A coupon code (also called a promo code, discount code, voucher code, or promotional code) is a string of characters — usually 5 to 15 letters or numbers — that an online shopper enters at the checkout step to reduce the total price of an order. The reduction can take several forms:
Codes are validated server-side by the merchant when entered. If valid (not expired, meets order conditions, hasn't hit usage cap), the discount applies before payment.
In practice these terms are interchangeable. Different brands use different conventions:
| Term | Common usage |
|---|---|
| Coupon code | Generic — works across most retailers |
| Promo code | Travel + entertainment platforms (Uber, Booking.com) |
| Discount code | Fashion + general retail (ASOS, SHEIN) |
| Voucher code | UK and European e-commerce |
| Promotional code | Formal label in T&Cs |
When you enter a code at checkout, the merchant's e-commerce platform sends a validation request to its backend. The backend checks four things:
If all four pass, the discount applies. If any one fails, you see "Invalid code" or a specific error like "Minimum order ₹1,499 required."
WELCOME10 — 10% off first orderFREESHIP — waives delivery feesSUMMER25 — 25% off summer collectionBLACKFRI — Black Friday weekend discountHDFC500 — bank-specific flat ₹500 offNEWUSER — first-purchase discountIf a code doesn't work at checkout, it's almost always one of these reasons:
Most coupon sites publish codes without verifying them. CouponHuntz tests every code before publishing — see how we verify for the operational process. Browse all coupons by brand or read the glossary for related terms.
A coupon code is a string of letters or numbers entered at online checkout to reduce the price of an order — typically as a percentage, flat amount, free shipping, or bundled offer.
In practice the terms are interchangeable. "Coupon code", "promo code", "discount code", and "voucher code" all refer to the same thing.
Common sources: brand newsletters, affiliate networks, coupon aggregator sites like CouponHuntz, browser extensions, social media sale announcements, and brand loyalty programs. Quality varies dramatically.
Brands cap promotional budgets by limiting code validity. Limits are time-bound, usage-capped, or single-use per account.
Most merchants allow only one promo code per order. But you can usually stack a coupon with bank offers, loyalty discounts, cashback platforms, and gift cards.
Most common reasons: expired, below minimum order value, payment method excluded, items in excluded category, or global usage cap reached.