Code 128 vs Code 39: Barcode Differences

Quick Comparison: Code 128 and Code 39

When you look at barcodes, they might all seem the same. But Code 128 and Code 39 have important differences. These differences matter for your business. Let’s explore what makes each barcode special.

What Makes These Barcodes Different?

Data Storage Capacity

Code 128 can store many types of information. It can hold any keyboard character. This includes uppercase letters (A-Z). It includes numbers (0-9). It also includes special symbols like @, #, and !.

Code 39 has limits. It only uses uppercase letters. It uses numbers. It includes seven special symbols: asterisk (*), hyphen (-), forward slash (/), percent (%), dollar sign ($), period (.), and plus (+).

Think of it like this:

• Code 128 is like a modern smartphone. It handles text, pictures, and videos.
• Code 39 is like an old flip phone. It handles calls and texts only.

Physical Size Requirements

Space matters when printing barcodes. Code 128 is compact. It packs data tightly. This makes it great for small items.

Code 39 needs more space. It requires about 30% more space than Code 128. The bars are wider. This makes it less suitable for small products.

Imagine comparing these:

• Code 128 is like folding clothes neatly into a small suitcase
• Code 39 is like packing bulky winter jackets into the same suitcase

Error Detection Capabilities

Mistakes happen. But some barcodes catch errors better than others. Code 128 has strong error checking. It works like a spell checker. It flags when something looks wrong during scanning.

Code 39 has basic error checking only. It gives simple yes/no answers. It doesn’t always catch mistakes.

When to Use Each Barcode Type

Code 128 Is Perfect For:

1. Shipping labels on small packages
2. Medical supplies (need exact details)
3. Store products with expiration dates
4. Anywhere space is limited
5. Logistics tracking systems
6. Inventory management with detailed information
7. Warehouse operations with tight space constraints

Code 39 Works Best For:

1. Employee ID badges
2. Library book tracking
3. Car part numbers
4. Simple inventory systems
5. Basic product identification
6. Manufacturing floor tracking
7. Asset management with simple requirements

Did you know? NASA uses Code 39 for some spacecraft parts labeling!

FAQ

Which barcode is easier to print?

Code 39 is simpler for DIY printing. Its basic bars work on standard printers. Code 128 might need special printer settings or higher quality equipment for best results.

Can Code 39 use lowercase letters?

No. Code 39 only supports UPPERCASE letters. If you need to distinguish between “a” and “A”, use Code 128 instead.

Why do some businesses use both barcode types?

Large retailers might use Code 128 for products (needing small labels) but Code 39 for shelf tags (easier to print on demand). Different applications require different solutions.

Do they scan differently?

Most modern scanners read both types automatically. However, always test your specific scanner with your barcode format before full implementation to ensure compatibility.

Which barcode format is more cost-effective?

Cost is generally similar for both formats. However, Code 39 can save money when printing large volumes of simple labels on basic equipment. Code 128 might require more expensive printers but saves on label space.