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Compare Keychron K3 vs K4 Max Differences Side by Side

This comparison is for buyers deciding between Keychron's compact and full-size wireless offerings. The choice is difficult because both are hot-swappable, support multiple operating systems, and offer wireless connectivity. The K3 prioritizes a slim, lightweight form factor with low-profile switches, while the K4 Max focuses on a comprehensive feature set, extensive programmability, and a larger battery in a denser 96% layout.

65
Keychron K3 Ultra-slim Wireless Mechanical Keyboard FR-ISO Layout
87
Keychron K4 Max QMK Wireless Mechanical Keyboard ISO Layout Collection

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0.0 (0)
5.0 (1)
  • Released in 2023
  • Has Tactile, Linear, Clicky switch options
  • Features a low-profile design
  • Available in a 75% layout
  • Built with the ISO-FR, ISO, ANSI layout standard
  • Connects via USB-C
  • Uses a Plate Mount mounting style
  • Supports Bluetooth, Wired, Wireless connectivity
  • Equipped with a 1550 mAh battery
  • Made with a Aluminum, ABS case
  • Features PBT, ABS keycaps
  • Offers Yes, Rgb, White, North-face, Rgb North-face RGB lighting
  • Released in 2025
  • Has Linear, Tactile, Clicky switch options
  • Available in a 96% layout
  • Built with the ISO, ANSI layout standard
  • Supports QMK firmware
  • Supports VIA configuration
  • Features N-key rollover
  • Includes screw-in stabilizers
  • Has built-in sound dampening
  • Uses a PCB Mount mounting style
  • Supports Bluetooth, 2.4 GHz, Wired, Wireless connectivity
  • Runs at a 1000 Hz polling rate
  • Equipped with a 4000 mAh battery
  • Weighs about 1290 g
  • Sized at 31 x 391 x 140 mm
  • Made with a ABS case
  • Features PBT keycaps
  • Offers Yes, Rgb, South-face, Rgb South-face, White, White South-face RGB lighting
Scores
  • Performance: 62.7
  • Build Quality: 61.7
  • Productivity: 66.8
  • Customizability: 69.6
  • Portability: 78.2
Scores
  • Performance: 82
  • Build Quality: 80.3
  • Productivity: 89.4
  • Customizability: 93
  • Portability: 50.8
Name
Keychron K3
Name
Keychron K4 Max
Release year
2023
Release year
2025
Switch Options
Tactile, Linear, Clicky
Switch Options
Linear, Tactile, Clicky
Profile
Low Profile
Profile
Normal Profile
Hot Swappable
 
Hot Swappable
 
Layout Size
75%
Layout Size
96%
Layout Standard
ISO-FR, ISO, ANSI
Layout Standard
ISO, ANSI
Layout Ergonomics
Normal
Layout Ergonomics
Normal
Knob Support
 
Knob Support
 
Display Support
 
Display Support
 
Mac/Win Support
 
Mac/Win Support
 
Multi-Media Keys
 
Multi-Media Keys
 
USB-C
 
USB-C
 
USB passthrough
 
USB passthrough
 
Connection
Bluetooth, Wired, Wireless
Connection
Bluetooth, 2.4 GHz, Wired, Wireless
Polling Rate
-
Polling Rate
1000 Hz
Battery capacity
1550 mAh
Battery capacity
4000 mAh
Hall Effect Support
 
Hall Effect Support
 
QMK Support
 
QMK Support
 
VIA Support
 
VIA Support
 
VIAL Support
 
VIAL Support
 
N-Key Rollover
 
N-Key Rollover
 
Rapid Trigger
 
Rapid Trigger
 
Mount Style
Plate Mount
Mount Style
PCB Mount
Screw in Stabilizers
 
Screw in Stabilizers
 
Sound Dampening
 
Sound Dampening
 
Backlight
 
Rgb, White, North-face
Backlight
 
Rgb, South-face, White, White South-face
Case Colors
Case Colors
Case Material
Aluminum, ABS
Case Material
ABS
Keycaps Material
PBT, ABS
Keycaps Material
PBT
Dimensions
-
Dimensions
31 x 391 x 140 mm
Weight
-
Weight
1290g
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Pros and Trade-offs

Your primary need dictates the choice. If portability, a sleek desk profile, and a low-profile typing feel are paramount, the Keychron K3 is the obvious pick. For virtually every other scenario—especially gaming, programming, office work, or serious customization—the Keychron K4 Max's superior feature set, programmability, and included number pad make it the more versatile and capable keyboard.

Keychron K3

  • +Ultra-slim, low-profile design for a compact and lightweight feel.
  • +Low-profile optical switches offer a unique, shallow typing experience.
  • +Includes 17 extra keycaps for macOS/Windows compatibility.
  • +Two-level adjustable rubber feet for typing angle customization.
  • +Bluetooth 5.1 connectivity for wireless use with multiple devices.
  • −Limited to low-profile Keychron Optical switches, not standard MX-style.
  • −Smaller 1550mAh battery offers less wireless runtime.
  • −Lacks a number pad due to its 75% layout.
  • −No mention of advanced programmability like QMK or VIA.

Keychron K4 Max

  • +Feature-rich 96% layout includes a number pad in a compact form.
  • +Full QMK and VIA support for unlimited key remapping and macros.
  • +Massive 4000mAh battery for extended wireless use.
  • +Includes multiple sound-dampening foams (IXPE, PET, EPDM) and a steel plate.
  • +Triple connectivity: 2.4 GHz (1000 Hz), Bluetooth 5.1, and wired.
  • −Heavier and larger at 1290g and 391mm wide, less portable.
  • −Higher price point compared to the K3.
  • −Standard profile height may not suit users seeking an ultra-low typing position.

Which Keyboard Is Better for Your Needs?

The K4 Max is the clear choice for users who need maximum features, programmability, and a number pad, winning in Gaming, Office, Programming, Modding, and Content Creation. Its advantages include high polling rate, QMK support, extensive sound dampening, and a large battery. The K3 wins only for Travel, where its ultra-slim, low-profile, and compact 75% design are decisive factors for portability.

GamingKeychron K4 Max
  • •The K4 Max lists a 1000 Hz polling rate for its 2.4 GHz connection, which the K3's specifications do not mention.
  • •It features N-key rollover, a spec not listed for the K3.
  • •The manufacturer states its 1000 Hz polling rate makes latency 'hardly noticeable even in competitive games'.
OfficeKeychron K4 Max
  • •The K4 Max's 96% layout includes a number pad, which the 75% K3 lacks.
  • •It has a massive 4000mAh battery compared to the K3's 1550mAh.
  • •It includes sound-dampening foams (IXPE, PET, EPDM) for a quieter office environment.
ProgrammingKeychron K4 Max
  • •The K4 Max offers full QMK and VIA support for deep key remapping and macros.
  • •Its 96% layout provides dedicated arrow and navigation keys without the full footprint of a 100% board.
  • •South-facing RGB LEDs allow compatibility with Cherry-profile keycaps without interference.
TravelKeychron K3
  • •The K3 is an ultra-slim, low-profile keyboard described as 'one of the thinnest and lightweight'.
  • •Its 75% layout is significantly more compact than the K4 Max's 96% layout.
  • •It weighs less, as the K4 Max is listed at 1290g, while the K3's weight is not specified, suggesting a lighter build.
ModdingKeychron K4 Max
  • •The K4 Max supports QMK/VIA firmware and uses a PCB mount with screw-in stabilizers.
  • •It is compatible with a wide range of 3-pin and 5-pin MX-style switches.
  • •It features multiple layers of acoustic foam (IXPE, PET, EPDM) and a steel plate for sound customization.
Content CreationKeychron K4 Max
  • •The integrated number pad on the 96% layout is useful for data entry and shortcut macros.
  • •Deep programmability via QMK/VIA allows for complex macro creation for editing software.
  • •The large 4000mAh battery supports long, uninterrupted work sessions.

Frequently Asked Questions (FAQ)

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