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Alphanumeric Code Generator

Used by developers, writers, and creators worldwide.

An alphanumeric code generator is the fastest way to produce random strings of letters and numbers for vouchers, invite codes, reference IDs, and any short unique identifier. Set the count, choose a length between 8 and 16 characters, and toggle uppercase-only output — uppercase removes the classic transcription errors between lowercase 'l', '1', uppercase 'O', and zero that frustrate users every day. Eight uppercase characters gives you over two trillion possible combinations, which covers most promotional campaigns, referral programmes, and order numbering systems comfortably. Need tighter uniqueness for a larger user base? Bump the length to 12 or 16. Copy the list and paste it straight into a spreadsheet, CRM, or seed script.

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How to use

  1. Choose your options above
  2. Click Generate
  3. Copy your result

Detailed instructions

  1. Set the count field to the number of codes you need, up to the maximum allowed.
  2. Set the length field — use 8 for standard promo codes, 12 or more for high-volume or long-lived IDs.
  3. Choose 'Yes' for uppercase only if codes will be typed manually; choose 'No' for mixed case if they will only be copied and pasted.
  4. Click Generate and review the list of codes that appears in the output panel.
  5. Copy the full list and paste it into your spreadsheet, CRM, or database import file.

Use Cases

  • •Generating 500 discount codes for a Shopify seasonal sale and importing them via CSV
  • •Creating uppercase invite codes for a closed-beta SaaS app seeded into a Postgres users table
  • •Producing order reference numbers for a WooCommerce store that need to print cleanly on receipts
  • •Seeding a Jest or Cypress test fixture with 100 unique-looking alphanumeric identifiers
  • •Building one-time access codes for a webinar registration system managed in Notion or Airtable

Tips

  • →For voucher campaigns, generate 20-30% more codes than you expect to need — having spares avoids a second generation run mid-campaign.
  • →Avoid code lengths below 6 characters for any public-facing use; short codes are easy to brute-force by trial and error on checkout forms.
  • →If your platform bans certain words formed by letter combinations, run the output through a profanity filter before distributing codes to customers.
  • →Pair a 6-character code with a short fixed prefix (e.g. SUMMER-XXXXXX) to make codes feel branded while keeping the random portion statistically unique.
  • →When seeding a test database, generate codes at the same length and case setting your production system uses — mismatched formats can mask validation bugs during QA.
  • →Export the generated list immediately; browser state is not saved, and refreshing or regenerating will produce a completely new set of codes.

FAQ

how do I generate bulk voucher codes without duplicates

Set the count to the number of codes you need, pick a length of 8 or more, and click generate. Each code is independently randomised, so same-batch collisions are statistically negligible at typical campaign sizes. For absolute safety, paste the output into a spreadsheet and run a duplicate check before importing into your CRM or e-commerce platform.

are alphanumeric codes generated here safe to use as database IDs

They work well as human-facing reference IDs if you add a UNIQUE constraint on the database column — the generator minimises collisions probabilistically, but only a constraint guarantees them. For security-critical tokens like password resets, use a server-side function such as crypto.randomBytes in Node.js or secrets.token_urlsafe in Python instead.

what length should a promo code be

Eight uppercase characters is the standard sweet spot — it fits on a printed receipt, is short enough to type without errors, and offers over two trillion combinations. Go to 10–12 characters if your campaign has a very large user base or if codes are long-lived and you want collision probability to stay negligible as issuance grows.