2 layers61.8 × 21.6 mm

USBQuadMouse
PR77/CH554_USBQuadMouseKeyboard
CH554 based USB to Quadrature Mouse and Keyboard Interface
24 parts8MIT
KiCad boards from 3 GitHub repositories tagged “quadrature-encoder”, the most starred first; open any of them in PCBKit.

PR77/CH554_USBQuadMouseKeyboard
CH554 based USB to Quadrature Mouse and Keyboard Interface

Boardoza/Boardoza_Rotary_Encoder_ARGB_Control_Breakout_Board
Boardoza ROTARY ENCODER EC1101S is a rotary encoder breakout board with an integrated push button and addressable RGB LEDs, designed for interactive visual control and user input applications.

xtompok/home_automation_switchboard
Board fitting into wall switch, support for 1Wire, quadrature encoder, and much more. RS-485