Lot Date is a cosmetic batch code and lot number lookup service designed to help people understand the age and freshness of personal care products. Its online checker supports more than 3,500 brands across cosmetics, skincare, fragrance and haircare. Users select a brand and enter the code exactly as it appears on the package to receive an estimated production date and related expiry context.

The service also provides guidance on interpreting printed expiration dates and period-after-opening symbols, locating batch codes, distinguishing manufacturing codes from barcodes and shade numbers, and checking different product types, including perfume, makeup, skincare, haircare and sunscreen. Its searchable brand directories make it easier to find supported manufacturers, while task-based guides explain common date-label questions and how to investigate results that seem inconsistent.

Lot Date emphasizes that batch-code results are estimates, not proof of product authenticity, safety or quality. It advises users to follow printed expiration dates and storage directions, consider the PAO label and product condition, and contact the brand when a code or date result remains unclear. The service also offers an app with additional features, including saved products and reminders.