NIIMBOT B21 Pro B21-PRO-W Bluetooth Label Maker, 300 dpi, White

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Product guide

NIIMBOT B21 Pro B21-PRO-W Bluetooth Label Maker, 300 dpi, White

White: The NIIMBOT B21 Pro B21-PRO-W is a compact thermal label maker with Bluetooth printing and a listing claim of red-and-black output. It connects to iOS and Android through the NIIMBOT app, with USB cable printing from a PC also listed. The 300 dpi claim and dual-color printing are useful for detailed labels, but red-and-black and photo printing require special label paper.

At a glance

The listing describes red-and-black printing and grayscale photo printing, with special label paper required for color and photo printing.
The stated label-width range is 20mm-50mm(0.8-2 inch), with an effective printable width of 48mm and a longest supported label length of 200mm(7.87 inch).
The included roll is listed as 50x30mm labels (230pcs/Roll).
The NIIMBOT app offers automatic label identification and a range of fonts, borders and symbols, plus Excel, QR code and OCR printing features.
Bluetooth printing is listed for Android and iOS. USB cable connection to a PC is also listed, using the NIIMBOT computer application.

Price

$62.99Save 10%

Reference price: ~~$69.99~~

Price checked: Nov 12, 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

Case for NIIMBOT B21/Pro/B1, for SUPVAN T50M Pro Label Maker Accessories | Wireless Thermal Printer Holder, Labeling Tapes Roll Refills Storage, Home/Office Use, Mesh Pocket, Hard Case Only, Beige

$17.99

NIIMBOT Thermal Label Maker Paper 50×30 mm 230 Labels/Roll White 3Packs, for B1 B21 B31 B3S K3 Label Maker

$17.99

Pros and cons

Pros

Thermal printing avoids the need for ink cartridges, and the listing describes red-and-black output for labels made with the required special paper.
Compact dimensions and a listed weight of 11.36 ounces make it easier to place or carry than a larger desktop printer.
An included label roll gives buyers paper for an initial setup, according to the listing.

Cons

This is a label-only, simplex printer, not an all-purpose document printer.
The advertised red-and-black and photo printing depends on separately purchased special label paper.

Technical specifications

18 specifications

Identity
Brand	NIIMBOT
Model	B21-PRO-W
Color	White
Printing technology	Thermal
Print media	Labels

Printing
Resolution	300 x 300
Output type	Color
Ink color	red, black
Maximum monochrome print speed	50
Maximum media size	2 INCH
Paper size	1-2 INCH
Duplex	Simplex

Connectivity and controls
Wireless connection listed	Bluetooth
Hardware interface	USB
USB ports	1
Additional printer functions	Print Only

Dimensions and installation
Dimensions listed	5.12"D x 3.7"W x 2.4"H
Weight listed	11.36 ounces

What to know before buying

Listing details to confirm

The listing is inconsistent about resolution and media sizing: it claims 300 dpi in the title and features, gives a table value of 300 x 300, and lists both 2 INCH and 1-2 INCH for media or paper size. The stated label-width range is 20mm-50mm(0.8-2 inch). Confirm the intended label stock and supported size for your use before buying. Android Bluetooth firmware upgrade guidance is also provided for connection problems, so buyers who rely on Android should note that troubleshooting caveat.

Who is it for?

A good fit for

People organizing home, school or office items with narrow labels.
Small businesses or makers who want compact Bluetooth label printing and may use dual-color labels with compatible special stock.
Buyers who want app-based label design, with PC printing available by USB cable.

Less suited to

Anyone needing standard paper printing, duplex output or labels wider than the listed 2-inch maximum.
Buyers expecting red-and-black or photo printing on ordinary thermal labels without buying special paper.
Tablet users, which the listing says are not compatible and are not recommended.

NIIMBOT B21 Pro B21-PRO-W Bluetooth Label Maker, 300 dpi, White · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.6 / 5 · 118 ratings

5 stars81%81%
4 stars11%11%
3 stars5%5%
2 stars0%0%
1 star3%3%

Customer feedback describes the printer as easy to use and compact, while reports on print clarity differ: some find output sharp and others say letters look blurry. Feedback also mixes praise for its features and value with concerns about limited customization and price. That makes output quality and design flexibility worth considering, especially if your labels need fine detail or varied layouts. The listing's 300 dpi claim is a specification claim, not a guarantee of the results customers report.

Positive themes

Customers describe it as easy to use and appreciate its compact size and appearance.

Mixed feedback

Print quality is mixed, with reports ranging from sharp output to blurry lettering.
Customers differ on whether the feature set and customization options meet their needs.
Value opinions are mixed, with some considering it worth buying and others finding it expensive.

Frequently asked questions

Can the B21 Pro print red and black on any thermal label?

No. The listing says color printing requires special label paper, which is sold separately.

What label sizes does it support?

The feature text gives a width range of 20mm-50mm(0.8-2 inch), effective printable width of 48mm, and maximum label length of 200mm(7.87 inch). The technical details also list 1-2 INCH paper size, so check that your chosen stock is compatible.

How does it connect to phones and computers?

Bluetooth connection to Android and iOS through the NIIMBOT app is listed. PC connection is described as using a USB cable and the NIIMBOT computer application. The listing says it is not compatible with tablets.

Does everyday use require a paid app subscription?

The listing says daily use can rely on the app's existing free fonts and icons without a monthly fee. It also states that print history is saved only when logged into the app.