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Convert an 8.5×11 shipping label to 4×6

A letter-size shipping label is a 4 × 6-ish label sitting on a big sheet of paper. To print it on a thermal roll you either ask the platform for the 4 × 6 version or crop the label out of the page. Shrinking the whole sheet to fit is the one thing to avoid.

Quick answer

Don't shrink the whole letter page onto the label: that leaves the label at under half its real width. Re-download the label in the platform's 4 × 6 format if offered, or crop the label area onto a 4 × 6 page, then print with paper size 4 × 6 at 100% (Actual size).

By the Label Ninja team · Published 2026-10-01 · Last updated

01 / The trapWhy "fit to page" is the wrong fix

A 4 × 6 label is 101.6 × 152.4 mm. A letter page is 215.9 × 279.4 mm. If you print the full letter page onto a 4 × 6 label with Fit to page, everything on it, including the label, shrinks to roughly half its width. The barcode bars get thinner, and a carrier scanner may have trouble reading them.

Cropping keeps the label at its original size and only removes the empty paper and instructions around it.

Fit to page shrinks the label; a 4 × 6 PDF at 100% does notTwo 4 by 6 labels at the same scale. Left: a whole letter page squeezed onto the label, so the shipping label covers less than half the width. Right: a 4 by 6 PDF printed at 100 percent fills the label.Letter PDF + Fit to pagelabel shrinks to about 47%of its real width4 × 6 PDF at 100%label prints full size
Fit to page against a real 4 × 6 PDF, drawn to scale: 8.5 in squeezed to 4 in is about 47% of the original width.

02 / Pick oneThree ways to get a 4 × 6 label

1. Re-download in 4 × 6 (best when offered)

Most shipping platforms let you choose a label-printer or 4 × 6 format in their label or print settings, and many let you reprint a label you already paid for in the new format. See our guides for eBay and Whatnot. The platform's own 4 × 6 file is usually laid out for thermal printing, so it needs no cropping.

2. Crop the PDF you already have

When there is no 4 × 6 option, as with many return labels and some carrier sites, crop the label area onto a 4 × 6 page. Our shipping label to 4×6 tool does this in your browser, so the PDF stays on your device. It works on the file you give it; it does not buy, change or create postage.

3. Print on paper and cut

No thermal printer? Print the original page at 100% on plain paper, cut out the label and tape it flat to the package. Some sellers use half-sheet adhesive labels (8.5 × 5.5 in) in an ordinary printer for the same purpose.

03 / Option 2 in detailCrop a letter-size label step by step

  1. Save the label as a PDF. If it opened in your browser, use Download or Print → Save as PDF.
  2. Open the shipping label to 4×6 tool and load the PDF.
  3. Make sure the crop covers the full carrier label, from the sender block to the bottom of the tracking barcode, with a small white margin. Adjust it if the tool lets you.
  4. Check the preview. If the label is sideways on the original page, it needs to end up upright on the 4 × 6 page.
  5. Download the 4 × 6 PDF and print it with the settings below.

If the label is a little smaller than 4 × 6 once cropped, that is fine. Print it at its real size with white space around it rather than stretching it.

A letter-size page cropped to a 4 × 6 labelLeft: an 8.5 by 11 inch page with the shipping label in a dashed box and instructions below it. Right: the same label on its own 4 by 6 inch page, drawn at the same scale, so nothing is shrunk.cropsame size8.5 × 11 in page4 × 6 in pageprint at 100%
Cropping moves the label onto its own 4 × 6 page at the same size. Label position varies by carrier; this shows the idea, not one carrier's layout.

04 / Print itThermal printer settings for a 4 × 6 PDF

  • Paper size: 4 × 6 in (101.6 × 152.4 mm) in the printer driver or print dialog.
  • Scale: 100% or Actual size. Turn off Fit, Shrink oversized pages and multiple pages per sheet.
  • Orientation: portrait, or auto.
  • Viewer: if the browser's PDF viewer ignores the paper size, try a desktop PDF reader.

Still small or cut off? The printing-too-small guide walks through driver settings on Rollo, Zebra and Munbyn printers. It applies to any shipping label, not only Whatnot.

Generic print settings for a 4 × 6 thermal labelA simplified print dialog, not any real program: printer set to your thermal label printer, paper size 4 by 6 inches, scale 100 percent or actual size selected instead of fit to page, one page per sheet and no margins.Print settingsgeneric drawingPrinterYour thermal label printerPaper size4 × 6 in (101.6 × 152.4 mm)match the stock you loadedScale100% / Actual sizeFit to pagePages per sheet1MarginsNone
The settings that matter for a 4 × 6 PDF. A generic drawing, not a screenshot of any real driver; names differ by printer and operating system.

05 / Before you shipQuick label checklist

  • Whole barcode and tracking number present, with no bars cut off.
  • Delivery address readable and not stretched.
  • One label per package, stuck flat, not over a box seam.

What we verified and what we did not: the page dimensions and print settings here are standard. Platform menu names change, and we have not tested every carrier's label layout. Label Ninja is an independent tool and does not sell postage.