Why your shipping label prints too small on a 4×6 thermal printer

Printing guide

You buy a label, send it to your 4×6 thermal printer, and out comes a tiny label in the middle of the sticker, or one with the barcode cut off. Almost always, the cause is the same: the label file is a full letter-size page (8.5×11 in), not a 4×6 label.

Why it happens

Many marketplaces and carriers produce labels for regular printers: the 4×6 label sits in one corner of a letter-size page, sometimes with a packing slip or instructions beside it, or rotated sideways. When you print that page on 4×6 stock, the print system either shrinks the whole page to fit (a tiny label) or prints only part of it (a cut-off label).

How to fix it

1. Ask for a 4×6 label in the first place

Several platforms let you choose the label format before downloading. Look for a setting such as label format, printer type or download preference, and pick 4×6 or thermal printer. It's often only on the desktop website, not in the mobile app.

2. Crop the page down to the label

If you already have a letter-size PDF, crop it to just the label, turn it upright if it's sideways, and print the cropped result. You can do this by hand in a PDF editor, but getting exactly 4×6 with the right margins is fiddly.

3. Print at 100%, on a 4×6 page

• Choose your label printer and a 4×6 in paper size.
• Set scaling to 100% or Actual Size, not “Fit” or “Shrink to fit”.
• Turn off headers, footers and margins if your browser or PDF viewer adds them.

4. Match the printer's resolution

Most 4×6 thermal printers print at 203 DPI, and some at 300 DPI. Sending a label prepared for a different resolution makes the system resize it, which blurs text and can make barcodes hard to scan.

Skip the manual steps. Label Magic finds the label, crops and rotates it, and prints an exact 4×6 at your printer's resolution. Your first 10 labels are free.