Security and password tools

Security tools generate or check credentials with a hard rule: nothing leaves your browser. A password generator that sends candidates to a server is a back door waiting to happen — these tools use the browser's built-in crypto.getRandomValues for cryptographically random output and never make a network call after the page loads.

The password generator produces random passwords with configurable length and character classes (lowercase, uppercase, numbers, symbols). The default 16-character output with all four classes gives roughly 105 bits of entropy — well beyond what brute-force attacks can reach within hardware lifespans. The passphrase generator uses the EFF Diceware long wordlist for memorable but high-entropy passphrases (six words gives roughly 78 bits of entropy and is dramatically easier to type and remember than a random-character string of similar strength).

The color contrast checker measures contrast ratio between two colors per WCAG 2.1, reporting Pass / Fail status against the four standard thresholds (AA Normal, AA Large, AAA Normal, AAA Large) plus the AA non-text contrast (UI components and graphical objects, 3:1 minimum). Use this to verify text colors against backgrounds, button states against page backgrounds, and any interactive element against its surroundings before shipping accessibility-sensitive UI.