Coupon Code Generator
A coupon code generator creates unique, randomized promo codes for e-commerce stores, marketing campaigns, and loyalty programs. Each code is built from a cryptographically secure random source (Web Crypto API), ensuring unpredictability and preventing brute-force guessing. You can control the code length, quantity, optional prefix, character set, and whether to exclude visually ambiguous characters like O, 0, I, l, and 1.
Dashes can be inserted at a fixed interval (e.g., every 4 characters) to make codes easier for customers to read and type. Codes are generated entirely in the browser — no data is sent to any server. Once generated, you can copy individual codes or copy the entire list to the clipboard with a single click for import into your platform.
How it works
Each character position is filled by drawing a random 32-bit integer from crypto.getRandomValues(), then taking modulo of the character-pool size. For a pool of N characters and code length L, the entropy is L × log₂(N) bits. Example: 8-character alphanumeric (no ambiguous) gives 8 × log₂(32) = 40 bits of entropy.
Use cases
- Generating discount codes for Shopify, WooCommerce, or custom checkout flows
- Creating unique referral codes for affiliate or influencer marketing programs
- Producing one-time-use promo codes for email newsletter campaigns
- Building batch voucher codes for gift cards or event tickets
- Generating API keys, temporary passwords, or access tokens for testing