Which mobile printers fit the 4" x 6" mobile labels?

Verified: Zebra ZQ630 and ZQ630 Plus, Zebra QLn420, and Zebra QL420 and QL420 Plus. Brother RJ-4250WB and RJ-4230B are likely compatible; we recommend a sample roll first.

Will these work in a Zebra ZQ520, ZQ521 or Honeywell RP4?

Not this size. The roll is about 2.3" (58 mm) across, larger than those printers' 2.25" roll limit. Our 3" x 2" mobile labels (ECOTHERM13110-25) fit them.

Do these fit a Zebra ZQ110, QLn220, Honeywell RP2 or MP Compact 4?

No. The ZQ110, QLn220 and RP2 are too small or too narrow for a 4" label, and the MP Compact 4 Mark III needs a 40 mm core. These rolls use a 0.75" core.

What sensing do these labels use?

Black mark: a black mark printed on the back of the liner. Set your printer to black mark sensing, not gap.

What's the difference between mobile 4" x 6" and desktop 4" x 6" labels?

Mobile 4" x 6" labels use a 0.75" inner core to fit handheld and belt-clip mobile printers, which have smaller media compartments than desktop printers. The label facestock, adhesive, and print quality are identical to the desktop version — only the core size, roll outer diameter and sensing differ (mobile rolls use a black mark on the liner). Don't load 1" core rolls into a mobile printer; the spindle won't fit.

Are these compatible with USPS, FedEx, UPS, and Amazon shipping platforms?

Yes. 4" x 6" is the standard shipping label format for all major US carriers and platforms — USPS, FedEx, UPS, Amazon, eBay, Etsy, Shopify, ShipStation, Pirate Ship, and others. The labels print barcodes, QR codes, and tracking data from any of these systems with proper printer configuration.

No. These are direct thermal labels — the printer's thermal head creates the image directly on the heat-sensitive label. Ribbons are only needed for thermal transfer printers, which mobile printers typically don't support.

Ecotherm 4" x 6" direct thermal mobile printer labels — single roll on 0.75" core, 75gsm matte white, perforated.

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Ecotherm 4" x 6" Direct Thermal Mobile Printer Labels — 0.75" Core Rolls

Name: Ecotherm 4" x 6" Direct Thermal Mobile Printer Labels — 0.75" Core Rolls
SKU: ECOTHERM13108-25
Price: 158.99 USD
Availability: OutOfStock

EcothermSKU: ECOTHERM13108-25

Pack Size: 25 Rolls (105 Labels Per Roll - 2625 Labels)

Price:

$158.99

Stock:

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Width: 4"
Length: 6"

Label Size: 4" x 6"
Inner Core Of Roll: 0.75" Core Rolls
Print Method: Direct Thermal
Color: White
Material: Paper
Perforations: Perforated
Adhesive: Permanent Hot Melt
Labels Across: 1
Sold By: Sold By The Case

Ecotherm 4" x 6" direct thermal mobile printer labels are designed for portable and mobile direct thermal printers that use 0.75" core rolls. The 4" x 6" format is the standard size for many shipping, logistics, warehouse, route delivery, and package identification workflows where a full-size label is needed from a mobile printer.

These labels are made with 75gsm direct thermal paper with a heat-sensitive protective coating, a permanent hot melt adhesive, and a 60gsm white glassine liner. They print without a ribbon and are built for compatible mobile direct thermal printers that support 4" wide media, 6" label length, 0.75" core rolls, black mark sensing, and the required roll outside diameter.

Mobile printer compatibility

Ecotherm 4" x 6" mobile labels use a 0.75" core with black mark sensing, and each roll measures about 2.3" (58 mm) across. Your printer needs at least 3" of print width and room for a roll up to 2.36" (60 mm).

Verified fit: Zebra ZQ630 and ZQ630 Plus, Zebra QLn420, Zebra QL420 and QL420 Plus.

Likely compatible, sample roll first: Brother RJ-4250WB / RJ-4250WB-L and RJ-4230B / RJ-4230BL.

Not a fit for this size: Zebra ZQ520, ZQ521 and Honeywell RP4 / RP4e / RP4f (roll is larger than their 2.25" limit; our 3" x 2" mobile labels fit them). Zebra ZQ510, ZQ511, ZQ610, ZQ620, QLn220, QLn320, Honeywell RP2 series and Brother RJ-2150 / RJ-3150 are too narrow for a 4" label. Zebra ZQ110 is too small, and the Honeywell MP Compact 4 Mark III needs a 40 mm core.

Set your printer to black mark sensing, not gap. Not sure about your model? See our printer compatibility guide or ask us.

Why Choose 4" x 6" Mobile Direct Thermal Labels?

Standard 4" x 6" size for shipping labels, package labels, and logistics workflows
Designed for mobile printer applications where a 0.75" core roll is required
Useful for route delivery, field service, warehouse receiving, and outbound shipping
Works well for carrier labels, carton labels, pallet staging labels, and package identification
Provides room for barcodes, addresses, tracking numbers, item details, and routing information
Good fit for inventory control, warehouse operations, distribution, and fulfillment workflows
Direct thermal format prints without a ribbon for fast, simple mobile labeling
A strong option when desktop 1" core shipping labels will not fit the printer’s mobile roll format

Key Features

Label size: 4" x 6"
Mobile printer roll format with 0.75" core
Direct thermal print method — no ribbon required
75gsm bright white direct thermal face stock with heat-sensitive protective coating
Permanent hot melt adhesive for dependable general-purpose bonding
60gsm white glassine liner for smooth printer feeding
Perforated between labels for easy separation
Service temperature range: 5°F to 149°F (-15°C to 65°C)
Minimum application temperature: 50°F (10°C)
Shelf life: 1 year when stored at 73°F and 50% relative humidity
Designed for resistance to water, oil, plasticizer exposure, and scratching under normal handling conditions

Common Applications

Ecotherm 4" x 6" direct thermal mobile printer labels are commonly used for shipping labels, package labels, route delivery labels, logistics labels, warehouse receiving labels, outbound shipping labels, carrier labels, carton labels, inventory labels, field service labels, distribution labels, fulfillment labels, barcode labels, tracking labels, and general-purpose mobile direct thermal labeling.

Why Buy from Ecotherm?

Free shipping from Amazon's US fulfillment centers. Prime members can check out with Buy with Prime; the delivery date shown below the button is Amazon's live estimate for your address.
Free shipping to the contiguous United States
US-based support Monday-Friday, 8:30am-5:00pm CST
Need help confirming printer compatibility? Contact us or email sales@ecothermlabels.com

BPA-free and BPS-free: the white direct thermal facestock is independently tested by SGS (June 2026) with both BPA and BPS not detected — a confident choice where material safety matters.

Which mobile printers fit the 4" x 6" mobile labels?: Verified: Zebra ZQ630 and ZQ630 Plus, Zebra QLn420, and Zebra QL420 and QL420 Plus. Brother RJ-4250WB and RJ-4230B are likely compatible; we recommend a sample roll first.
Will these work in a Zebra ZQ520, ZQ521 or Honeywell RP4?: Not this size. The roll is about 2.3" (58 mm) across, larger than those printers' 2.25" roll limit. Our 3" x 2" mobile labels (ECOTHERM13110-25) fit them.
Do these fit a Zebra ZQ110, QLn220, Honeywell RP2 or MP Compact 4?: No. The ZQ110, QLn220 and RP2 are too small or too narrow for a 4" label, and the MP Compact 4 Mark III needs a 40 mm core. These rolls use a 0.75" core.
What sensing do these labels use?: Black mark: a black mark printed on the back of the liner. Set your printer to black mark sensing, not gap.
What's the difference between mobile 4" x 6" and desktop 4" x 6" labels?: Mobile 4" x 6" labels use a 0.75" inner core to fit handheld and belt-clip mobile printers, which have smaller media compartments than desktop printers. The label facestock, adhesive, and print quality are identical to the desktop version — only the core size, roll outer diameter and sensing differ (mobile rolls use a black mark on the liner). Don't load 1" core rolls into a mobile printer; the spindle won't fit.
Are these compatible with USPS, FedEx, UPS, and Amazon shipping platforms?: Yes. 4" x 6" is the standard shipping label format for all major US carriers and platforms — USPS, FedEx, UPS, Amazon, eBay, Etsy, Shopify, ShipStation, Pirate Ship, and others. The labels print barcodes, QR codes, and tracking data from any of these systems with proper printer configuration.
Do I need a ribbon?: No. These are direct thermal labels — the printer's thermal head creates the image directly on the heat-sensitive label. Ribbons are only needed for thermal transfer printers, which mobile printers typically don't support.

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Ecotherm 4" x 6" Direct Thermal Mobile Printer Labels — 0.75" Core Rolls

Specifications

Description

Mobile printer compatibility

Why Choose 4" x 6" Mobile Direct Thermal Labels?

Key Features

Common Applications

Why Buy from Ecotherm?

Frequently Asked Questions

Payment & Security

Ecotherm 4" x 6" Direct Thermal Mobile Printer Labels — 0.75" Core Rolls

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