PIN & OTP Generator
Generate secure random PINs, OTPs, and numeric codes of any length. Useful for testing authentication flows, generating temporary passwords, and creating access codes.
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How to use this calculator
Each digit is independently randomised. Avoid consecutive sequences (1234) and repeated digits (1111) modes are optional filters.
- 1
Set the code length (4–12 digits) and how many codes to generate.
- 2
Enable "avoid sequential" to skip codes like 1234 or 4567.
- 3
Enable "avoid all-same" to skip codes like 0000 or 1111 (on by default).
Frequently asked questions
How long should a PIN be?
A 4-digit PIN has 10,000 combinations — acceptable for low-risk use with lockout after 3 attempts. For banking: 6 digits minimum (1 million combinations). For OTPs in authentication flows: 6 digits is the standard. For high-security codes: 8+ digits.
What makes a PIN weak?
The most commonly guessed PINs are sequential (1234, 0123) and repeated (1111, 0000) — both are filtered by this tool. Also commonly guessed: 1990–2009 (years of birth), 0000, 9999, 1010, and any triple repeat (1112, 4445).
What is OTP?
OTP (One-Time Password) is a PIN that is only valid for a single transaction or session. It adds a second factor of authentication (2FA) — even if someone knows your main password, they also need the OTP sent to your phone or email. OTPs are typically 6 digits, expire in 30–300 seconds, and are used by apps like Google Authenticator.
PIN & OTP Generator — Secure Random Codes
PIN security and guessing attacks
A 4-digit PIN protects against casual guessing but falls in milliseconds to a brute-force attack without rate limiting. Modern systems mitigate this with lockout after 3–10 failed attempts, time delays between attempts, and SIM-lock after too many failures. The PIN itself provides little cryptographic security — the security comes from the lockout mechanism.
OTP vs TOTP
OTP (One-Time Password) is sent to you via SMS or email and is valid for a fixed time. TOTP (Time-Based OTP, RFC 6238) is generated by an app like Google Authenticator using a shared secret and the current time — no network connection needed. TOTP is more secure than SMS OTP because SMS can be intercepted via SIM-swapping attacks.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →