Numbers

PIN & Token Grid Generator

The PIN and token grid generator creates a batch of random codes displayed in a clean card layout, ready to copy, assign, or print in seconds. Set the code length, choose between numeric PINs or alphanumeric tokens, and pick how many codes you need — the generator handles the rest. All codes are displayed in a scannable grid format so you can distribute them at a glance without sorting through a wall of text. Numeric PINs work well for door access panels, locker assignments, and event wristbands where users need to punch in a short sequence. Alphanumeric tokens add entropy, making them better suited for voucher codes, referral links, or temporary login credentials where guessability matters more. One detail worth knowing: the generator strips out characters that look alike in print — O and 0, I and 1, and similar pairs. This matters enormously when codes are printed small or handed to users verbally, cutting down on 'was that a zero or an O?' support requests. For batch operations like printing raffle tickets or preloading access cards, this single decision saves real headaches.

How to Use

  1. Set the Code Length field to match how long you want each PIN or token to be.
  2. Select a Character Set: choose 'numeric' for keypad-friendly PINs or 'alphanumeric' for higher-entropy tokens.
  3. Enter the number of codes you need in the Grid Size field, then click Generate.
  4. Review the card grid and regenerate any batch that contains codes you want to replace.
  5. Use your browser's print function or copy individual codes directly from the grid for distribution.

Use Cases

  • •Printing raffle ticket codes for in-person events
  • •Generating locker PINs for a gym or school opening day
  • •Creating one-time voucher codes for a retail promotion
  • •Assigning random team codes for classroom group activities
  • •Pre-loading access card PINs for a new office floor
  • •Producing short tokens for a QR-code-free check-in sheet
  • •Batch-creating promo codes before a timed flash sale
  • •Issuing temporary Wi-Fi access tokens for conference attendees

Tips

  • →For printed handouts, use length 6 and numeric mode — shorter codes reduce transcription errors when attendees enter them on a keypad.
  • →Alphanumeric tokens at length 8 give over 2 trillion possible combinations, making brute-force guessing impractical for voucher systems.
  • →If you need codes with a consistent prefix (e.g., SALE-XXXXXX), generate the random portion here and manually prepend the prefix in your spreadsheet.
  • →Generate slightly more codes than you need — having 20% extra lets you retire codes that look awkward or are too similar to each other.
  • →For event check-in sheets, a grid of 12 codes at length 6 fits neatly on one printed page when the browser zoom is set to 80%.
  • →Avoid reusing the same batch across multiple events or promotions; regenerate a fresh grid each time to prevent code overlap and fraud.

FAQ

Why are characters like O, 0, I, and 1 removed from the codes?

These characters are visually ambiguous in many fonts, especially when printed small or handwritten. Removing them means users can read and type codes without second-guessing whether a character is a letter or a number. This is a standard practice in voucher and PIN systems to reduce entry errors and support calls.

How many codes can I generate at once?

The Grid Size input controls how many codes appear. The default is 12, but you can increase it to generate a larger batch in one click. For very large batches, generate multiple rounds and combine the results — each run produces a fresh, independent set.

What is the difference between numeric and alphanumeric codes?

Numeric codes use digits only (0-9, minus ambiguous characters), making them easy to enter on a keypad or phone number pad. Alphanumeric codes mix letters and numbers, dramatically increasing the number of possible combinations for a given length — better for vouchers or tokens where guessing resistance matters.

Can I print the generated grid directly?

Yes. Use your browser's print function (Ctrl+P or Cmd+P) while the grid is visible. The card layout is designed to translate cleanly to paper. For best results, print in landscape orientation if you have a large grid size selected.

Are these codes safe enough for access control or security systems?

The codes use JavaScript's Math.random(), which is not cryptographically secure. They are well-suited for low-stakes uses like event check-in, classroom activities, or promotional vouchers. For systems protecting sensitive data, user accounts, or financial transactions, use a cryptographically secure random source instead.

What code length should I use for voucher codes?

Six to eight characters is the industry standard for printed voucher codes — long enough to avoid easy guessing, short enough to type without errors. If codes will be entered on mobile devices, stay at six. If the code space needs to be large (millions of unique codes), go to eight or pair a shorter code with a fixed prefix.

How do I make sure codes in my batch are unique?

The generator produces statistically independent codes, so duplicates are possible but increasingly rare as code length grows. For a 6-character alphanumeric code, the pool is large enough that duplicates in a 12-50 code batch are extremely unlikely. For guaranteed uniqueness at scale, manually check the output or regenerate any obvious duplicates.