Barcode Guide
What Is a Barcode and How Does It Work?
A barcode is a machine-readable representation of information using a pattern of bars, spaces and, depending on the symbology, additional structural elements. A scanner reads the pattern and converts it into data that a computer system can use for identification, tracking, inventory or other workflows.
How to Create a Barcode for a Product
To create a barcode for a product, first determine which barcode format your application requires. Enter a valid product identifier or other data into the generator, select the appropriate barcode type, review the generated result, and download it as PNG or SVG. For products intended for retail sale, use a legitimately assigned product identifier rather than an arbitrary number.
How to Generate and Print a Barcode
To generate a barcode online, enter the value you need to encode, choose a barcode format such as CODE 128 or CODE 39, adjust the size and display options, and review the result before downloading. For printed labels, use a clear high-contrast design and test the final printed barcode with the scanner used in your workflow.
CODE 128 vs CODE 39
CODE 128 is a dense option for many logistics, shipping and general business data workflows. CODE 39 supports a defined alphanumeric character set and is commonly used in industrial and enterprise environments. The right format depends on the system, scanner and data requirements.
CODE 128 Barcode
CODE 128 is a high-density linear barcode designed to encode a broad range of characters efficiently. It is widely associated with logistics, shipping, warehouse and inventory applications. Its flexibility makes it a popular choice when you need to encode general business data in a relatively compact symbol.
CODE 39 Barcode
CODE 39 is an alphanumeric barcode that is widely recognized in industrial and enterprise environments. It can encode letters, numbers and a defined set of special characters. Because it is less dense than some alternatives, the final symbol may require more physical space for the same amount of information.
EAN-13 and EAN-8 Barcodes
EAN formats are commonly associated with retail product identification. EAN-13 uses 13 digits, while EAN-8 is a shorter format intended for smaller products. A barcode generated for a real retail product should use an identifier assigned through the appropriate standards organization or supply-chain process rather than an arbitrary number.
UPC-A Barcode
UPC-A is a widely used retail barcode format, especially in North America. It uses a structured numeric identifier. If you are creating a barcode for commercial retail distribution, make sure the number is valid and officially assigned where required.
ITF-14 Barcode
ITF-14 is commonly used to identify trade items and shipping containers in supply-chain environments. It is designed for applications where a robust, relatively simple linear symbol is appropriate.
Barcode Quiet Zones
The quiet zone is the clear area around a barcode. It helps scanners distinguish the symbol from surrounding graphics, text and borders. When printing, avoid placing other design elements too close to the barcode. The exact required quiet zone depends on the symbology and application.
Barcode Size and Scanning Distance
There is no single perfect barcode size. The correct dimensions depend on the symbology, data length, scanner, printing technology and scanning distance. A barcode that looks sharp on a monitor may not scan after being printed too small or with insufficient contrast.
Barcode Color and Contrast
Dark bars on a light background remain a reliable default. Color combinations should provide sufficient optical contrast. Decorative colors can work in some cases, but always test the finished barcode using the actual scanner and lighting conditions.
Human-Readable Text
Human-readable text makes it easier for people to identify or manually enter the encoded value if scanning is temporarily unavailable. Whether the text should be shown depends on your workflow and the requirements of your label or product design.
Static Barcode vs Database Record
A barcode generally stores an identifier or data value. It does not automatically create a product record, inventory system or online database. For a real business workflow, the scanned value normally needs to be connected to software that knows what the identifier represents.
Testing Before Production
Always test a barcode before mass printing. Test the exact final output, including the paper, label material, printer, size and scanner. A barcode can be technically valid yet fail in practice because of low print quality, insufficient contrast, distortion, cropping or inadequate quiet zones.