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Print MyPost Business Labels on a Thermal Printer

Step-by-step guide to printing MyPost Business shipping labels on Dymo, Zebra, and Brother thermal printers. Fix the A4-to-4x6 problem fast.

·8 minutes reading
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You just bought a thermal printer. Labels are loaded, drivers installed, and you're ready to ship orders faster.

Then you hit print on your first MyPost Business label and it comes out as a tiny label crammed into the corner of an A4-sized page. Or the barcode is cut off. Or the whole thing is blank.

Every Australian eCommerce seller runs into this when switching from an inkjet to a thermal printer. It's fixable, and once you've set it up properly, you won't think about it again.

In this article:

Why MyPost Business labels don't work on thermal printers out of the box

MyPost Business was built for A4 paper. That made sense when every small business had a laser printer on the desk. Thermal printers use 4x6 labels (100x150mm), but MyPost Business defaults to generating A4-sized PDFs.

Hit "Print" without changing settings and you get an A4 PDF with a small label sitting in one corner. Your thermal printer doesn't know what to do with that. It shrinks the whole A4 page to fit a 4x6 label (unreadable), prints only the top-left corner (barcode cut off), or spits out a blank.

The problem: MyPost Business outputs A4. Your thermal printer expects 4x6. Something has to convert between the two.

Two ways to fix it:

  1. Change MyPost Business settings so it outputs A6 labels natively
  2. Convert the A4 PDF to 4x6 after downloading

Option 1 works for domestic labels. Option 2 is needed for international labels, which only come in A4 format.

Thermal printer setup for printing MyPost Business shipping labels

Step 1: Change your MyPost Business label size to A6

This is the most important setting. Most sellers miss it because it's buried in account settings rather than the print dialog.

  1. Log in to your MyPost Business account
  2. Click the Carriers tab in the top navigation
  3. Find MyPost Business and click the edit icon (blue pencil)
  4. Go to Print Settings
  5. Change the label size to A6 - 1 label (Plain Paper)
  6. Save your changes

Every domestic label you generate from now on will be sized for your thermal printer.

One catch: this only applies to domestic labels. International shipping labels from MyPost Business are locked to A4 with no A6 option. For those, you'll need to crop the PDF or use a conversion tool (covered below).

If you're using a platform like SellerDash or ReadyToShip that connects to MyPost Business, the label size setting might be in the platform's carrier configuration instead. Check your platform's help docs if it's not where you expect.

Step 2: Configure your thermal printer

With MyPost Business generating A6 labels, your printer needs to match. Three settings matter:

  • Paper size: 100x150mm (or 4x6 inches)
  • Print quality: 203 DPI minimum (barcodes need to be scannable)
  • Orientation: portrait

Windows setup

  1. Open Settings > Printers & Scanners
  2. Click your thermal printer, then Manage > Printing Preferences
  3. Set paper size to 100 x 150 mm (or 4 x 6 in)
  4. Set orientation to Portrait
  5. Click Apply

Mac setup

  1. Open System Settings > Printers & Scanners
  2. Select your thermal printer
  3. Open a test PDF, go to File > Print
  4. Click Paper Size and select 100 x 150 mm
  5. If 100x150mm isn't listed, click Manage Custom Sizes and create it (width: 100mm, height: 150mm, margins: 0)

Print a sample label from MyPost Business before doing a full batch. Go to Settings > Labels > Generate a sample label in your account. Saves wasting a real label on a test.

Configuring MyPost Business label settings for thermal printers

Step 3: Get the print settings right

Even with the right label size and printer config, the print dialog can still ruin things.

PDF viewer settings (Adobe Acrobat, Preview, Chrome)

  • Paper size: 100 x 150 mm (4 x 6 in)
  • Scaling: "Fit" or "Actual size". Never "Shrink to fit"
  • Orientation: Portrait
  • Margins: None (or minimum)

The scaling trap

This trips up more people than anything else. If your PDF viewer is set to "Shrink to fit" or has a custom scale factor, your label prints too small. The barcode becomes unscannable and the post office rejects it.

Set scaling to "Fit" or 100% (Actual size). If the label looks slightly cropped in the preview, that's usually fine. The barcode, address, and tracking number will still be within the printable area.

Printing multiple labels at once

MyPost Business puts batch labels into a single PDF. When printing:

  1. Open the PDF in your viewer
  2. Select Print All Pages
  3. Confirm paper size is 4x6 and scaling is correct
  4. Each label prints on its own 4x6 label

If labels are doubling up (two per label) or you're getting blank pages between them, paper size is probably still set to A4 in the print dialog.

Printer-specific setup guides

Different thermal printers have different quirks. Here's what to know for the most popular models in Australia.

Dymo LabelWriter 4XL / 5XL

The most common thermal printer among Australian eBay and Etsy sellers.

  1. Install Dymo LabelWriter Software (includes drivers)
  2. Load 4x6 (100x150mm) shipping labels, Dymo-branded or compatible
  3. In your print dialog, select the Dymo printer
  4. Set paper size to Shipping / Name Badge (4" x 6")
  5. Print orientation: Portrait

One thing to watch: Dymo's software sometimes overrides your paper size setting. If labels are printing wrong, try printing directly from Chrome or Adobe Reader instead of through Dymo's software.

The 4XL has been discontinued, so if you're buying new, get the 5XL. Faster and uses the same 4x6 label stock.

Zebra ZD421 / ZD220 / GK420d

Zebra is the professional option. Faster, more durable, built for high-volume shipping. Takes a bit more setup:

  1. Install Zebra Browser Print or ZDesigner drivers
  2. Run the media calibration wizard (the printer needs to detect your label size)
  3. Set media type to Direct Thermal
  4. Set label size to 100 x 150 mm
  5. Print speed: 3-4 inches/second works well
  6. Darkness: 15-20 (adjust if barcodes are too light or dark)

Zebra printers need to re-calibrate when you load a new roll. If you're getting blank labels or the printer feeds through multiple labels at once, run the calibration again.

Brother QL-1100 / QL-1110NWB

Brother has an official Australia Post setup guide worth bookmarking.

  1. Install P-touch Editor and printer drivers
  2. Load DK-11241 shipping labels (102x152mm) or compatible 4x6 stock
  3. In P-touch Editor, set the label size to match your stock
  4. When printing from a PDF, select the Brother printer and set paper to 102 x 152 mm

Brother's DK label rolls are slightly different (102x152mm vs the standard 100x150mm). The 2mm difference rarely causes problems, but if labels look off-centre, adjust margins in MyPost Business under Settings > Labels > Label Position.

MUNBYN thermal printers

The budget option that's popular on Amazon AU.

  1. Install the MUNBYN driver from their website
  2. Load 4x6 (100x150mm) labels
  3. Set paper size to 100 x 150 mm in printer preferences
  4. Calibrate by holding the feed button for 3-5 seconds until the printer auto-detects the label gap

Some MUNBYN models default to 100x180mm paper size. Change it to 100x150mm manually or you'll get a large gap at the bottom of every label.

Australian ecommerce seller preparing shipping labels for dispatch

Troubleshooting common issues

Labels print too small

Your print dialog is still outputting A4, and the printer scales it down to fit the 4x6 label.

Go back to Step 1 and check that MyPost Business is set to A6. Then check your print dialog. Paper size should be 4x6, not A4.

Barcode won't scan at the post office

Usually a print quality issue. MyPost Business barcodes run vertically, which is harder for thermal printers to render crisply.

Increase your printer's darkness/heat setting by 2-3 notches. On Zebra, try 20-22. On Dymo, print at "Best" quality. If it's still unscannable, check whether your labels are low-quality or expired. Thermal labels degrade over time, especially in heat.

Blank labels feeding through

The printer can't detect where one label ends and the next begins.

Re-calibrate. On Zebra, hold the feed button while turning on the printer. On MUNBYN, hold feed for 5 seconds. On Dymo, calibration is automatic but sometimes needs a power cycle.

Labels print off-centre

Either the margin settings are wrong or the label guide inside the printer isn't flush against the label roll.

Physically check the label roll first. The guide should be touching the edge of the labels with no play. Then adjust margins in MyPost Business under Settings > Labels > Label Position.

International labels still print on A4

MyPost Business only supports A4 for international labels. No A6 option.

You need to crop the A4 PDF down to 4x6 before printing. Open the PDF, select just the label area, save as a new 4x6 PDF. It's tedious, which is why tools like LabelChop exist.

The faster way: automatic label conversion

If you're shipping more than a few parcels a day, the print dialog routine gets old. Especially for international labels where you're stuck with A4 PDFs.

LabelChop watches your Downloads folder, detects MyPost Business label PDFs as they come in, crops them from A4 to 4x6, and sends them to your thermal printer automatically.

No print dialogs. No manual cropping. No fiddling with scaling settings.

Set it up once (pick your watch folder, select your printer) and every label after that prints itself. Works with Dymo, Zebra, Brother, MUNBYN, and any other 4x6 thermal printer. Handles both domestic and international labels.

There's a 14-day free trial if you want to try it before committing.

The main thing is getting MyPost Business and your printer on the same page. Set label size to A6, configure your printer for 4x6, and check your scaling settings. Do it once and you're sorted.

Questions about your specific printer? Check our FAQ for more details.