Estimate password crack times from length, charset, and attacker speed — entropy made visceral. Show why 8-char passwords fall in hours — local math, free, no signup.
Content reviewed October 2026 · About Toolzum
Generate PBKDF2 hashes with 10,000 iterations of SHA-256 for password storage simulation. Tune iterations to hardware — slower hashes resist brute force — free, local, no signup.
Estimate API bills from request volumes and price-per-million — OpenAI and Stripe presets included. Forecast a 1M-request month before committing — local math, free, no signup.
Calculate password entropy in bits to measure password strength against brute-force attacks. Code never leaves your device — formatting and validation run locally in your browser.
Evaluates password strength using zxcvbn entropy analysis: 0–4 score, crack-time estimate, warnings, and fix suggestions.
Estimate travel time from distance and speed — with optional arrival time and traffic buffer. Add traffic buffers and arrival targets for realistic plans — free, local, no signup.
Lowercase-only at 10B guesses/sec: hours. Add uppercase, digits, symbols (95 charset): same length jumps to years. Length beats complexity — 12 chars dwarfs 8 every time.
No — the math is textbook combinatorics defenders already use. It justifies passphrases and MFA to skeptics with numbers.
No — estimation runs locally in your browser. Passwords never leave your device — never enter real ones anywhere.
Password Entropy Calculator
Calculate password entropy in bits to measure password strength against brute-force attacks. Code never leaves your device — formatting and validation run locally in your browser.
Hash Password Generator
Generate password hashes using PBKDF2-SHA256 with 600,000 iterations for secure password storage. Code never leaves your device — formatting and validation run locally in your browser.