Guide · Labels

How to print Vinted and USPS shipping labels on a 4 × 6 thermal printer

Updated October 19, 2026 · Guidance, not carrier or printer support. Check every printed label before you ship.

You bought a thermal printer to stop taping letter-size paper to packages, and the first Vinted label you download is… a letter-size page with the label in one half. This guide explains why, how to crop that PDF to a clean 4 × 6 without uploading it anywhere, and which printer settings make the difference between a crisp barcode and a label that prints sideways or shrunken.

First: which Vinted labels do you actually print?

Not every Vinted US shipment needs a printer. According to Vinted’s help center, labels are prepaid and generated by Vinted, and the format depends on the route:

USPS, domestic, dropped at a post office: you get a digital label in the form of a QR code that is scanned at the counter. No printing.
USPS with a home pick-up, or international: you print the label and attach it to the package.
SpeedX: you “download and print the label at home and stick it on your package”, then drop it at a Vinted Go Shop, where the staff scan it.

So the printing question comes up for USPS pick-ups, international orders and SpeedX, plus any labels you buy yourself (for example through USPS Click-N-Ship or Pirate Ship) for other marketplaces. Whatever the route, keep proof of shipping, such as a copy of the label or the drop-off receipt, until the order is complete.

The letter-page problem

Carrier and marketplace label PDFs are generated for the most common printer in American homes: an inkjet or laser printer loaded with 8.5 × 11 paper. The 4 × 6 label is placed in the top or bottom half of the page, often with a receipt, packing slip or instructions in the other half; UPS- and FedEx-style labels tend to sit on the left half with instructions on the right. Print that page on a 4 × 6 roll and one of three things happens: the printer scales the whole page down until the label is a tiny, unscannable rectangle (“Fit to page”), it prints the label across two or more labels, or it prints sideways.

Rollo’s own support pages describe the same situation. A label that needs cropping typically sits on a larger page with a lot of blank space around it, so the 4 × 6 label is only a small part of what you see. The Rollo mobile app can detect and crop such labels automatically on Android and iOS, but on a desktop computer, Rollo says, you “will need to crop the label before sending it to Rollo”. Its troubleshooting article for sideways prints gives the same root cause: the file is “not properly formatted for 4 × 6 label printing”, and the fix for a letter-size label is to crop it to 4 × 6.

Cropping the label to 4 × 6, locally

Thriftkeep’s label cropper does this step in your browser; the PDF is never uploaded. The output is a standard PDF whose page is exactly 4 × 6 inches (288 × 432 points), one label per page, which is what every 4 × 6 thermal driver expects.

Open the label PDF. Thriftkeep looks at the page content and suggests the area that contains the label.
Pick the area if the guess is wrong. Presets cover the common layouts: top half (USPS, Vinted and Pirate Ship 2-up pages), bottom half (receipt on top), left or right half (UPS/FedEx style), the whole page if it is already a 4 × 6 label, and a portrait 4 × 6 printed at the top-left corner with ¼-inch margins.
Rotate. Rotation is automatic (a wide region is turned upright) or you choose 0, 90, 180 or 270 degrees.
Multi-page files. A PDF with several labels becomes one 4 × 6 label per page.
Download label-4x6.pdf and open it in your PDF viewer to print.

Cropping keeps the original vector content, so the barcode is not re-rasterized or blurred; it is the same barcode at the same resolution, just on a smaller page. Before you print a batch, print one and check that the full barcode, both addresses and all carrier markings are present. A label that is cut off at the edge is a label the carrier may refuse.

The print settings that matter

Three settings decide whether the 4 × 6 PDF comes out right. Shipping software vendors give the same advice for Rollo, Zebra, DYMO and similar printers:

Paper size: exactly 4 × 6 inches (or 100 × 150 mm, which is the same size). Choose it in the print dialog before you press Print.
Scale: 100% / Actual Size, not “Fit to Page” or “Shrink to fit”. With a 4 × 6 PDF on 4 × 6 paper there is nothing to fit; any scaling only shrinks the barcode.
Orientation: Portrait.

Rollo

Rollo printers are direct thermal: no ink, toner or ribbon, and “4 × 6 inches is the standard shipping label size”. Both fan-fold stacks and rolls work; Rollo suggests placing a roll two to three inches behind the printer so it can pull labels smoothly. If a correctly cropped label still prints sideways, Rollo’s fix is to set the rotation to 0 in the printer settings: on a Mac, pick your label size under Presets in the print dialog, then Printer Features → Page Options → Rotate “0”; on Windows, open Devices and Printers, right-click Rollo, open Settings and set Orientation / Rotate to “0”. Print Rollo’s sample label first: if the sample is right and your label is wrong, the problem is the file, not the printer.

MUNBYN, Zebra and other 4 × 6 thermal printers

The same three settings apply, but the menus differ by model and driver, and we have not tested specific MUNBYN or Zebra models. Install the manufacturer’s driver for your model, create or select a 4 × 6 inch (100 × 150 mm) paper size in that driver, and print the cropped PDF at actual size in portrait. If your model has a label-calibration or “auto-detect label size” routine, run it after loading a new roll; it is the usual fix for labels that start printing halfway down. For model-specific steps, use the manufacturer’s setup guide rather than a generic one.

Before you stick it on the package

The barcode is complete, dark and sharp. Thermal prints that look grey or faded usually mean the density setting is too low or the label stock is old or damaged; use good-quality direct thermal labels.
Both addresses, the postage or carrier marks, and any QR code are fully inside the label.
Nothing is mirrored or rotated so that text runs off the label.
You have kept a copy of the original PDF or a photo of the printed label as proof of shipping.

Troubleshooting

Symptom	Likely cause	What to do
Label prints tiny in the corner	“Fit to page” or wrong paper size	Set paper to 4 × 6 and scale to 100% / Actual Size.
Label spans two labels or starts halfway	Page is still letter-size, or the printer has not calibrated the gap between labels	Crop to 4 × 6 first; run the printer’s label calibration.
Prints sideways	Wide crop region, or rotation set in the driver	Rotate 90° in the cropper, or set the driver rotation to 0.
Receipt prints instead of the label	Wrong half selected	Switch the preset from top half to bottom half (or left/right).
Barcode will not scan	Scaled output, low darkness or poor stock	Reprint at 100% with higher darkness on fresh labels; never photocopy a label.

How Thriftkeep helps

The 4 × 6 label cropper in Thriftkeep is free with no account, and it runs entirely in your browser. The same extension keeps a local ledger of your purchases, sales, shipping and fees per platform, so the cost of mailers and labels you buy yourself ends up in your profit figures. See also Vinted seller fees in the US explained.

Get the free label cropper ↗

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All retrieved October 19, 2026.

Vinted, USPS, UPS, FedEx, SpeedX, Pirate Ship, Rollo, MUNBYN, Zebra and DYMO are trademarks of their respective owners. This guide is independent and not affiliated with any of them.