Random PIN Generator
Generate a secure random numeric PIN (4–12 digits) in your browser. Free, private, nothing stored.
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A truly random PIN is much harder to guess than one a person invents. Humans tend to reach for birthdays, anniversaries, repeated digits like 1111, or well-known sequences like 1234 — patterns that attackers try first. This generator produces a uniformly random numeric PIN using your browser's Web Crypto API, ensuring every digit is independently and cryptographically random with no bias toward any pattern. Choose your length: 4 digits for ATM-compatible PINs, 6 digits for SIM cards and many mobile lock screens (offering one million possible combinations versus ten thousand for a 4-digit PIN), or up to 12 digits for high-security vaults and enterprise systems that support longer codes. Use the longest PIN your system allows — each extra digit multiplies the possible combinations by ten. As with all secrets, never share your PIN over the phone or via text, and avoid writing it anywhere near the device it protects.
Frequently Asked Questions
What is a good PIN length?
Use the longest PIN the system allows. A 4-digit PIN has 10,000 possible combinations; a 6-digit PIN has 1,000,000 — one hundred times more. For any situation where you can choose, 6 digits or longer is strongly preferred. Avoid PINs based on dates, phone numbers, or any personally meaningful sequence.
Is a random PIN safer than one I choose myself?
Yes. People consistently choose PINs with recognizable patterns — calendar years, birth dates, repeated digits — that appear disproportionately often in leaked PIN databases. A cryptographically random PIN eliminates this bias entirely, ensuring every possible combination is equally likely.
How many combinations does a 6-digit PIN have?
A 6-digit PIN has one million possible combinations, versus ten thousand for a 4-digit PIN — a hundredfold difference. Each additional digit multiplies the number of possibilities by ten, which is why using the longest PIN a system allows meaningfully improves security.
What PINs should I avoid?
Avoid birthdays, years, repeated digits like 1111, simple sequences like 1234 or 2580, and anything tied to you personally. These dominate leaked PIN datasets and are the first values an attacker tries. A cryptographically random PIN sidesteps all of these patterns.
Is a 4-digit PIN safe enough?
For devices that strictly limit guess attempts and lock out after a few failures, a random 4-digit PIN can be acceptable. Where the system allows it, 6 or more digits is far safer — especially against an attacker who can try many guesses or has seen leaked data.
Can I use this for a SIM, ATM, or phone PIN?
Yes. It produces uniformly random numeric codes from 4 to 12 digits, suitable for SIM and PUK locks, ATM and debit cards, phone lock screens, safes, and any system that takes a numeric PIN. Pick the longest length the system accepts.
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Written & reviewed by Andrew Ivanov, Fractional CTO. Last reviewed .