Josawa ALF-4KU3-CAP


The Josawa ALF-4KU3-CAP is a 4K HDMI to USB video and audio capture card. It supports HDMI2.0 for input and output and USB3.0 for recording. The USB-B output can be used to power the device and capture videos with resolutions up to 4K@30 Hz or 1080p@120Hz. It can be widely used in video conference, multi-media broadcasting and other HDMI video capturing occasions.


  • Support HDMI input resolution up to 4k60 4:4:4; HDMI output resolution up to 4k60 4:4:4;
  • Support HDCP2.2, backward compatible
  • USB-B supports USB3.0 for recording
  • USB-B capture support record resolution MAX up to 4K@30Hz or 1080P@120Hz
  • Compatible with Windows7/8/8.1/10/11, MacOS, LinuxOS system, plug and play
  • Support the third-party software compatible with UVC & UAC protocols, such as OBS/Potplayer/VLC/Skype/Zoom/ Adobe Flash Media Live Encoder/Vmix/Xsplit/Wirecast, and live streaming platform software, etc.
  • Support LINE mix input
  • Support LINE out output
  • Support YUY2, RGB32,NV12 capture format


(1) HDMI In, (2) LINE in

Input Connector
(1) HDMI, (2) 3.5mm jack

(1) HDMI Out, (2) USB Record, (3) LINE out

Output Connector
(1) HDMI, (2) Type-B USB, (3) 3.5mm jack

HDMI Standard
Max up to HDMI2.0,18G

HDMI Input Resolution
Up to 4K@60Hz 4:4:4

HDMI LOOP Resolution
Up to 4K@60Hz 4:4:4

USB Version
USB3.0 transmission rate up to 300~350MB/s.

USB Output Color Space

HDMI Audio Format
PCM2.0 48KHz

Microphone Audio Format
PCM 2.0

Headphone Audio Format
PCM 2.0

OS Support
Windows, Mac OS X (10.12 or above), Linux.

Compatible Media Player
OBS, Potplayer, VLC and so on.


Operation Temperature
0 to +55℃ (0° to +131°F)

Storage Temperature
0 to +70℃ (0° to +158°F)

Relative Humidity
10% to 90%, Non-condensing

Dimension (W*D*H)
100mm x 62.5mm x 22.5 mm

Net Weight



Technical Sheet

User Manual