Digitizer Calibration Tool (tabcal)

Run: tabcal.exe

Overview

Calibrates touchscreen digitizers and pen input devices so that touch contact points accurately map to on-screen coordinates. Follow the on-screen crosshair targets by tapping each point precisely. Calibration data is stored per-display, so each monitor's touch layer is calibrated independently on multi-display setups.

When to Recalibrate

• After replacing or reseating a touchscreen panel
• After connecting a new external touch monitor
• When users report touch offset (touch registers in wrong position)
• After a Windows update that resets pen/touch settings
• When calibration drift develops over time on older hardware

Commands

# Run calibration wizard:
tabcal.exe

# Reset calibration to factory defaults:
tabcal /reset

# Calibrate a specific display (by display number):
tabcal /display:1

Third-Party Tablets

For Wacom, Huion, XP-Pen, and other third-party graphics tablets, use the manufacturer's own software instead of tabcal:

• Wacom: Wacom Tablet Properties → Calibrate
• These tablets use proprietary drivers that tabcal does not interact with

Checking Digitizer in Device Manager

devmgmt.msc → Human Interface Devices → HID-compliant touch screen

Check for driver errors, update drivers from here if calibration issues persist after recalibration. Also check: Human Interface Devices → HID-compliant pen for stylus devices.

IT Notes

Deploy recalibration steps to end users via documentation when touch offset is reported after Windows updates. Calibration data is stored in the registry under HKLM\SYSTEM\CurrentControlSet\Control\Tablet PC\Calibration.