Keychron J4 vs K2 MaxTKL Size or 75% Layout
Choose the J4 for its larger 80% layout and lower weight, or the K2 Max for its 75% footprint, ISO options, and aluminum-frame variant.
KeebFinder may earn a commission when you buy through these links, at no extra cost to you.
No reviews
from$59at Keychron
4.5 (2)4.5 · 2 reviews
from$94at Keychron
Which one should you get?
Get the
Keychron J4
Build quality in the top 25% of 80% boards under $100.
- 80% ANSI layout provides a larger layout than the K2 Max's 75% design.
- 870g listed weight is lighter than the K2 Max's 940g.
- Keychron describes multiple acoustic foam layers, including IXPE, PET, and EPDM.
- North-facing LEDs. Cherry-profile keycaps can hit the switch housing.
- No ISO layout. ISO-DE, UK, and other ISO variants are not offered.
- No numpad.
Get the
Keychron K2 Max
Screw-in stabilizers
Build quality in the top 10% of 75% boards under $100.
- 75% layout and smaller listed dimensions than the J4.
- ANSI and several ISO layout variants are listed, including ISO-DE, ISO-UK, ISO-Nordic, and ISO-SW.
- An aluminum-frame option is listed alongside ABS builds.
- South-facing LEDs. Shine-through legends stay dark, and some sculpted keycaps can clip the LED.
- No numpad.
Choose the J4 if you want an 80% ANSI layout and a lower listed weight. Choose the K2 Max if a smaller 75% layout, ISO availability, or an aluminum-frame option matters more. Before buying, check the LED orientation against the keycaps you plan to use.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
Keychron J4
Keychron K2 Max
Layout size
80%
75%
Case material
ABS
ABS, Aluminum
Weight
870 g
940 g
Heavier boards stay planted and lighter ones travel
Layout standard
ANSI
ANSI, ISO, ISO-DE, ISO-Nordic, ISO-SW, ISO-UK
ISO and JIS exist so regional layouts fit
Screw-in stabilizers
No
Yes
Easier to tune than the plate-mount stabs you get prebuilt
- Keychron J4
- Keychron K2 Max
- Performance
- 8281
- Build quality
- 7186
- Productivity
- 8995
- Customizability
- 8991
- Portability
- 7379
- Connection: Bluetooth, 2.4 GHz, Wired
- Hot-swappable
- Battery: 4,000 mAh
- Max polling rate: 1,000 Hz
- Switch options: Clicky, Linear, Tactile
- QMK
What will you mostly use it for?
The K2 Max edges ahead for office use, travel, modding, and content creation, mainly through its smaller layout, ISO availability, and aluminum-frame option. Gaming and programming are close calls because both keyboards share core connectivity, polling, and customization features. The J4 remains a fit for buyers who prefer an 80% layout, while the K2 Max prioritizes a more compact arrangement. LED orientation is worth checking if you plan to change keycaps.
It's a tie
- Both list 1000 Hz polling and 2.4 GHz, Bluetooth, and wired connectivity.
- Both support N-key rollover in the product specifications.
- The J4 has north-facing RGB, while the K2 Max has south-facing RGB, which can influence compatible keycap choices.
Keychron J4 vs K2 Max specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
9 of 26 specs differ
Keychron J4
Keychron K2 Max
Switch options
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout size
Layout standard
Ergonomics
Display
Media keys
Connection
Max polling rate
Battery
USB-C
Case material
Plate material
Keycaps
Weight
Dimensions
Typing angle
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
ISO layouts by store
Which stores sell ISO-DE, UK, and the other regional layouts.
Keychron J4
No ISO layout at the stores we track.
Keychron K2 Max
Keychron
ISO-DE, ISO-UK, ISO-Nordic, ISO-SW
In stockShips to you
Keychron (DE)
ISO-DE, ISO-UK, ISO-SW
Out of stockDoes not ship to you
Compare prices
Live prices from the stores we track, cheapest in-stock offer first.
Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.
Lowest price across stores, Amazon excluded.
Keychron J4 vs K2 Max: your questions
The J4 uses an 80% ANSI layout, while the K2 Max uses a 75% layout and is offered in ANSI and several ISO variants. The K2 Max also lists an aluminum-frame option, while the J4 lists an ABS case.
The K2 Max is smaller by its listed dimensions: 32 x 317 x 122 mm, compared with the J4 at 38 x 366 x 138 mm. It also uses a 75% layout rather than the J4's 80% layout.
The K2 Max is listed with ISO, ISO-DE, ISO-UK, ISO-Nordic, and ISO-SW variants, as well as ANSI. The J4 is listed as ANSI only.
Neither keyboard has a numpad, according to its compatibility notes. The J4's 80% layout is larger than the K2 Max's 75% layout, but neither is a full-size numpad model.
Both support Bluetooth and 2.4 GHz wireless, as well as a wired connection. Both list a 4000mAh battery and 1000 Hz polling.
Both product listings include hot-swappable versions. Keychron says the hot-swap versions accept many 3-pin and 5-pin MX-style mechanical switches.
The K2 Max has south-facing LEDs, which Keychron says avoid interference with Cherry-profile alternative keycaps. The J4 has north-facing LEDs, and its compatibility note warns that Cherry-profile keycaps can hit the switch housing.
Both list QMK and VIA support, and Keychron describes QMK and its Launcher web app for key remapping and macros. Both also list hot-swappable switches.
The J4 is listed at 870g, while the K2 Max is listed at 940g. The J4 is therefore the lighter of the two by the listed weights.
The J4 lists an ABS case, a steel plate, and PBT keycaps. The K2 Max lists ABS or aluminum-and-ABS case options, a steel plate, and PBT keycaps.
Keychron lists two adjustable typing angles for the J4, 4.5° and 9.6°. The K2 Max lists three: 5°, 9°, and 12°.
Both list Mac/Win support, and Keychron says each works with Windows, macOS, and Linux. The K2 Max vendor description also says it includes keycaps for Windows and macOS.
Not sold on either?
Still torn?
Answer a few quick questions and the keyboard finder ranks 2,000+ boards by how you will actually use yours.