Advanced 4-Inch Desktop Label Printing Made Simple
The Zebra ZD421 Direct Thermal Printer is an easy-to-use, reliable desktop printer designed for busy retail stores, logistics hubs, healthcare environments, and office stockrooms. As the direct successor to the popular Zebra GK420d series, the ZD421 offers faster printing, updated security, and flexible setup options.
Using direct thermal technology, the ZD421 prints clear address tags, shipping labels, price stickers, and wristbands without needing ink or ribbon changes.
Simple Buying Guide: Choosing the Right Setup
To help you pick the perfect unit for your workspace, this listing combines all core configurations of the ZD421 Direct Thermal series:
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Standard USB & Modular Slot (ZD4A042-D0EM00EZ - 203dpi / ZD4A043-D0EM00EZ - 300dpi): Connects directly to a single computer via USB cable. Features an empty modular slot on the back so you can add Ethernet or wireless cards later if your needs change.
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Wired Ethernet Network (ZD4A042-D0EE00EZ - 203dpi / ZD4A043-D0EE00EZ - 300dpi): Plugs straight into your office or warehouse network router, allowing multiple computers and users to print to the same machine.
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Wireless Wi-Fi 6 & Bluetooth 5.3 (ZD4A042-D0EX02EZ - 203dpi): Features advanced Wi-Fi 6 (802.11ax) and Bluetooth 5.3 for cable-free printing from mobile handhelds, laptops, and tablets anywhere on your network.
Key Features
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No Ink Required: Direct thermal printing uses heat-sensitive paper, saving money on expensive ink cartridges and carbon ribbons.
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Choice of Print Resolutions: Available in standard 203 dpi for fast shipping labels, or sharp 300 dpi for tiny text, detailed logos, and small barcodes.
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Flexible Connection Options: Choose between simple USB, wired Ethernet (LAN) networking, or fast Wi-Fi 6 (802.11ax) with Bluetooth 5.3.
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Modular Upgrade Slot: Models with the modular slot allow you to add new connectivity options in the future without buying a new printer.
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Easy Status Lights: Features clear LED icons for status, paper, ribbon, and pause so staff can fix issues instantly.
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Simple Media Loading: Open clamshell design lets workers drop in new 4-inch label rolls in seconds.
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Includes UK & EU Power Cables: Ships with both official UK 3-pin and European 2-pin power leads in the box.
What is in the Box?
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1 x Zebra ZD421 Direct Thermal Desktop Printer
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1 x Official UK 3-Pin Mains Power Lead
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1 x Official EU 2-Pin Mains Power Lead
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1 x Power Supply Unit (PSU)
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1 x USB Cable
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1 x Empty Label Take-Up Core
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1 x Quick Setup & Safety Guide
On the Zebra ZD421 Direct Thermal Printer, the modular connection slot is an upgrade bay located on the back panel of the machine.
Zebra designed this slot so you can install field-upgradeable connectivity options yourself, using optional plug-and-play modules without needing to open the main printer casing or send the unit away to a technician.
