Free online utilities built for QA & engineers
Percentile math, JWT decoder, selector tester, Taiwan test data, framework cheatsheets — all run in your browser. Nothing uploaded.
Performance
Percentile calculator
Paste response times → p50/p90/p95/p99 + Apdex
API & Security
JWT decoder / generator
Decode header / payload / expiry, re-sign with secret
Automation
CSS / XPath selector tester
Paste HTML + selector → live highlight of matches
Test data
Taiwan test data generator
Valid TW national ID, BAN, mobile, Luhn credit cards
Reference
Test framework cheatsheet
Robot Framework / Playwright / Appium quick reference