Test your drawing tablet or stylus online. Check pen pressure, tilt, eraser, barrel buttons, hover and pointer coordinates with this free browser-based diagnostic.
Draw a line or bring the pen near the surface.
Awaiting pointer input on the test canvas.
No stylus or mouse events have been received in this browser session.
Draw or hover your stylus over the canvas above to begin.
If strokes draw but pressure never varies:
If Tilt X/Y stay at 0°:
If your pen registers as mouse clicks:
Modern web browsers unify mouse, touch, and pen interactions into the Pointer Events specification, exposing extended properties like pressure, tiltX, tiltY, and twist when reported by OS drivers.
Rather than raw hardware force values, browsers represent tip pressure as a normalized scale from 0.00 (no contact) to 1.00 (maximum force), mapping physical pressure steps to brush dynamics.
Tilt values specify the inclination angle (-90° to +90°) of the stylus shaft relative to the screen plane, allowing digital painting apps to simulate angled chisel brushes and pencil shading.
Active styluses communicate with tablet digitizers while hovering slightly above the surface (hover mode). Browsers track hover coordinates when pointerType is pen and pressure is 0.00.
Browsers depend on OS-level APIs like Windows Ink or macOS Native Pointer APIs. Enabling Windows Ink in Wacom or Huion control panels is often required to expose pressure to browsers.
Graphics tablets feature barrel buttons or top eraser sensors. Browsers detect barrel buttons via bitmask button events, while dedicated erasers report eraser pointer types where supported.
Quick answers about how this tool works.
Plain-language explainers that sit next to this tool.
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