How this works in your browser
Codes are built by drawing characters from a restricted alphabet using the browser’s cryptographically secure random source, so the sequence is not predictable from previously generated codes. The alphabet deliberately excludes the characters people confuse, notably the letter O against zero and the letter I against one, because a promo code’s real failure mode is transcription rather than cryptanalysis: a customer misreading a code off a printed card abandons the purchase, while nobody is brute-forcing your discounts. Each code is generated independently with no shared state, which is why uniqueness should be enforced by whatever system stores them.
Who uses Coupon Code Generator
Running a promotion
Generate a batch of unique discount codes for a campaign.
Giveaways and competitions
Produce redemption codes to distribute to winners.
Event and conference offers
Create codes for printed cards or badges handed out in person.
Influencer and partner tracking
Use prefixed codes so each channel’s redemptions are identifiable.
Frequently asked questions
Why are some letters/numbers excluded?
Characters like O/0 and I/1 are excluded by default to avoid confusion when codes are read aloud or typed manually.
Are the generated codes guaranteed unique?
Each code is generated independently using a secure random source; with enough length, collisions are extremely unlikely.
Does this tool track or redeem codes?
No, this only generates code strings.
How long should a code be?
Eight characters is a sensible default for most promotions, giving an enormous space while staying short enough to read off a card. Go longer only if the codes will be guessed at rather than distributed, since every extra character is one more chance for a customer to mistype.
Could someone guess a valid code?
With reasonable length, no. But guessing is not really the risk with promo codes: the common failure is a code intended for one customer being posted to a deals site and used thousands of times. That is a redemption-limit problem in your store system, not something code generation can prevent.
Should I use a prefix?
Yes, when you are running more than one campaign. A prefix makes the source obvious at a glance in your reports and in support conversations, and it costs nothing in terms of the random space behind it.
Do I still need to check for duplicates?
For a large batch, yes. Each code is generated independently, so collisions are extremely unlikely but not structurally impossible. Your store system should treat codes as unique keys, which catches any duplicate automatically.