PIN & OTP Generator
Generate random PINs and one-time passwords securely in your browser — never sent to any server.
Each PIN is generated locally in your browser using crypto.getRandomValues() — not sent anywhere.
When to use PINs vs OTPs
ATM cards, device lock screens, simple security codes. 10,000 combinations — secure enough for rate-limited systems.
Standard for two-factor authentication (2FA), bank transactions, email verification. 1,000,000 combinations.
High-security applications, courier tracking codes, voucher systems. Alphanumeric 8-char = 218 trillion combinations.
Frequently asked questions
What is the difference between a PIN and an OTP?
A PIN (Personal Identification Number) is a secret that you set and reuse. An OTP (One-Time Password) is generated fresh for each use and expires quickly — usually within 30–300 seconds. OTPs are more secure because capturing one gives no ongoing access.
Is a 4-digit PIN secure?
For systems with lockout after 3–10 wrong attempts (like ATMs), 4 digits is secure. For applications without rate limiting, 4 digits (10,000 combinations) can be brute-forced quickly. Use 6+ digits for digital applications.
How do real OTP apps (like Google Authenticator) work?
They use TOTP (Time-based OTP) — a shared secret combined with the current Unix timestamp, hashed with HMAC-SHA1. This produces a 6-digit code that changes every 30 seconds. This generator produces random codes for testing, not time-based codes.
Can I use these PINs for actual security?
Yes, for testing, temporary codes, vouchers, and scenarios where you need random values. For live authentication systems, use a proper OTP library (pyotp, speakeasy) that implements TOTP/HOTP correctly.
What character set does alphanumeric use?
Alphanumeric uses A–Z (uppercase), a–z (lowercase), and 0–9 — 62 characters total. An 8-character alphanumeric code has 62^8 ≈ 218 trillion combinations, vastly more than numeric-only.