Royal Mail 6x4 label settings checker
Check whether your Royal Mail or Click & Drop PDF is ready for 6x4 thermal printing, or whether the page size, print scale or driver preset will make the label tiny, clipped or sideways.
Quick answer
- Check the PDF page size before changing printer hardware.
- Use a 6x4, 4x6, 100x150mm or exact custom paper preset for thermal stock.
- Print a native label-sized PDF at Actual Size or 100%, not Fit to page.
- Crop or convert A4, Letter and sheet-style PDFs before thermal printing.
Interactive settings checker
Find the label-size mismatch before you print paid postage
Nothing is uploaded or stored. Choose what you see in the PDF properties and print dialog, then use the result panel as a practical Royal Mail 6x4 pre-print checklist.
Result
Fix these settings before printing a batch
One part of the print chain is still uncertain. Fix it before using paid postage.
- 1. Open PDF properties or print preview and confirm the page size before printing.
- 2. Check the saved printer-driver paper size in Windows or macOS before printing.
- 3. Find the scale dropdown and confirm it is not silently set to Fit to page.
PDF: Open PDF properties or print preview first. Guessing at page size is how labels end up tiny or clipped.
Printer preset: Find the saved driver paper size before printing paid postage.
Royal Mail label sizes for 6x4 thermal printing
For most Royal Mail and Click & Drop thermal-printer workflows, the practical target is a 6x4 inch label. You may also see the same workflow described as 4x6, 100x150mm, 102x152mm or close to A6.
The names are close enough to confuse sellers, but the printer only cares about the actual page size, driver preset and label stock. If those three do not agree, the output can shrink, drift or clip the barcode.
- 6x4 inch and 4x6 inch are the same physical stock with different wording.
- 100x150mm and 102x152mm are common metric thermal-label sizes.
- A6 is close, but it is not identical to 6x4 or 100x150mm.
- A4 is an office-paper page, not a thermal-label roll size.
For a longer explanation, read the Royal Mail label size guide for 6x4 printing. If you need the whole printer setup path, use the Royal Mail label printer setup checker.
A4 and sheet-style PDFs are the tiny-label trap
A Royal Mail label can be valid while the PDF page around it is wrong for thermal printing. If the label sits inside a full A4 or Letter page, a 6x4 printer sees the whole page and scales that page down onto one label.
That is why the actual address label becomes tiny. Fit to page makes the problem worse because it treats the office-paper canvas as the thing that must fit.
If your PDF is A4, Letter or a multi-label sheet, crop or convert the label area before thermal printing. For one-off files, use the free A4 to 4x6 shipping label converter. If you are not sure what you have, run the file through the shipping label size checker or the carrier format label tool before printing.
6x4 print settings to use after the PDF is correct
Once the PDF page is label-sized, keep the print chain boring. Set the thermal printer driver to the stock you loaded, use Actual Size or 100% scale, turn off browser headers and print one label before a batch.
- Paper size: 6x4, 4x6, 100x150mm, 102x152mm or exact custom size.
- Scale: Actual Size, no scaling or 100%.
- Orientation: whichever fills the preview without clipping.
- Calibration: run after loading a new roll or changing stock size.
- Quality: print from the original PDF, not a screenshot or pasted image.
If the test label prints too small, use the shipping label printing too small diagnostic. If an edge or barcode disappears, use the cut-off shipping label diagnostic before changing every printer setting.
When LabelChop helps with Royal Mail PDFs
LabelChop is for sellers who already have shipping-label PDFs and want the repeated crop-and-print step removed. It watches a folder, detects compatible shipping-label PDFs, crops or resizes awkward A4, Letter, A6, 4x6 and 100x150mm pages, then prints or saves thermal-printer output.
LabelChop is not an official Royal Mail or Click & Drop integration. It helps after your Royal Mail, marketplace or shipping-tool workflow has produced the label file.
FAQ
What size should Royal Mail labels be for a thermal printer?
Many Royal Mail thermal workflows use 6x4 inch labels, also described as 4x6, 100x150mm or 102x152mm. Match the PDF, driver and stock.
Is A6 the same as 6x4 for Royal Mail labels?
No. A6 is close, but it is not identical to 6x4 or 100x150mm. It may work, but check for clipped edges and barcode drift.
Why is my Royal Mail label printing too small?
The common causes are an A4 PDF, Fit to page, Shrink to printable area, a wrong paper preset or printing from a browser that changed scale.
Can I use this checker for Click & Drop labels?
Yes. It is built for Royal Mail and Click & Drop PDF workflows where you need to confirm page size, printer preset and print scale.
Is LabelChop an official Royal Mail integration?
No. LabelChop helps with compatible shipping-label PDFs after you have the file. It is not an official Royal Mail or Click & Drop integration.
Doing this more than once a week?
LabelChop watches your Downloads folder and automates the crop-and-print step for awkward Royal Mail, carrier and marketplace shipping-label PDFs.
Try LabelChop automation