What connectivity options does the Keychron J4 offer?

The Keychron J4 provides three versatile ways to connect: ultra-fast 2.4 GHz wireless, Bluetooth for pairing with multiple devices, and a classic wired connection. This flexibility makes it easy to switch between your computer, tablet, or even your smartphone.

Can I customize the key functions and macros on the J4?

Absolutely! The J4 is designed for personalization through the Keychron Launcher web app. You can remap any key, assign macros, and tailor the keyboard layout to fit your workflow, whether you’re gaming, programming, or multitasking.

Is the Keychron J4 hot-swappable?

Yes, the hot-swappable version of the Keychron J4 allows you to easily change out the mechanical switches without any soldering. This means you can experiment with different switch types to find your perfect typing feel or replace switches if needed.

What layout does the J4 use?

The J4 features an 80% Tenkeyless (TKL) layout, which includes all the essential keys for productivity while saving desk space. This makes it compact and portable, yet still highly functional for daily use.

How do I switch between wireless and wired modes?

Switching modes is straightforward: simply use the dedicated toggle on the keyboard to choose between Bluetooth, 2.4 GHz wireless, or wired USB-C connection. This lets you adapt quickly to different devices and scenarios.

Does the J4 work with both Windows and macOS?

Yes, the J4 is designed for seamless compatibility with both Windows and macOS systems. Keycaps for both operating systems are included, and you can easily switch between layouts with a simple key combination.

What makes the Keychron Super mechanical switches special?

Keychron Super mechanical switches are engineered for a satisfying typing experience, offering smooth keystrokes and reliable performance. They’re also designed to be easily swapped out on the hot-swappable version of the J4, so you can customize your keyboard feel.

Can I use the J4 with multiple devices at once?

Yes, with Bluetooth connectivity, you can pair the J4 with up to three devices and switch between them effortlessly using keyboard shortcuts. This feature is perfect for users who work across laptops, tablets, and phones.

Is there onboard memory for custom key settings?

The J4 retains your personalized key remaps and macros directly on the keyboard. This means your customizations will stay intact, even if you switch devices or operating systems.

How do I update the firmware or software for the J4?

Firmware updates and key remapping are managed through the Keychron Launcher web app. Simply connect your J4 and follow the instructions to ensure your keyboard stays up to date with the latest features and improvements.

Keychron J4 Starting at $58.99

Name: Keychron J4
Brand: Keychron
SKU: keychron-j4-qmk-wireless-mechanical-keyboard-us-ansi-layout

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Keychron J4 HE Wireless Hall Effect Magn...
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Keychron J4 QMK Wireless Mechanical Keyboard
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Keychron J4 HE Wireless Hall Effect Magn...

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Keychron J4 QMK Wireless Mechanical Keyboard

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Compare Keychron J4 vs Ajazz AK871 vs Epomaker G84 Specification

Compare similar keyboards side by side, or use the comparison table to compare all keyboards!

Model	Keychron J4	Ajazz AK871	Epomaker G84
	77		-10% off 83
Rating	0.0 stars (0 reviews)	0.0 stars (0 reviews)	4.8 stars (26 reviews)
Purchase Options
Main differences	Has Linear, Tactile, Clicky switch options Provides dedicated media keys Offers Yes, Rgb, North-face, Rgb North-face RGB lighting	Released in 2023 Has Clicky, Linear switch options Supports Bluetooth, 2.4 GHz, Wireless connectivity Weighs about 970 g Sized at 41 x 153 x 362 mm Made with a ABS case Features ABS keycaps Offers No RGB lighting	Has Linear switch options Features N-key rollover Uses a Gasket Mount mounting style Sized at 19 x 146 x 344 mm Made with a Plastic case Offers Yes, Rgb, South-face, Rgb South-face RGB lighting
Score	Scores Performance: 70.4 Build Quality: 71.4 Productivity: 74.2 Customizability: 86.9 Portability: 66.4	Scores Performance: 38.9 Build Quality: 39.1 Productivity: 50.8 Customizability: 48.6 Portability: 67	Scores Performance: 81.8 Build Quality: 77.2 Productivity: 80.3 Customizability: 86.7 Portability: 69.6
Name	Name Keychron J4	Name Ajazz AK871	Name Epomaker G84
Release year	Release year 2025	Release year 2023	Release year 2025
Switch Options	Switch Options Linear, Tactile, Clicky	Switch Options Clicky, Linear	Switch Options Linear
Profile	Profile Normal Profile	Profile Normal Profile	Profile Normal Profile
Hot Swappable	Hot Swappable	Hot Swappable	Hot Swappable
Layout Size	Layout Size 80%	Layout Size 80%	Layout Size 80%
Layout Standard	Layout Standard ANSI	Layout Standard ANSI	Layout Standard ANSI
Layout Ergonomics	Layout Ergonomics Normal	Layout Ergonomics Normal	Layout Ergonomics Normal
Knob Support	Knob Support	Knob Support	Knob Support
Display Support	Display Support	Display Support	Display Support
Mac/Win Support	Mac/Win Support	Mac/Win Support	Mac/Win Support
Multi-Media Keys	Multi-Media Keys	Multi-Media Keys	Multi-Media Keys
USB-C	USB-C	USB-C	USB-C
USB passthrough	USB passthrough	USB passthrough	USB passthrough
Connection	Connection Bluetooth, 2.4 GHz, Wired, Wireless	Connection Bluetooth, 2.4 GHz, Wireless	Connection Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate	Polling Rate 1000 Hz	Polling Rate -	Polling Rate 1000 Hz
Battery capacity	Battery capacity 4000 mAh	Battery capacity -	Battery capacity 4000 mAh
Hall Effect Support	Hall Effect Support	Hall Effect Support	Hall Effect Support
QMK Support	QMK Support	QMK Support	QMK Support
VIA Support	VIA Support	VIA Support	VIA Support
VIAL Support	VIAL Support	VIAL Support	VIAL Support
N-Key Rollover	N-Key Rollover	N-Key Rollover	N-Key Rollover
Rapid Trigger	Rapid Trigger	Rapid Trigger	Rapid Trigger
Mount Style	Mount Style -	Mount Style -	Mount Style Gasket Mount
Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers	Screw in Stabilizers
Sound Dampening	Sound Dampening	Sound Dampening	Sound Dampening
Backlight	Backlight Rgb, North-face	Backlight	Backlight Rgb, South-face
Case Colors	Case Colors	Case Colors	Case Colors
Case Material	Case Material -	Case Material ABS	Case Material Plastic
Keycaps Material	Keycaps Material PBT	Keycaps Material ABS	Keycaps Material PBT
Dimensions	Dimensions -	Dimensions 41 x 153 x 362 mm	Dimensions 19 x 146 x 344 mm
Weight	Weight -	Weight 970g	Weight -

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Product Description

The Keychron J4 US is a wireless mechanical keyboard with an 80% tenkeyless layout, suited for users who want a compact board with flexible connectivity and easy customization. It fits well for those who value the ability to switch between wired and wireless modes and want to program keys or macros through a web app. It also appeals to hobbyists interested in modifying switches without soldering, though only the hot-swappable version supports this feature.

Key Features

Supports 2.4 GHz wireless, Bluetooth, and wired USB connection, allowing seamless switching between devices or connection types.
80% tenkeyless layout saves desk space while retaining most keys needed for productivity and gaming.
Keychron Launcher web app enables users to customize key functions and macros, enhancing workflow or gaming setups.
Hot-swappable switch option allows easy replacement of switches without soldering, giving flexibility to change typing feel or repair switches.

Connectivity

The keyboard offers three connection modes: wired USB for stable, low-latency use; Bluetooth for convenience with multiple devices; and 2.4 GHz wireless for a balance of responsiveness and cable-free use. This versatility suits users who switch between desktop and mobile setups or prefer wireless freedom without sacrificing reliability.

Trade-offs

Hot-swappable functionality is limited to specific versions, so users must confirm the model if this feature is important.
Unknown battery life and latency details may affect wireless use expectations.
The 80% layout omits the number pad, which may be less ideal for users needing frequent numeric input.

Frequently Asked Questions (FAQ)