Barcode Generator: Create UPC, EAN, Code 128 & Other Barcodes Online

Barcode Generator: Create UPC, EAN, Code 128 & Other Barcodes Online

Need to create a barcode for a product, SKU, inventory item, shipping label, carton, or testing workflow?
A barcode generator converts your data into a machine-readable barcode that can be scanned by compatible barcode readers and scanners.
CrazyTools4U's Barcode Generator Studio supports multiple popular barcode standards, including Code 128, UPC-A, EAN-13, EAN-8, Code 39, Codabar, and ITF-14.
You can generate a single barcode, create printable A4 barcode sheets for multiple SKUs, or generate up to 100 barcode codes in a batch and package the results into a ZIP archive.
Let's understand how barcodes work and how to choose the right barcode format.

What Is a Barcode?

A barcode is a machine-readable representation of data.
Traditional barcodes, also called 1D barcodes, use patterns of vertical bars and spaces to represent information. A barcode scanner reads this pattern and converts it back into the encoded data.

Barcodes are commonly used for:

1. Product identification
2. SKU labeling
3. Inventory management
4. Shipping and logistics
5. Warehousing
6. Manufacturing
7. Retail
8. Asset tracking
9. Packaging
10. Internal business systems

Different barcode standards are designed for different types of data and applications.
That's why choosing the correct barcode symbology is important.

What Is a Barcode Symbology?

A barcode symbology is the specific encoding standard used to convert data into a barcode.
Different symbologies have different rules for:

1. Supported characters
2. Data length
3. Check digits
4. Encoding structure
5. Intended applications
   For example, UPC-A is commonly associated with retail product identification, while Code 128 is useful for applications that need a broader character set.
   CrazyTools4U Barcode Generator Studio provides several symbology options from one interface.

Supported Barcode Formats

The Barcode Generator Studio currently provides these barcode standards:
Barcode Common Application
Code 128 Shipping, logistics & inventory
UPC-A North American retail
EAN-13 International retail
EAN-8 Smaller retail packages
Code 39 Alphanumeric industrial applications
Codabar Libraries & blood banks
ITF-14 Cartons and logistics
Let's look at each one.

Code 128

Code 128 is a high-density 1D barcode designed to encode a wide range of characters efficiently.

It is commonly useful for:

1. Shipping labels
2. Logistics
3. Inventory
4. Warehouses
5. Product tracking
6. Internal identification
   CrazyTools4U labels Code 128 as Universal Shipping & Logistics, making it a useful option when your workflow needs a flexible barcode format.

UPC-A

UPC-A (Universal Product Code-A) is a common retail barcode format.
A standard UPC-A represents 12 digits, including its check digit.
UPC-A is particularly associated with retail product identification in North America.
If you're creating a barcode for an actual retail product, don't assume that generating a UPC-A image automatically gives you an officially assigned product number. The identifier and the barcode image are two different things.

EAN-13

EAN-13 is a widely used retail barcode format internationally.
It represents 13 digits and is commonly found on retail products around the world.
If your marketplace or inventory system requires EAN-13, select the EAN-13 symbology rather than simply converting an unrelated barcode format.

EAN-8

EAN-8 is a shorter retail barcode format designed for applications where space is limited, such as smaller packages.
Its shorter structure can make it useful when a full-size retail barcode would be difficult to fit on the packaging.

Code 39

Code 39 is an alphanumeric barcode standard used in various industrial and organizational applications.
Unlike some retail-focused formats, Code 39 can represent letters as well as numbers, depending on the supported character set.

Codabar

Codabar is a 1D barcode symbology historically used in applications such as libraries and blood banks.
It is designed for specific identification and tracking workflows rather than being a general replacement for every retail barcode.

ITF-14

ITF-14 is associated with logistics and carton-level identification.
It is particularly useful in supply-chain environments where products are grouped into shipping cartons or cases.

What Is UPC-A?

UPC-A deserves special attention because it's one of the barcode formats people most commonly search for.
A UPC-A barcode normally contains 12 digits.

For example:
036000291452
This is a demonstration value and should not be treated as an assigned product identifier.
The final digit is the check digit, which is used to help detect certain errors in the barcode number.