- Fujitsu UX-K3 weighs only 634 grams, which sets a new global benchmark
- Fujitsu combines carbon fiber and magnesium-lithium for strength without extra bulk
- The notebook’s WUXGA IPS panel delivers accurate colors and minimal glare
Fujitsu has once again entered the record books with the launch of the new UX-K3, a laptop weighing only 634 grams.
This model now shares the title of world’s lightest laptop with the 2022 Fujitsu Lifebook WU-X/G2 and the 2024 Dynabook Lifebook WU5/J3.
With this release, all three record holders are Japanese-made, each weighing exactly 634 grams – the lightest laptops ever produced.
Design focus on weight and durability
The latest model, the UX-K3, joins Fujitsu’s FMV Note U series, and unlike previous versions that are only available online, it will appear in retail stores for direct hands-on experience.
The FMV UX-K3 maintains its low weight through an unusual mix of materials, as its top panel uses carbon fiber, while the keyboard and base are made from a magnesium-lithium alloy.
Despite its lightweight design, this laptop is built to resist bending during normal use.
The included AC adapter has also been reduced in size and weight, now just 151 grams compared to the previous 280 grams.
With these refinements, Fujitsu continues its focus on reducing travel weight for mobile users while maintaining practicality.
The FMV UX-K3 is powered by an Intel Core Ultra 7 255U processor with a 12-core, 14-thread setup with integrated Intel graphics and a built-in AI engine rated at 12 TOPS.
This device also comes with 16GB of memory and a 512GB SSD and uses a 14-inch non-glare WUXGA (1920 x 1200) display with a 16:10 aspect ratio, giving more vertical workspace than the older 16:9 format.
The panel covers the entire sRGB color gamut and supports wide-angle IPS technology for consistent color and brightness across viewing angles.
Typical brightness reaches around 400 nits, allowing visibility in bright office environments while maintaining low reflectivity thanks to the matte finish.
Wireless connectivity includes Wi-Fi 7 and Bluetooth v5.4, while the port layout includes USB Type-C, USB Type-A, HDMI, a microSD slot and a Gigabit LAN port.
The laptop’s design also includes a Windows Hello-compatible fingerprint sensor and a private webcam shutter.
The Fujitsu UX-K3 notebook’s battery life is estimated at seven hours during video playback and up to 18 hours when idle.
Priced at around ¥280,280 (approx. $1,863) at the FMV store, this device is not a budget laptop, but is aimed at users who value portability over raw performance.
Fujitsu also introduced the U77-K3, a heavier variant at about 869 grams, which offers a larger battery that supports up to 35 hours of operating time.
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