Can You Check Expiration Dates Using a Barcode?

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What is a barcode and what does it represent?

A barcode is a series of parallel lines or a matrix pattern printed on product packaging that encodes information to identify that product uniquely. When scanned, the barcode reveals a product code that retail systems or apps use to look up details like the product name, price, and manufacturer. However, barcodes typically do not contain dynamic information such as an individual item's expiration or production date. Instead, they serve as a product identifier that groups all items of that type under a single code.

For example, a barcode on a box of cereal identifies the brand, type, and size of that cereal but not the specific batch or when it was packed or will expire. Expiration or best-by dates are usually printed separately on the box itself, often on the side or bottom.

How do expiration dates get recorded and displayed?

Expiration dates, best-by dates, or sell-by dates are printed by manufacturers during packaging. These dates inform consumers how long the product is expected to remain safe or at peak quality. Each package will have a date code printed in a specific format, such as MM/DD/YYYY or Julian dates, depending on the product and manufacturer practices.

These dates are not encoded in the barcode because expiration dates vary by production batch or even individual item, while a barcode identifies the general product type for scanning at sale. This separation means a barcode scan alone does not reveal expiration dates.

Can barcode scanning apps or systems provide expiration date info?

Some mobile apps or retailer inventory systems link barcode data with additional product information, including expiration dates, but only if that information is entered into a centralized database. For instance, a store may scan a product’s barcode and check their stock management system to find the expiration date for that particular batch.

However, for consumers scanning products at home, most barcode scanning apps do not have access to batch-specific expiration dates. They can give you product details, nutritional info, or reviews but rarely the expiration date unless the app is tied to the retailer’s inventory system or manufacturer’s database.

Hypothetical example

Imagine you scan the barcode on a carton of milk using a grocery store’s app. The app identifies the product as "Whole Milk 1 gallon." In the store’s system, this barcode links to several batches with different expiration dates. Without scanning a separate batch code or date stamp, the app can’t tell which batch your carton belongs to or its expiration date. The expiration date printed on the milk carton remains the definitive source.

Why does knowing expiration dates matter?

Expiration dates help you avoid consuming spoiled or unsafe foods, which can cause illness or reduce product quality. Consumers rely on printed expiration dates for safe food handling. Because barcodes alone don’t provide expiration details, reading the printed date on the packaging is essential.

Being able to confirm expiration dates before purchasing or consuming food protects your health and helps avoid food waste by using products before they expire. When shopping, if the printed date is missing or unclear, it’s better to ask a store employee or choose a different item.

What terms do people confuse with barcodes and expiration dates?

People sometimes confuse barcodes with QR codes or batch codes. QR codes can store more detailed information and may link to websites or product info but still rarely show expiration dates directly. Batch codes or lot numbers are printed separately and identify the specific production run; these can sometimes be used by manufacturers or retailers to track expiration dates internally.

Also, terms like “sell-by,” “use-by,” “best-by,” and “expiration date” vary in meaning:

• Sell-by: When the store should sell the product by.
• Use-by: The last recommended date for quality or safety.
• Best-by: When the product is at peak quality, not necessarily unsafe after.

Understanding these terms helps interpret the printed dates correctly.

What should you do next to check expiration dates effectively?

1. Always look for a clearly printed expiration or best-by date on the product packaging.
2. Learn how to read different expiration date formats — some manufacturers use codes rather than clear dates.
3. If buying packaged goods in a store, inspect the packaging carefully before purchase.
4. Use barcode scanning apps mainly for product info, not expiration dates.
5. When in doubt, ask store staff or contact the manufacturer, especially for perishable items.
6. For food safety, consult resources on how to check expiry dates on food products to deepen your understanding.

How can you handle products without clear expiration dates?

If a product’s expiration date is missing or illegible, it’s safer to avoid purchasing or consuming it. For fresh produce or bulk items, rely on sensory checks like smell, appearance, or texture. For packaged goods, you can check the manufacturer’s website or customer service for batch-specific info if you have the lot number.

Proper food storage also extends shelf life, so follow storage instructions carefully. If ever uncertain about food safety, discard the product rather than risk illness.

By understanding that barcodes do not directly reveal expiration dates and learning to find and interpret printed date codes, consumers can make safer, more informed choices about their food.

For more on reading expiration dates, see How to Read Expiration Dates on Food and Products and Expiration Date Checklist for Food Safety.

Frequently asked questions

Can I use a smartphone barcode scanner to find out if food is expired?

Most smartphone barcode scanners will only give you product details like name and ingredients, not expiration dates. Expiration dates are typically printed on the packaging and must be checked manually. Some specialized apps linked to store inventories might provide expiration info, but these are not common for consumers.

What is the difference between a barcode and a lot or batch number?

A barcode identifies the product type universally, helping retail systems track sales. A lot or batch number identifies a specific production run of that product, useful for tracking expiration dates or recalls. Lot numbers are printed separately from barcodes and are important for food safety tracking.

Why don’t manufacturers put expiration dates in barcodes?

Expiration dates vary by production batch and are dynamic information, while barcodes are designed to identify the product type consistently. Encoding expiration dates in barcodes would require a unique barcode for every item, complicating retail scanning and inventory systems.

How can I read different expiration date formats on food packaging?

Expiration or best-by dates may appear in formats like MM/DD/YYYY, DD/MM/YYYY, or Julian dates. Some use codes only understood by manufacturers. Look for clear labels like “EXP,” “Best By,” or “Use By” near the date, and consult resources to decode unusual formats.

Are QR codes better than barcodes for checking expiration dates?

QR codes can store more data and sometimes link to online product info, but they rarely contain expiration dates directly. Like barcodes, the expiration date is mostly found on packaging. QR codes may offer access to manufacturer websites where you can find additional product details.