How to use PIN Generator
Generate cryptographically random PINs of any length — 4-digit, 6-digit, or custom length numeric codes. All generation uses the Web Crypto API for true randomness, never Math.random(). Use it for setting device PINs, generating one-time codes, creating temporary access codes, or testing PIN entry forms. Avoids trivially guessable patterns like 1234 or repeated digits.
- Select the PIN length: 4 (standard ATM/device), 6 (two-factor auth apps), or custom.
- Toggle "Avoid patterns" to exclude runs (1234), repetitions (1111), and common PINs (0000, 9999).
- Click Generate to create a new random PIN.
- Click Copy to copy the PIN to your clipboard.
- Click Generate again to create a new PIN without repeating the last one.
Your data never leaves your device — 100% private processing.
PIN security: 4-digit vs. 6-digit
A random 4-digit PIN has 10,000 possible values. If an attacker gets 10 guesses before lockout (typical for ATMs and phones), the probability of success is 0.1% — acceptable risk for physical-access scenarios with lockout. However, analysis of leaked PIN databases shows 20% of PINs are from a "top 20" list (1234, 0000, 1111, 1212, etc.), reducing the effective security dramatically. A random 6-digit PIN has 1,000,000 values and is standard for TOTP (time-based one-time passwords) in 2FA apps. This generator explicitly avoids the top 100 most-common PIN patterns.
| Length | Possible values | Security use case |
|---|---|---|
| 4 digits | 10,000 | Device PINs, ATM cards |
| 6 digits | 1,000,000 | TOTP 2FA, phone unlock |
| 8 digits | 100,000,000 | High-security numeric codes |
| 10 digits | 10,000,000,000 | Numeric activation codes |
Avoiding common PIN patterns
Research on leaked PIN databases reveals predictable human patterns that reduce real-world PIN security. The top 10 most common 4-digit PINs (1234, 0000, 1111, 1212, 7777, 1004, 2000, 4444, 2222, 6969) account for nearly 15% of all PINs in leaked datasets. Keyboard walk patterns (1234, 2580, 1357) and birth year patterns (19XX, 20XX) are also heavily over-represented. This generator filters out these predictable patterns and includes a "common PIN check" that warns if the generated PIN appears in the top-500 most used PINs list.
Worked examples
4-digit PIN
Inputs: length 4 · avoid patterns
Result: e.g. 7048 — 1 of 10,000; skips 1234/0000
6-digit PIN
Inputs: length 6
Result: e.g. 392715 — 1 of 1,000,000 (TOTP-style)
Glossary
- TOTP
- Time-Based One-Time Password — a 6-digit code that changes every 30 seconds, used in authenticator apps like Google Authenticator.
- Brute force
- Systematically trying all possible values — a 4-digit PIN can be brute-forced in under a second without lockout protection.
- Entropy
- The unpredictability of the PIN — a truly random 4-digit PIN has log2(10000) ≈ 13.3 bits of entropy.
- Lockout policy
- A security control that disables PIN entry after a set number of failed attempts, preventing brute-force attacks.
Related reading
Frequently Asked Questions
Why use PIN Generator?
- Avoid predictable patterns like 1234 and 0000 that dominate breach datasets
- Choose 4-, 6-, or custom-length codes for different access-control scenarios
- Built-in common-PIN filter warns when output matches a top-500 known pattern
- Cryptographic entropy source prevents sequential or timestamp-biased output
Common use cases
- Create a 6-digit PIN for a new smartphone screen-lock configuration
- Generate a temporary numeric access code for a shared office door lock
- Produce a one-time 4-digit code to send a customer for identity verification
- Set a secure ATM PIN that avoids birth year and anniversary date patterns
- Test a PIN entry form with realistic numeric codes during QA testing
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