Carrier format label tool for A4, Letter, 4x6 and 100x150mm PDFs
Upload a shipping-label PDF from a carrier, marketplace or shipping tool and see what page format it actually uses before you waste a thermal label on the wrong print settings.
Best for PDF labels from carrier, marketplace or shipping tools. If your file is a screenshot or image, check the PDF page size in your viewer instead.
Identify the PDF page format
See the page dimensions in millimetres and inches, then match them to common carrier label formats.
Check A4, Letter, A6 and 4x6
Useful when a file came from a carrier portal, marketplace export or older download and you are not sure what it is.
Avoid wrong printer settings
Know whether to print at 100 percent, change the paper preset, rotate the file or crop the label first.
Find the next fix
Use a one-off converter for a single awkward PDF or automate the crop-and-print workflow when it keeps happening.
What this carrier format label tool checks
The tool reads the PDF page size and reports the dimensions in millimetres and inches. That is often enough to explain why a label prints tiny, sideways, cut off or spread across more than one thermal label.
It is meant for shipping-label PDFs from carrier portals, marketplaces and shipping tools. It does not verify postage, carrier acceptance or address data. It simply answers the print workflow question: what format is this PDF, and what should you check before sending it to a 4x6 or 100x150mm printer?
Common carrier label formats you might see
- 4x6 inches or 100x150mm: usually ready for a thermal printer when the driver paper size matches.
- 6x4 inches: the same physical size rotated. Check portrait versus landscape before printing.
- A6: close to the common thermal label size, but still worth checking paper presets and scale.
- A4 or Letter: often needs cropping, conversion or a carrier setting change before thermal printing.
- Custom dimensions: review the preview, paper preset and barcode size before using expensive label stock.
What to do after you identify the label format
If the result is already 4x6 or 100x150mm, print from the original PDF at 100 percent scale and make sure your operating system printer preset also says 4x6 or 100x150mm. If the print still looks wrong, check the shipping label printing too small guide and the cut-off label checklist.
If the result is A4 or Letter, use the A4 to 4x6 shipping label converter for a one-off file. If those PDFs keep arriving from USPS, Royal Mail, MyPost Business, eBay, Shopify, Etsy or another workflow, LabelChop can watch your Downloads folder, crop or resize compatible shipping-label PDFs and send the clean output to your thermal printer.
If you only need the general dimensions without uploading a PDF, use the shipping label size converter to compare inches, millimetres and pixels at common printer DPI values.
FAQ
What does a carrier format label tool check?
It checks the PDF page dimensions and tells you whether the file looks like A4, Letter, A6, 4x6, 6x4, 100x150mm or a custom label size.
Does this work with carrier PDFs from Royal Mail, USPS, AusPost, eBay or Shopify?
Yes, it can inspect PDF page sizes from carrier and marketplace workflows. LabelChop helps with compatible PDFs and workflows, not official carrier integrations.
Does this tool save uploaded shipping labels?
No. The check reads the PDF page dimensions for the diagnosis and does not store uploaded shipping-label PDFs.
What should I do if the carrier PDF is A4 or Letter?
For one label, convert or crop it before printing. For recurring awkward carrier PDFs, use a watch-folder workflow such as LabelChop.