Thermal label paper size does not match the PDF?

Prepare the file for the paper you actually use, and get reminders for the printer settings the web tool cannot change.

Two different problems can look the same

The PDF file may have the wrong page size or too much blank space.

The printer driver may be using a different paper size from the actual roll.

The browser print dialog may apply scaling or margins.

What the web tool can solve

Resize and crop the PDF file to match your chosen paper size.

Respect visible PDF rotation and crop boxes.

Explain when the remaining issue is probably printer setup.

Troubleshoot the mismatch

1Choose the real label paper size first.

2Upload the label file and describe what happens when printing.

3Check the fixed preview.

4If preview is correct but physical print is shifted, inspect printer paper, scale, and margins.

What requires printer settings

Reading the paper loaded in the printer requires a client app or printer integration.

Driver calibration, sensor issues, and physical feed problems cannot be fixed by editing the PDF.

Thermal paper mismatch FAQ

Can the browser detect my printer paper size?

No. A website can prepare the PDF and open the print dialog, but it cannot reliably read or change printer driver settings.

Should I choose 4x6 or 100 x 150 mm?

Choose the size that matches your actual label paper or printer driver preset. They are close, but not identical.

Use Label Printing AI to generate a PDF that matches your selected paper size.