PIN Generator — Secure Random PIN Codes Online
Generate a secure random PIN for your ATM card, phone, locker, or safe. Choose 4–12 digits, block repeats and sequential runs, check any PIN’s strength, and learn exactly how long each PIN length survives a brute-force attack.
100% client-side · crypto.getRandomValues · nothing stored or sentGenerate a secure PIN
Every digit comes from your browser’s cryptographically secure generator (crypto.getRandomValues), sampled with zero modulo bias. Common PINs like 1234 and 1111 are never issued.
Check your current PIN
Wondering if the PIN you already use is guessable? Type it below — it never leaves your device.
What makes a PIN secure?
A secure PIN has two properties: it is unpredictable and it is paired with lockout. Unpredictability comes from true randomness — every one of the 10,000 possible 4-digit PINs must be equally likely, with no human bias toward birthdays or keyboard patterns. Lockout is what makes short PINs viable at all: an ATM that freezes the card after 3 wrong tries turns a 4-digit PIN into a 3-in-10,000 gamble (0.03%), which is why banks are comfortable with 4 digits.
Where there is no lockout — an offline stolen database, a safe with unlimited tries — only length protects you, and the math is brutal. The table below shows the average brute-force time (half the keyspace) for each PIN length under two scenarios: a throttled online attacker managing 10 guesses per second, and an offline attacker with a billion guesses per second.
Combinations and average brute-force time per PIN length
| Digits | Combinations | Entropy (bits) | Avg. crack: online, throttled 10/s | Avg. crack: offline, 1B/s |
|---|---|---|---|---|
| 4 | 10,000 | 13.29 | 8.3 minutes | 5.0 microseconds |
| 6 | 1,000,000 | 19.93 | 13.9 hours | 500.0 microseconds |
| 8 | 100,000,000 | 26.58 | 57.9 days | 50.0 ms |
| 10 | 10,000,000,000 | 33.22 | 15.8 years | 5.0 seconds |
| 12 | 1,000,000,000,000 | 39.86 | 1,584.4 years | 8.3 minutes |
Two lessons: with a 3-strike lockout, even 4 digits are practically unguessable online (8.3 minutes of throttled guessing buys only ~5,000 of 10,000 combos, and the lockout fires after 3). Without lockout, every 2 extra digits multiply survival time by 100 — an 8-digit PIN buys 57.9 days where a 4-digit PIN buys 8.3 minutes.
What “no repeated digits” costs you
Forbidding digit reuse shrinks the keyspace (you draw from 10 × 9 × 8 … instead of 10n), but it deletes exactly the patterns attackers try first:
| Digits | Combinations (no repeats) | Entropy (bits) |
|---|---|---|
| 4 | 5,040 | 12.30 |
| 6 | 151,200 | 17.21 |
| 8 | 1,814,400 | 20.79 |
| 10 | 3,628,800 | 21.79 |
A 6-digit no-repeat PIN still has 151,200 combinations and 17.21 bits of entropy — and zero doubles, triples, or familiar pairs for an attacker to exploit.
The PINs attackers try first
A study of 3.4 million real-world PINs (DataGenetics) found the 20 most common PINs account for 26.83% of all PINs in use. The top 10: 1234, 1111, 0000, 1212, 7777, 1004, 2000, 4444, 2222, 6969. This generator refuses to issue any of the top-20 common PINs, all-identical PINs, or year-like patterns — the first guesses in every attacker’s dictionary.
Shoulder surfing: the attack no math stops
The most common real-world PIN theft isn’t brute force — it’s someone watching you type. Shield the keypad with your free hand at ATMs and checkout counters, stay aware of security cameras and onlookers, and never say a PIN out loud or enter it where your screen is mirrored or recorded.
What NIST says
NIST Special Publication 800-63B (Digital Identity Guidelines) explicitly permits short memorized secrets — including 6-digit PINs — when the verifier rate-limits guesses and locks out attackers. It also retired mandatory periodic password/PIN changes: change a PIN only when there is evidence of compromise (someone watched you enter it, a device was lost, a breach was announced), because forced rotation pushes people toward weaker, predictable choices.
Worked examples
Example 1 — Generate a 6-digit no-repeat PIN
Settings: length 6, no repeated digits, no sequential runs. One draw from the generator: 103468.
Entropy: log₂(10 × 9 × 8 × 7 × 6 × 5) = log₂(151,200) = 17.21 bits. Average brute force: 151,200 ÷ 2 = 75,600 guesses → 2.1 hours at a throttled 10 guesses/second.
Example 2 — Why “123456” scores 0
The checker flags 123456 with: on the most-common PIN list — attackers try this first; contains a sequential run (like 123 or 321). It sits on every attacker’s first-try list and contains an ascending run, so its effective security is near zero despite having 1,000,000 theoretical combinations.
Example 3 — The 3-strike lockout math
ATM scenario: 4-digit PIN, card locks after 3 wrong attempts. Attacker success probability = 3 ÷ 10,000 = 0.03%. Even the weakest random 4-digit PIN (say 0096) is safe here — which is exactly why banks pair short PINs with lockouts instead of demanding longer ones.
Example 4 — Spotting a birthday PIN
The checker flags 251299: looks like a full date (DDMMYY or MMDDYY) — never use birthdays or anniversaries. Anyone who knows your birthday — or finds your ID — tries date formats within the first dozen guesses. Never encode a birthday, anniversary, or address into a PIN.
Practical tips
- Memorize, don’t store. Never keep a PIN in your phone’s notes app, a photo, or a wallet note next to the card it protects.
- One PIN per device. Reusing the same PIN on your phone, ATM card, and gym locker means one shoulder-surf compromises all three.
- Type with cover. Shield the keypad with your other hand every single time — muscle memory beats vigilance.
- Longer for no-lockout systems. Safes, bike locks, and luggage locks often allow unlimited tries: use 6–8 digits there.
- Change only on suspicion. Per NIST guidance, rotate a PIN when it may have been seen — not on a calendar schedule.
Frequently asked questions
1. How do I generate a secure PIN?
Use a generator backed by a cryptographically secure random number generator — this tool uses your browser’s crypto.getRandomValues, so nothing is sent or stored anywhere. Pick 6 or more digits, turn on “no repeated digits” and “no sequential runs”, then memorize the result and never reuse the same PIN on two devices.
2. How long should my PIN be?
It depends on the lockout policy. A 4-digit PIN is fine for ATMs because the card locks after 3 wrong tries (an attacker’s chance is just 3 in 10,000, or 0.03%). For phones, lockers, and safes, use 6 digits. For high-security systems without lockout, use 8 or more — the combinations table below shows why.
3. Why shouldn’t I use my birthday as a PIN?
Because dates are the first thing an attacker tries after 1234 and 1111. Anyone who knows you — or finds your ID — can guess DDMM, MMDD, or YYMMDD in a handful of attempts. The generator’s “avoid dates” option rejects year-like and calendar-like patterns automatically, and the checker warns you if a PIN looks like a date.
4. What are the most common PINs to avoid?
A study of 3.4 million real PINs (DataGenetics) found the top 20 PINs cover 26.83% of all PINs in use. The worst offenders: 1234, 1111, 0000, 1212, 7777, 1004, 2000, 4444, 2222, and 6969. This generator never outputs any of the top-20 common PINs.
5. Is a 4-digit PIN safe?
With a 3-strike lockout, yes: the attacker gets 3 guesses out of 10,000 (0.03%). Without lockout — for example an offline stolen password hash — a 4-digit PIN falls in about 5 microseconds at a billion guesses per second. That is why banks pair short PINs with lockouts, and why longer PINs matter where no lockout exists.
6. What does “no repeated digits” do to security?
It forbids reusing any digit, which shrinks the keyspace a little (a 6-digit PIN goes from 1,000,000 to 151,200 combinations, 19.93 to 17.21 bits) but eliminates exactly the patterns attackers try first — doubles, triples, and familiar pairs. The trade is worth it: unpredictability beats raw keyspace.
7. Are my generated PINs stored or sent anywhere?
No. The generator runs 100% in your browser using crypto.getRandomValues. No request is made, no cookie is set, and no server ever sees your PIN. For maximum safety, memorize it and don’t screenshot the result.
8. How does the strength meter work?
It starts from the PIN’s entropy in bits — log₂ of the keyspace (a random 6-digit PIN has 19.93 bits, a 12-digit PIN 39.86 bits) — scaled so 22 bits scores 100. Then it subtracts 35 points per critical issue (common PIN, sequential run, all-same digits, date-like pattern) and 10 for adjacent repeated digits.
9. What is the difference between a PIN and a password?
A PIN is short and numeric by design, and it is always paired with throttling or lockout — that is what makes 4 digits acceptable at an ATM. A password draws from a larger alphabet and usually has no lockout, so it needs more length. NIST SP 800-63B explicitly allows short memorized secrets like 6-digit PINs when rate-limiting is in place.
10. Can someone brute-force my PIN?
Online with a lockout: practically no — 3 tries per lockout makes even a 4-digit PIN a 0.03% gamble. Offline against a stolen hash with no throttling: yes, and fast — see the crack-time table. The defense is length plus lockout, never secrecy of the method.
11. Should I change my PIN regularly?
No — forced rotation is outdated advice. NIST SP 800-63B recommends changing a memorized secret only when there is evidence of compromise (someone watched you type it, a device was lost, a breach was announced). Arbitrary expiry just pushes people toward weaker, predictable PINs.
12. What is shoulder surfing and how do I stop it?
Shoulder surfing is watching — directly or via camera — as you type your PIN. Defend against it by shielding the keypad with your other hand, being aware of cameras and onlookers at ATMs and checkout counters, and never saying your PIN out loud or typing it where a screen is mirrored.
Free tool by NRTechStudio