Random PIN generator
A PIN generator picks digits at random instead of letting you reach for a birthday. That matters more than people expect: the ten most common four-digit PINs cover about 20% of all PINs in circulation, so a random PIN removes the single cheapest attack on your card or phone.
How many PIN combinations are there?
A PIN of n digits has 10n possible values, because each position holds one of ten digits independently. The jump between lengths is a clean factor of ten each time, which is why moving from four digits to six is worth far more than any clever choice of digits.
| Digits | Combinations | Entropy | Odds of one guess |
|---|---|---|---|
| 4 | 10,000 | 13.3 bits | 1 in 10,000 |
| 5 | 100,000 | 16.6 bits | 1 in 100,000 |
| 6 | 1,000,000 | 19.9 bits | 1 in 1,000,000 |
| 8 | 100,000,000 | 26.6 bits | 1 in 100,000,000 |
The PINs you must never use
The definitive public analysis of PIN choice remains Nick Berry's 2012 study of 3.4 million exposed four-digit PINs. Its headline finding still holds: human PIN choice is not remotely uniform. The single PIN 1234 accounted for over 10% of the entire dataset, and the ten most common PINs together covered roughly 20%.
| Rank | PIN | Share of all PINs |
|---|---|---|
| 1 | 1234 | 10.7% |
| 2 | 1111 | 6.0% |
| 3 | 0000 | 1.9% |
| 4 | 1212 | 1.2% |
| 5 | 7777 | 0.7% |
| 6 | 1004 | 0.6% |
| 7 | 2000 | 0.6% |
| 8 | 4444 | 0.5% |
| 9 | 2222 | 0.5% |
| 10 | 6969 | 0.5% |
Source: DataGenetics analysis of 3.4 million exposed PINs (Nick Berry, 2012).
Read the full table and methodology in the 10 most common 4-digit PINs, then generate a random PIN that avoids the same patterns.
Two further clusters matter as much as the top ten. Roughly one PIN in five follows the MMDD or DDMM shape of a date, and a large band sits in the 19xx range because people use birth years. A thief who knows your birthday and gets three attempts has odds that look nothing like 3 in 10,000. This generator excludes all three clusters by default.
Why three attempts is not as protective as it sounds
Card and phone lockouts limit guessing to about three attempts, which is genuinely strong protection against a random guesser. It is much weaker against someone who knows you. If your PIN is your birth year, your child's birth date, or your house number, the attacker is not making three random guesses out of 10,000 — they are making three targeted guesses out of maybe fifty candidates.
Random beats memorable here, because the entire protective value of a PIN comes from being outside the guessable set.
Remembering a random PIN
The usual objection to a random PIN is that you will forget it. Two things help. First, type it from memory five or six times on the day you set it — recall practice, not repetition, is what fixes a number in place. Second, if you would rather not rely on memory at all, MoolKey can recreate the same PIN on demand from one private phrase, so the PIN exists when you need it and nowhere else.
PIN generator FAQ
- What is the most secure 4-digit PIN?
- There is no single most secure PIN — the secure ones are simply the ones nobody picks on purpose. Avoid repeats (1111), counting runs (1234), mirrored pairs (1212), birth years, and any MMDD date. A randomly generated PIN sits outside all of those clusters, which is where the cheap attacks live.
- How many 4-digit PIN combinations are there?
- There are exactly 10,000 possible four-digit PINs, from 0000 to 9999. That sounds like plenty until you learn that the ten most common PINs cover about 20% of real-world choices, so a thief with three attempts and a good guess list does far better than 3 in 10,000.
- Is a 6-digit PIN much safer than a 4-digit PIN?
- Yes — 100 times safer against random guessing. A six-digit PIN has 1,000,000 combinations against 10,000 for four digits. Use six digits wherever the device allows it, particularly on phones, where an attacker who has the handset can take their time.
- Is this PIN generator safe to use?
- Yes. It runs entirely in your browser using crypto.getRandomValues, the cryptographic random source built into your operating system. The PIN is never transmitted, logged, or stored. You can turn off your connection and it still works.
- How do I remember a random PIN?
- Link it to something meaningless but vivid rather than to a date. Or use a system like MoolKey that recreates the same PIN on demand from one private phrase, so a forgotten PIN is a lookup rather than a bank branch visit.
More free tools
Every tool runs in your browser without an account. The generators, strength checker, and entropy calculator keep inputs local. The breach checker sends only a five-character hash prefix to Have I Been Pwned.
Password generator
A password generator creates a random string that no person would think of and no wordlist contains.
Passphrase generator
A passphrase is several random words joined together, such as "trout-canyon-mellow-drift".
Strength checker
A password strength checker estimates how many guesses an attacker needs before reaching your password.
Breach check
A breach check tells you whether a password already appears in leaked data.
Entropy calculator
Password entropy measures how many guesses an attacker needs, expressed in bits.
Make one account easier today.
Start with the password you keep reusing or the bank card that still shares a PIN. MoolKey is free, and you do not need to move everything at once.