How to Choose the Right 4×6 Shipping Labels – Complete Australian Buying Guide

Choosing the right shipping labels is essential for smooth order processing, reliable barcode scanning and efficient dispatch.

Whether you're running an online store, managing a warehouse or sending parcels through Australia Post, choosing the correct label size, roll quantity and core size can help prevent printing problems and unnecessary costs.

In this guide, Blumax explains everything you need to know about choosing 100×150mm (4×6) direct thermal shipping labels.

1. What Are 4×6 Shipping Labels?

4×6 shipping labels are approximately 100×150mm in size and are among the most widely used shipping label formats for eCommerce and warehouse applications.

They provide enough space for shipping addresses, tracking barcodes, courier information and delivery instructions.

Common applications include:

Australia Post parcel shipping
StarTrack freight and parcel labels
Aramex and CouriersPlease shipments
Shopify, eBay and Amazon orders
Warehouse dispatch and fulfilment

Important: The exact label format required depends on your courier, shipping software and printer settings.

2. Choosing the Right Number of Labels per Roll

Blumax offers several 100×150mm direct thermal label options to suit different printing requirements.

Labels per roll	Core size	Typical application
300 labels	25mm	Small businesses and regular eCommerce shipping
350 labels	40mm	General business and warehouse shipping
500 labels	25mm	Higher-volume shipping with a compatible roll holder
500 labels	40mm	Regular dispatch and medium-volume fulfilment
1,000 labels	76mm	Industrial and warehouse label printing

Choosing a larger roll can reduce how often you replace labels, but only if your printer or external roll holder supports the roll dimensions and weight.

Buying tip: Always check your printer's maximum roll diameter and supported core size before purchasing.

3. Understanding Shipping Label Core Sizes

The core is the cardboard or plastic tube in the centre of a label roll.

Blumax supplies 100×150mm labels with different core sizes.

25mm Core

Suitable for many desktop thermal label printers and external roll holders designed for small-core rolls.

40mm Core

Useful for printers and holders that accommodate a larger core. Always verify your printer's specifications.

76mm Core

Commonly used with industrial thermal label printers and large-capacity warehouse printing systems.

The core size does not change the actual shipping label dimensions. It determines how the label roll fits into your printing equipment.

4. Roll Labels vs Fanfold Labels

Both roll and fanfold shipping labels can provide the same 100×150mm printing area, but they feed into the printer differently.

Roll Shipping Labels

Labels are wound around a central core.

Advantages:

Convenient for compatible desktop and industrial printers
Available in different roll quantities
Easy to store and replace
Suitable for regular dispatch operations

Fanfold Shipping Labels

Fanfold labels are folded into a continuous stack rather than wound onto a core.

Advantages:

No roll core required
Convenient for compatible printers using external feeding
Suitable for high-volume shipping
Reduces roll replacement interruptions when using large stacks

Blumax also offers 100×150mm fanfold shipping labels in 4,000-label configurations.

Which should you choose?

Choose roll labels if your printer holds label rolls internally or through a compatible external holder.

Choose fanfold labels if your printer supports rear or external feeding and you want to minimise label changes.

5. Direct Thermal vs Thermal Transfer Shipping Labels

Two common thermal printing technologies are direct thermal and thermal transfer.

Direct Thermal Labels

Direct thermal labels use heat-sensitive material and do not require an ink ribbon.

They are widely used for parcel labels, courier labels and short-term warehouse applications.

Best suited for:

Shipping and dispatch labels
eCommerce orders
Short-term identification
Everyday parcel processing

Thermal Transfer Labels

Thermal transfer printing uses a ribbon to transfer an image onto the label surface.

Depending on the label material and ribbon combination, thermal transfer printing can provide better resistance to heat, abrasion and long-term storage conditions.

Best suited for:

Long-term barcode identification
Industrial and warehouse applications
Asset identification
Applications needing more durable print

For most ordinary parcel shipping applications, direct thermal labels are a practical and cost-effective choice.

6. Will 4×6 Shipping Labels Work with My Printer?

Before purchasing, check the following:

Label width: Your printer must support labels approximately 100mm wide.
Printing method: Check whether the printer requires direct thermal or thermal transfer labels.
Core size: Confirm which roll cores your printer supports.
Maximum roll diameter: Large rolls may require an external holder.
Feeding method: Confirm whether the printer supports roll labels, fanfold labels or both.
Software settings: Set the correct label dimensions in your shipping or printing software.

Popular thermal printer brands include Zebra, Brother, Rollo and other desktop and industrial printing systems.

Compatibility depends on the specific printer model, not simply the brand name.

7. Printing 4×6 Shipping Labels from Shopify, eBay and Amazon

Many online sellers use 4×6 thermal shipping labels to prepare parcels.

The general process is:

Create or purchase a shipping label through your selling platform or courier.
Select the correct thermal label printer.
Set the paper size to the shipping label format required.
Confirm the correct orientation and scaling.
Print a test label.
Check that the barcode is complete and clearly printed.

For Australian eCommerce sellers, always follow the label format supplied by your shipping service or carrier.

Avoid resizing a shipping label in a way that could distort the barcode or cut off important delivery information.

8. Choosing Shipping Labels for Different Business Sizes

Small eCommerce Business

A 300-label roll may be convenient for sellers who dispatch a modest number of parcels each day.

Growing Online Business

A 350-label or 500-label roll may reduce the frequency of label changes, provided it fits the printer setup.

Warehouse and Fulfilment Centre

High-volume operations may benefit from 1,000-label industrial rolls or fanfold stacks containing thousands of labels.

The best option depends on your daily shipping volume, printer specifications and available workspace.

9. Common Mistakes When Buying 4×6 Shipping Labels

Buying the wrong core size

A label roll may have the correct width but still be unsuitable for your printer.

Ignoring the maximum roll diameter

A large roll might not fit inside a desktop thermal printer.

Choosing the wrong label material

Direct thermal and thermal transfer labels are not interchangeable for every printing setup.

Assuming all 4×6 labels are identical

Label quality, adhesive performance, core size, roll quantity and printer compatibility can vary between suppliers.

Using incorrect printing settings

Poor scaling or paper-size settings may result in incomplete labels or unreadable barcodes.

10. Frequently Asked Questions

Are 4×6 labels the same as 100×150mm labels?

They are commonly treated as equivalent for shipping applications, but the exact metric conversion of 4×6 inches is 101.6×152.4mm. Check the required label dimensions and printer tolerances before buying.

Do direct thermal shipping labels need ink?

No. Direct thermal printers use heat-sensitive labels and do not require ink or toner.

Can I use a 1,000-label roll in a desktop printer?

Only if the printer or compatible external roll holder supports the roll's core size, diameter and weight.

Are fanfold labels better than roll labels?

Neither is universally better. Fanfold labels can be convenient for higher-volume external feeding, while rolls are practical for printers with built-in roll holders.

Can I print Australia Post shipping labels on a thermal printer?

Yes, when you use a compatible printer, correctly sized labels and the shipping format supported by the relevant Australia Post service or software.

Which adhesive should I choose?

For ordinary cardboard parcel packaging, a suitable permanent adhesive is usually the preferred option. Cold-storage, freezer or specialised packaging applications may require a different adhesive.

11. Shop 4×6 Shipping Labels at Blumax

Blumax supplies 100×150mm direct thermal shipping labels for Australian businesses, online sellers, warehouses and fulfilment operations.

Choose from different roll quantities, core sizes and fanfold configurations to suit your printing equipment.

With Australian stock, Melbourne-based dispatch and over 15 years of label industry experience, Blumax helps customers select reliable labels for everyday business needs.

Explore Blumax 100×150mm Shipping Labels

Select the right label size, roll quantity and core configuration for your printer and shipping requirements.