Random PIN Generator

Generate a secure random PIN code. Set the length below — 4, 6 or 8 digits are the usual choices.

Choosing a secure PIN

A four-digit PIN has only 10,000 combinations (10⁴), and a handful of them — 1234, 0000, 1111, 2580 — cover a large share of real-world PINs. Because attackers guess those first, a randomly generated PIN is dramatically safer even at the same length. Where the system allows it, choose six or eight digits.

The reason a random PIN closes that gap without changing its length is the same rejection-sampling logic described below: every one of the 10,000 (or million, or hundred million) possible values is equally likely to be produced, so there is no shortcut that lets an attacker try the common ones first and expect a better-than-even chance. A human picking a PIN unconsciously favors dates, repeated digits and keypad shapes; a cryptographically random draw has no such bias, which is the entire practical benefit of using a generator instead of typing one in.

What a PIN protects — and where it belongs

A PIN's security does not come primarily from its own size — it comes from the device or terminal limiting how many guesses are allowed. A phone lock screen or a debit card terminal locks you out (or wipes the device) after a handful of wrong attempts, which is what makes a 10,000-value search space acceptable. That is why PINs belong on device lock screens, SIM cards and payment cards, where hardware enforces the attempt limit — and why a PIN must never be reused as an online account password. A website login has no hardware backstop; an automated script can attempt far more than a phone's five or ten tries unless the site itself throttles logins, and many don't reliably. Numerically, an 8-digit PIN is 8 × log2(10) ≈ 8 × 3.32 ≈ 26.6 bits of entropy, while a 16-character password with letters, digits and symbols (see the 16-character generator) is roughly 16 × log2(91) ≈ 104 bits — a difference of about 2⁷⁷, an unfathomably larger search space. That gap is the reason online accounts need full-character-set passwords, not PINs, regardless of how many digits the PIN has.

PIN length comparison: 4 vs. 6 vs. 8 digits

Common mistakes that undo a PIN

• Using a birth year, address number, or anniversary — these cluster around a small, guessable set of values.
• Repeated or sequential digits, or a straight line on the keypad (0000, 1111, 1234, 2580).
• Reusing the same PIN across a card, a phone and a door code — one exposure compromises all three.
• Writing the PIN on or near the card or device it unlocks.
• Not changing the PIN immediately after a card or device is lost or stolen.
• Entering the PIN in public without shielding the keypad from onlookers.

How the randomness is produced

Each digit is drawn with window.crypto.getRandomValues(), the browser's cryptographically secure random number source, using rejection sampling so every digit 0–9 has an exactly equal chance of appearing. The PIN is generated entirely inside your browser tab — nothing is sent to a server, logged, or stored. See the Security page for how to verify this yourself, and the Methodology page for the full combinatorics.

Need a full password instead?

Use the random password generator for letters and symbols, or the 16-character generator for account logins.