If you manage a mailroom or receiving operation, barcodes are part of your daily workflow whether you think about them or not. Every package that arrives from a carrier has a barcode that identifies it, and whether your scanning equipment can read that barcode quickly and accurately affects how fast packages move through your operation. Understanding the difference between 1D and 2D barcodes helps you make better decisions about scanning hardware and package tracking software for your mailroom.
What Is a 1D Barcode?
One-dimensional barcodes, also called linear barcodes, are the traditional format most people recognize: a series of parallel black lines and white spaces that encode data horizontally. The variation in line width and spacing represents alphanumeric characters that a barcode scanner reads by passing a laser or light beam across the pattern left to right.
The most common 1D formats in shipping and logistics are Code 128 and Code 39. Most major carrier shipping labels, including UPS, FedEx, and most regional carriers, use Code 128 as their primary tracking number barcode. The Universal Product Code (UPC) found on retail products is another well-known 1D format.
The practical limitation of 1D barcodes is data capacity. A 1D barcode typically holds 20 to 25 alphanumeric characters, which is enough to encode a tracking number but not much additional routing or service information.
What Is a 2D Barcode?
Two-dimensional barcodes encode data in both horizontal and vertical directions using a grid of squares, dots, or hexagons. This matrix structure allows them to store far more information in a smaller physical space than a 1D barcode can.
The most widely recognized 2D format is the QR code. In logistics and package tracking, Data Matrix codes are common on shipping labels because they remain readable even when partially damaged or obscured. PDF417 appears frequently on USPS labels and some FedEx service labels, encoding additional routing and service information that supplements the main tracking number barcode.
A 2D barcode can hold several hundred to several thousand characters, which allows it to encode full routing information, postal codes, service class, and other details that a 1D barcode cannot accommodate.
How Both Types Appear Together on Carrier Labels
Most carrier shipping labels include both barcode types. The large barcode along the top or middle of a UPS or FedEx label is typically a 1D Code 128 barcode encoding the primary tracking number. Smaller 2D barcodes elsewhere on the label encode additional routing and service data for carrier sorting systems.
For mailroom package logging purposes, reading the 1D tracking number is typically all that is needed to log a package in your tracking system. However, some carriers and routing workflows use 2D barcodes for supplemental data, and your scanning hardware should handle both formats reliably.
What This Means for Your Mailroom Scanning Setup
A mailroom receiving packages from multiple carriers encounters both 1D and 2D barcodes throughout every shift. The key questions for your scanning setup are straightforward.
Can your scanners read both formats? Older linear barcode scanners read only 1D barcodes. Modern 2D area imagers read both types, which makes them the better choice for any multi-carrier receiving environment. If your current hardware struggles with certain carrier labels, upgrading to a 2D imager resolves most scanning errors immediately.
Does your package tracking software identify the carrier and recipient automatically from the scan? Reading a barcode is only useful if the software knows what to do with the data. TekTrack’s SmartScan™ technology reads barcodes from any carrier and automatically identifies the intended recipient from the package data, without requiring staff to manually enter or look up any information. See the full list of TekTrack features.
What happens when a barcode is damaged or unreadable? Both 1D and 2D barcodes can become unreadable due to damage, moisture, or poor print quality during transit. Your package tracking system should have a fallback process for generating a new tracking label for packages that arrive without a scannable barcode, so every package stays documented regardless of label condition.
Scanning Speed: A Practical Consideration for High-Volume Mailrooms
One practical advantage of 2D barcodes is omnidirectional reading. A 1D barcode must be oriented correctly relative to the scanner’s beam to be read accurately. A 2D barcode can be scanned from any angle, which speeds up the process when staff are handling packages quickly at a busy receiving counter.
In a mailroom processing dozens or hundreds of packages per shift, the difference between needing to orient each package for scanning versus reading it from any angle accumulates to meaningful time savings over the course of a day.
The Bottom Line for Mailroom Operations
Whether a package arrives with a 1D or 2D barcode, your mailroom system should handle it without requiring staff to know or care about the distinction. The goal is to scan the package, log it in the system, notify the recipient, and move to the next package. The barcode format is a technical detail that your software and hardware should manage invisibly.
If your current setup struggles with certain carrier barcodes, requires manual entry when labels cannot be read, or does not automatically identify recipients from the scan, those are workflow problems with direct solutions. Read about TekTrack’s automation capabilities or contact us to see how SmartScan™ handles multi-carrier scanning in your environment.