The 4 x 6 label is the standard shipping label for every major carrier, which is why almost every thermal printer made in the last twenty years handles it. It is also why there are so many versions of it.
Six specs separate one 4 x 6 label from another: print method, core size, roll size, perforation, wind direction and colour. Get all six right and the labels will effortlessly drop into your printer and work. Get one wrong and the labels will cause printing issues or won’t fit at all..
This guide covers each spec, shows you how to check what you need, and links to the matching stock.
Spec 1: direct thermal or thermal transfer
Decide this first, because it changes what else you need to buy.
Direct thermal labels have a heat sensitive coating. The printhead darkens the label itself. No ribbon, nothing else to stock. The print fades over months with heat and light, so these suit labels that leave the building.
Thermal transfer labels need a ribbon. The printhead melts ink from the ribbon onto the label, and the print lasts for years. These suit labels that stay on something.
For courier and shipping labels, direct thermal is almost always right. The label has one job for a few days. For product labels, pallet labels, asset tags or anything going into storage, use thermal transfer with a ribbon.
Not sure? Read direct thermal vs thermal transfer for the full comparison. The quickest check: if your printer has a ribbon loaded, it is printing thermal transfer.
Spec 2: core size
The core is the tube in the middle, measured on the inside. This is decided by what fits in your printer.
| Core | Typical printers |
|---|---|
| 0.75″ | Some compact desktop and courier printers |
| 1″ | Most desktop printers, such as Zebra ZD and GK series and most TSC and Honeywell desktop models |
| 3″ | Industrial printers, such as Zebra ZT series, SATO CL-NX, Datamax I-Class and Honeywell PM series |
To check, take the empty core off the spindle and measure the inside of the tube. Or look up your model in our printer database, which lists the published media specs for over 450 printer models.
Spec 3: roll size and labels per roll
Outer diameter (OD) sets how many labels fit on the roll. It also has to fit inside your printer.
Common 4 x 6 roll counts and roughly what they mean:
- 100 to 250 labels, around a 3.5 to 4 inch OD on a small core. Small desktop printers and low volume.
- 500 labels, around a 4.5 to 5 inch OD on a 1 inch core. Larger desktop printers.
- 1,000 labels, an 8 inch OD on a 3 inch core. Industrial printers.
Bigger rolls cost less per label and mean fewer roll changes, but only if the printer closes over them. Check the maximum OD in your manual first. Our guide to labels per roll, core and outer diameter shows some of the math behind these values.
Spec 4: perforated or not
A perforated roll has a line of small cuts between labels (called ‘perforations’) so you can tear one off by hand. A non perforated roll is continuous, and will not contain cuts.
Choose perforated if people tear labels off by hand, one at a time. Most shipping work falls into this category.
Choose non perforated if your printer has a cutter, you use a peel and present or print and apply system, or you print at high speed. Perforations are weak points, and at speed a roll can tear at the perf inside the printer. Non perforated also gives a cutter a clean line to cut.
Our 4 x 6 stock is perforated as standard. If you need non perforated, ask us before you order.
Spec 5: wound in or wound out
Wind direction is which way the label face points as the roll unwinds.
Wound out, also called face out, means the label surface is on the outside of the roll. This is the standard and fits most printers.
Wound in, or face in, means the label surface faces the core. Some printers and applicators need this because of the path the media takes to the printhead.
Load a roll with the wrong wind and the printer prints on the back of the liner. Nothing appears on the label, and the printer shows no error. If you changed suppliers and suddenly get blank labels from a printer that used to work, check the wind before anything else.
We stock a wound in 4 x 6 thermal transfer roll for printers that need it.
Spec 6: colour
White is standard. Coloured 4 x 6 labels let people sort work at a glance without scanning anything. One colour per carrier, per warehouse zone, per customer, or rush versus standard.
We stock 4 x 6 thermal transfer in six colours, each specified to a Pantone reference: red, orange, yellow, pink, green and blue.
Coloured stock is thermal transfer, so it needs a ribbon. Black print on a coloured label is the usual setup and scans well as long as the contrast is strong. Keep barcodes off the darker colours if your scanners struggle with them, and test a few before you commit to a full run.
Specialist versions worth knowing
Freezer grade
Standard adhesive stiffens and lets go in the cold. Freezer grade 4 x 6 uses an adhesive made to grab at low temperature and stay put. Ours is direct thermal, 1,000 labels per roll on a 3 inch core.
The detail that catches people out is application temperature versus service temperature. Many adhesives survive a freezer once they have bonded at room temperature, but will not bond at all to a surface that is already frozen. If you label inside the freezer, tell us when you order.
Fanfold
4 x 6 direct thermal fanfold comes stacked in a box instead of wound on a core, 5,000 labels to a case. There is no core or OD to match, and operators change media far less often. Many desktop printers take fanfold through a rear slot, so it is often the easiest route to high volume on a small printer.
Nearby sizes
4 x 6.5 comes up regularly, usually because a carrier or marketplace label format needs a little more depth. We stock it as a thermal transfer roll and as fanfold. If you switch sizes, change the label size in your printer driver too. Leave it on the old setting and the printer feeds an extra half inch after every label.
What we stock in 4 x 6
| Product | Type | Format | Best for |
|---|---|---|---|
| 4 x 6 white | Thermal transfer | 1,000 per roll, 3″ core, 4 rolls per case | Product, pallet and warehouse labels |
| 4 x 6 colours (six) | Thermal transfer | 1,000 per roll, 3″ core, 4 rolls per case | Colour-coded sorting |
| 4 x 6 wound in | Thermal transfer | 1,000 per roll, 3″ core, 4 rolls per case | Printers and applicators that need face in |
| 4 x 6 freezer grade | Direct thermal | 1,000 per roll, 3″ core, 4 rolls per case | Cold storage and frozen goods |
| 4 x 6 fanfold | Direct thermal | 5,000 per case | High volume shipping labels |
How to work out what you need in a few minutes
- Print method. Is there a ribbon in your printer? Ribbon means thermal transfer. No ribbon means direct thermal.
- Core. Measure the inside of the empty core.
- Maximum OD. Check the manual, or measure the media bay.
- Perforation. Does anyone tear labels by hand, or does a cutter or applicator handle them?
- Wind. Look at the roll that is loaded now. Is the printable face on the outside or the inside?
- Colour. White, unless you have a sorting reason.
Write those six down. They only change when your printer does, and they turn every future reorder into a two minute job.
The mistakes that cost the most
- Ordering by label size alone. “4 x 6” is one of six specs.
- Buying the biggest roll available. Cheaper per label, useless if the lid will not close.
- Perforated stock in a cutter. The cutter works, the perf tears in the wrong place, and you get half labels.
- Assuming wind direction is universal. It is not, and the failure typically appears like a printer fault instead of a media fault.
- Direct thermal for anything stored. The print fades. If the label has to be readable in many months, use thermal transfer.
Not sure which one you have?
Send us a photo of the roll in your printer, or just tell us the printer make and model. We will confirm the right spec before you order. Call 905-731-0552 or get in touch.
Ready to order? See every 4 x 6 label we stock.
Frequently asked questions
Are all 4 x 6 thermal labels the same?
No. Beyond the size, they differ by print method, core size, roll size, perforation, wind direction and colour. A roll that fits one printer may not fit another.
Do I need perforated 4 x 6 labels?
Only if people tear them off by hand. If you use a cutter or an applicator, or print at high speed, non perforated is better because perforations can tear inside the printer.
Can I use direct thermal 4 x 6 labels for product labels?
Not if the label has to stay readable for long. Direct thermal print fades with heat and light over months. Use thermal transfer with a ribbon for anything that stays on a product or goes into storage.
What core size does a Zebra printer take?
Zebra desktop models in the ZD and GK ranges take a 1 inch core as standard. Industrial models in the ZT range take a 3 inch core. Check your exact model in our printer database.
Why are my 4 x 6 labels printing blank?
On a thermal transfer printer, check that a ribbon is loaded and facing the right way. On direct thermal, check the roll is not loaded upside down. If both are fine, check the wind direction of the roll.
