Zebra GK420 Series

The pictures shown are general images for product GK420 Series and may not be applicable to all part numbers

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Lifetime Support
15 Day Return Period
GK420 Series Features
5 ips
Color Options

Dark Grey, Health Care White

GK420 Series Barcode Printers

The Zebra GK420 Series has reached end of life. It has been replaced by the Zebra ZD421.

The Zebra GK420 series of barcode printers offer solid label printing in a small form factor, ideal for locations such as health care and low volume shipping/inventory management. Available as a direct thermal or thermal transfer printer, GK420 prints 4" wide labels at a snappy 5" per second. All units ship with USB standard and with your choice of RS-232 Serial or Ethernet interfaces, making the Zebra GK420 a versatile and easy to use solution for small to medium-scale labeling operations.

  • ZPL and EPL compatible
  • 203 dpi print resolution
  • 8 MB SDRAM ; 4 MB Flash
  • Tool-less printhead and platen replacement
    Label and Ribbon Guidelines
  • Label Outer Diameter (OD) must be 5" or Less
  • Roll Fed or Fan Fed
  • Die-cut or continuous direct thermal labels with or without black line
  • Tag stock, continuous receipt paper & wristbands
  • Ribbon Standard Length 244'/74m
  • Ribbon Max Width 4.3"/109.2mm
  • Core .5"/12.7mm
Please see accessories below for a small label and ribbon selection and visit POSGuys Label Page for a larger selection.
Product Specifications
Color Options Dark Grey
Health Care White
Interface USB V1.1, Serial RS-232, ZebraNet 10/100 Ethernet (optional)
Maximum OD 5"
Maximum Print Area Width: 4.09 in (104 mm)
Length: 39 in (991 mm)
Paper Dimensions Width: 0.75 to 4.25 in (19 to 108 mm)
Paper Thickness 0.003 to 0.0075 in (0.08 to 0.19 mm)
Print Method GK420d: Direct thermal
GK420t: Thermal transfer
Print Speed 5 in / second (127 mm / second)
Print Resolution 203 dpi / 8 dots per mm
Character Set Native open type font support, Unicode™ compliant for multi-language, on-demand thermal printing
Resident Fonts ZPL: 16 residen expandable ZPLII bitmap fonts, one resident scalable ZPL font
EPL: Five resident expandable EPL2 fonts
Barcodes Supported Barcode Ratios: 2:1 (non-rotated) and 3:1

Linear Barcodes: Codabar, Code 11 (ZPL), Code 128, Code 39, Code 93, Code 93, EAN-13, EAN- 8, EAN-14 (ZPL), German Post Code (EPL), Industrial 2-of-5 (ZPL), Interleaved 2-of-5, Japanese Postnet (EPL), ISBT-128 (ZPL), Logmars (ZPL), MSI, Plessey, Postnet, GS1 DataBar (RSS-14), Standard 2-of-5 (ZPL), UCC/EAN-128 (EPL), UPC and EAN 2 or 5 digit extensions (ZPL), UPC-A, UPC-A and UPC-E with EAN 2 or 5 digit extensions, UPC-E, and GS1 Databar (RSS)
Barcodes Continued 2-Dimensional: Codablock (ZPL), Code 49 (ZPL), Data Matrix, MaxiCode, QR Code, PDF417, MicroPDF417, Aztec - Barcode information for EPL and ZPL except where noted.
Graphics Printing Supports user-defined fonts and graphics including custom logos, ZPL II drawing commands—for boxes and lines
Memory 8 MB SDRAM, 4 MB Flash
Printer Languages EPL and ZPL co-resident
Two Color Printing Capabilities No
Auto Cutter No
Peeler / Presenter Optional
Internal Rewind No
LCD Display No
Weight GK420d: 3 lb (1.4 kg)
GK420t: 4.6 lb (2.1 kg)
Dimensions GK420d: 6.75W x 6H x 8.25D in (171 x 152 x 210 mm)
GK420t: 7.6W x 7.5H x 10D in (193 x 191 x 254 mm)
Wall Mountable No
Operating Temperature 41°F - 105°F (5°C - 41°C)
In The Box GK420d: Documentation and software, cleaning pen, printer, USB cable, power cord (may not be included depending on region), power supply
GK420t: Documentation and software, cleaning pen, ribbon core, printer, USB cable, power cord (may not be included depending on region), power supply
Ribbon Length (max) 244'
Ribbon Width (max) 4.3"

Zebra GK420 Series Reviews

POSGuys Rating:

Aug '17: 5/5 Stars The GK420 is the midline of label printers from Zebra. It is faster than the older 2824 and GC410 series, in a very compact and well built casing. The GK420 is available in a large variety of interfaces with USB/Ethernet being the most popular. The best thing going for the GK420 is compatibility, nearly all label printing and point of sale labeling modules were built to work with the Zebra desktop barcode printers. Compatible media is also the easiest to find out of all the desktop printers, from very small jewelry labels to large shipping labels the GK420 can print them all. Calibration is also very easy to do with a single control button the only thing you need to use. Thermal Transfer (ribbon) models are available for applications requiring a more permanent label.

Customer Reviews

Frequestly Asked Questions

Product Video Transcript

GK420 Printer Video

Hi, Travis from POSGuys.com. Today we're going to go over how to calibrate your Zebra G-Series Desktop printers. So this applies to the GX420, GK420, GC420. There's several models that are in their desktop line that this applies to. Basically the ones that don't have an LCD screen and are the dark grey color. The lighter color white ones, the older ones, LP2824, LP2844, they have a slightly different process.

So by default this is the one button on here that you use to calibrate, if it shoots out multiple labels, it skips labels, or it's aligned in the middle of the label, you'll need to run a calibration. To do that, you'll hold down this button. It's going to flash once, then it's going to flash a double flash, and then it's going to flash a triple flash and then a quadruple flash. What you're looking for is the double flash. So you hold this down, you get a single flash, then it's going to be a double flash. That's when you let go. After you let go, the printer is going to spit off one label, maybe two labels, and it's going to be calibrated after that. Whenever you hit the button you should get one label spit out of it.

Right here I have black mark labels being used. If you're going to switch to a different label, like a shipping label with a gap instead of a black bar, you drop in your label and you hit the button. So that might happen, where it's not cleanly feeding out labels, you just go through the process one more time, hold down the button,it flashes once, then you'll get a double flash. After the double flash, you release and it's ready to go. You've switched from black mark labels to gap sensitive labels. So this applies to the calibration to the GX420, GC420 or GK420. For more information on those printers, or to purchase, please visit us at POSGuys.com. Thanks!


(Single Roll) 4"W x 2"H Z-Select 4000D Labels: White with Perforation Between Labels, 1240 Labels/Roll
4" Ribbon Take-Up Core For 4" Thermal Transfer Printers. 0.5" OD. (Three Pack)
Zebra Desktop Wax-Resin Thermal Transfer Ribbon, Black, 110mm wide x 74m length, .5 inch Core, Single Roll
ZDesigner Pro v2 Software, Barcode Label Software, for Proxis, Cash Register Express and Aldelo
2 Year Zebra Warranty, SValue, Must Be Purchased With In 30 Days of Desktop Printer, 5 Day TAT, Non-Comprehensive - For GC, GK, LP/TPL, ZD4 Series Printers
GK Power Supply Kit (US/EUR Cords)
ZEBRA SPARES Take-Up 4" RIBBON CORE (Case of 50)
Zebra Ribbon Roll - Wax/Resin: 110mm x 74m / 4.33" x 243'

Previously Available Models