Is this truly random?

Yes. The generator uses crypto.getRandomValues(), the browser's cryptographically secure random number generator. No Math.random() is involved.

Are the PINs sent to any server?

No. All generation happens in your browser. Nothing is transmitted or stored remotely.

What does "no sequential digits" mean?

Any PIN containing three or more consecutive digits in ascending order (e.g. 123, 456) or descending order (e.g. 987, 321) is discarded and a new one is generated.

Why is the entropy low for short PINs with constraints?

Applying constraints reduces the number of valid PINs. A 4-digit PIN with no repeats has 10x9x9x9 = 7290 possibilities (~12.8 bits), versus 10000 (~13.3 bits) unconstrained.

Secure PIN Generator

Name: Secure PIN Generator
Availability: InStock
Author: Nham Vu

Generate cryptographically random PINs of 4-12 digits with options to exclude repeating and sequential digits. Shows entropy bits and supports bulk generation.

Options

PIN Length 6

412

Quantity (bulk) 1

120

No repeating digits (e.g. avoid 1134)

No sequential runs (e.g. avoid 1234)

Estimated Entropy -- bits

Generated PINs

Configure options and click Generate PIN

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Summary

Generate cryptographically random PINs of 4-12 digits with options to exclude repeating and sequential digits. Shows entropy bits and supports bulk generation.

How it works

Digits are drawn one at a time using crypto.getRandomValues(). When "no repeating digits" is active, a newly drawn digit is discarded if it equals the preceding digit. When "no sequential digits" is active, the finished PIN is rejected if it contains a run of 3 or more ascending or descending consecutive digits; a fresh PIN is attempted until the constraint is satisfied or 1000 attempts are exhausted. Entropy is calculated as log2(eligible_combinations).

Use cases

Create a secure ATM or device PIN that avoids easy-to-guess patterns.
Generate temporary access codes for door locks or safes.
Produce test PINs for QA environments without reusing obvious sequences.
Bulk-generate PIN candidates for selection during system setup.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu