Zebra GX420 Label Printer Guide: GX420d vs GX420t Specs

The Zebra GX420 label printer is a 4 inch, 203 dpi desktop printer that comes in two versions: the GX420d, which prints direct thermal only, and the GX420t, which adds a ribbon for thermal transfer printing. It became one of the most common shipping label and warehouse label printers of its era, and many sites still run fleets of them today.

We list 18 GX420 part numbers, all refurbished: 10 GX420d builds and 8 GX420t builds, with Ethernet, parallel or Wi-Fi alongside USB and serial. This guide explains GX420d vs GX420t, how to read the part numbers, media and ribbon, driver setup and command languages, the lifecycle dates Zebra publishes and the replacement it names, and how the GX420 compares with the GX430t and ZD621. For the recorded values, jump to the GX420 specs table or the full GX420 range.

Products in our listing

Four popular GX420 builds are shown below; the full range table lists all 18 part numbers.

ZebraGX42-202411-000Zebra GX420d 4-Inch 203dpi Direct Thermal USB / Serial / Ethernet Desktop Label PrinterIn stockView Details →

ZebraGX42-102411-000Zebra GX420t 4-Inch 203dpi Thermal Transfer USB / Serial / Ethernet Desktop Label PrinterIn stockView Details →

ZebraGX42-202710-000Zebra GX420d 4-Inch 203dpi Direct Thermal USB / Serial / Wi-Fi Desktop Label PrinterIn stockView Details →

ZebraGX42-102510-000Zebra GX420t 4-Inch 203dpi Thermal Transfer USB / Serial / Parallel Desktop Label PrinterIn stockView Details →

Every GX420 we list is refurbished and carries the 30-Day Tech Seller USA warranty. Browse the full Zebra printer range or all printers and scanners.

Zebra GX420 label printer specs in our listing

Values below come from our product data for each model. They are the same across every part number of that model except the interface, which is listed per part number in the range table.

What the GX420 is for

The GX420 is a workhorse for 4 inch labels at 203 dpi. That resolution is the standard for shipping labels, carton labels, pick and pack labels, address labels and most linear barcodes, and it lets the printer run at up to 6 inches per second, so a 4 x 6 label comes out in about a second. Common homes are ecommerce packing benches, small warehouses, returns desks and shipping stations.

The direct thermal GX420d suits short life labels: shipping labels, receipts style tickets and anything that will be scanned within weeks. The GX420t suits sites that also need durable output, such as product labels, asset tags, shelf labels and labels that face sunlight, heat or handling for months. Our shipping label compliance guide covers what carriers expect from a label, and the Zebra G-Series GC vs GK vs GX guide shows where the GX420 sits next to the GC and GK models.

The GX420 is a good fit for single-unit buyers replacing one failed printer at a station, and for multi-unit buyers who run ten or fifty identical stations and want every new unit to match the rest. Keeping the same model keeps drivers, label formats and media unchanged. For very high daily volumes or 8 inch labels, an industrial printer is the better tool; our industrial vs desktop label printers guide explains where that line falls.

GX420d vs GX420t: which one you need

Zebra GX420d. The d stands for direct thermal. There is no ribbon: the printhead darkens heat sensitive label stock directly. It is the usual choice for shipping labels. Direct thermal labels fade over time and with heat or sunlight, so they are not meant for long life labeling. In our data the GX420d is the lighter unit at 3 lbs.

Zebra GX420t. The t stands for thermal transfer. Our product data records every GX420t as thermal transfer and direct thermal, so it prints with a ribbon on paper, coated paper or synthetic labels, and without a ribbon on direct thermal stock. Thermal transfer labels last much longer and resist abrasion and chemicals when you pick the right ribbon. The GX420t is recorded at 4.6 lbs because of the ribbon mechanism.

Everything else in our data is the same: 203 dpi, up to 6 in/sec, 4.09 inch print width, 0.75 to 4.25 inch media, 4MB Flash and 8MB SDRAM, and ZPL II and EPL2. If your labels only need to survive the trip to the customer, the GX420d is enough. If you also print labels that must stay readable for months or years, choose the GX420t. Our direct thermal vs thermal transfer guide explains the trade off in more detail.

Interface builds and part numbers

GX420 part numbers start with GX42. In our listing, part numbers that start GX42-2 are GX420d direct thermal builds and part numbers that start GX42-1 are GX420t builds, and the rest of the number reflects the factory configuration. The safest rule for a replacement is to read the full part number from the label on the printer you are replacing and match it.

Ethernet builds (USB, serial and Ethernet) suit shared network printing from a warehouse system, shipping platform or ERP. We list 9 of them across both models. Parallel builds (USB, serial and parallel) suit a single workstation or older equipment that still uses a parallel or serial port; we list 6. Wi-Fi builds (USB, serial and Wi-Fi) suit stations where running a network cable is impractical: GX42-202710-000 for the GX420d and GX42-102710-000 for the GX420t. Our printer connectivity guide covers each option.

One GX420d part number, GX42-212910-0540, has no connectivity value in our product data, so check its interface with us before ordering if your station depends on a specific port.

Media and ribbon for the GX420

Our data records a media width of 0.75 to 4.25 inches and a maximum print width of 4.09 inches (104 mm) for both models. That covers small 1 inch labels up to standard 4 x 6 shipping labels.

For the GX420d, buy direct thermal labels; standard paper labels will not print. For the GX420t, match the ribbon width to the label, or slightly wider, and match the ribbon type to the material: wax for paper labels, wax and resin for coated paper and many synthetics, and resin for polyester and polypropylene labels that need to resist chemicals, heat or abrasion. Ribbons must be made for Zebra desktop printers so the core and winding direction fit. Our label media and ribbon selection guide goes into detail.

GX420 driver, setup and command languages

Our data records ZPL II and EPL2 for every GX420. ZPL II is the language most shipping platforms, warehouse systems and label design programs send to Zebra printers. EPL2 is the older Zebra desktop language, and support for it means a site still sending EPL from older software can swap in a GX420 without rewriting label formats. Our ZPL vs ESC/POS command languages guide explains the differences.

For the GX420 driver, Zebra support lists Zebra Setup Utilities for Windows as the tool to install the driver and configure the printer. A practical setup sequence: load media (and ribbon on a GX420t), run media calibration, print a configuration label, set the IP address on Ethernet or Wi-Fi builds, install the driver, then print your real labels from your own application. Template sizes should be set for 203 dpi.

The recorded memory is 4MB Flash and 8MB SDRAM. That is plenty when software sends a complete label each time, but it is limited if you store many formats, fonts or graphics on the printer, so check what your current units hold before standardizing.

GX420 discontinued: lifecycle and replacement

Zebra lists the GX420 as discontinued on both of its support pages. As checked on November 4, 2026, the GX420d and GX420t pages state that Zebra is no longer offering the product for sale, with a printer discontinuation date of January 31, 2022 and a service and support discontinuation date of April 30, 2025 for North America, EMEA and Latin America (December 31, 2021 and February 28, 2025 for APAC). Zebra names the ZD621 as the replacement for both.

What this means for buyers: Zebra no longer sells new GX420 printers or offers customer support for them, so refurbished units are the practical way to keep an existing fleet consistent. For a new deployment or a site planning several years ahead, the ZD621 is the model Zebra points to. Our Zebra ZD Series desktop printers guide and ZD620 vs ZD621 part number guide explain the newer range, the guide to legacy Zebra desktop printers covers the models the GX420 itself replaced, and our end of life hardware spares strategy explains how to keep spares on hand for a discontinued fleet.

Checking a refurbished GX420

A refurbished Zebra GX420 label printer should be checked on arrival before it goes into service.

Printhead. Print a test pattern or configuration label on arrival and look for thin white lines running the length of the label; a single failed dot will cut through barcodes. Our printhead failure diagnosis and replacement guide explains what to look for.

Platen roller and sensors. A worn or glazed platen causes skew and light print that is often mistaken for a head fault, and dirty media sensors cause skipped labels. Our thermal printer maintenance guide covers cleaning.

Interface and accessories. Confirm the build matches your part number, that the port you need works, and that the power supply and cord are present. On a GX420t, check that the ribbon spindles turn freely.

Condition terms. Our refurbished hardware grading guide explains what refurbished means at Tech Seller USA.

GX420 vs GX430t and ZD621 in our listing

The Zebra GX430t (GX43-100410-000) is the 300 dpi sibling in the same chassis. Choose it when small text, small 2D codes or fine barcodes need sharper print; choose the GX420 when speed on standard shipping and carton labels matters more.

The Zebra ZD621d (ZD6A042-D21F00EZ) and Zebra ZD621t (ZD6A042-301F00EZ) are 203 dpi, 4 inch models in the range Zebra names as the GX420 replacement. Our data records both at up to 8 in/sec (203 mm/s) with 512MB Flash and 256MB SDRAM, ZPL II and EPL2, USB, Ethernet and serial, and a 0.585 to 4.65 inch media width. The ZD621d is recorded at 3.6 lbs and the ZD621t at 5.5 lbs. They are faster than a GX420 and hold far more stored formats, so they suit new stations or sites that want a model Zebra still supports, while the GX420 suits sites matching an existing fleet. Our Zebra ZD421 desktop label printer guide covers another current alternative.

Full GX420 range in our listing

Every GX420 part number we list is below. All are 203 dpi, up to 6 in/sec and refurbished. Select a part number to open its product page.

Common questions