network connection.

Every tool processes everything locally in your browser. The Certificate Parser never sees your cert. The JWT Decoder never sees your token. The Passphrase Generator uses your browser's cryptographic random source, not a server-side word list. Cron expressions, chmod permissions, and IOPS numbers are all pure math — no reason for them to round-trip a server. Use the Regex Tester for PCRE-style patterns against sample text with live highlighting, and the Log Parser when you need to grep, filter, and analyze raw logs without piping them anywhere unsafe.