Line continuity
Draw one slow line across the entire screen and check for gaps or sudden jumps.
Stylus Drawing Test
Check pen strokes, touch continuity, pressure, tilt and pointer behavior on compatible laptops, tablets and phones.
Draw anywhere in this areaUse a pen, Apple Pencil, finger, trackpad or mouse.
Tip: draw slow curves, straight lines, small circles and edge-to-edge strokes. Gaps or unexpected jumps can indicate input, palm-rejection or browser issues.
What can the stylus drawing test check?
It can reveal broken strokes, missed areas, jitter, unexpected jumps and whether the browser reports pen pressure or tilt. It works with touch, mouse and compatible pen input without installing software.
✓ Pen and touch input✓ Local drawing✓ PNG export
Recommended stylus checks
Pressure response
Vary pressure and watch whether supported hardware reports changing values.
Edge accuracy
Draw around every edge and corner to check difficult input areas.
Small-detail control
Write small text and circles to inspect jitter and precision.
Frequently asked questions
Does the stylus test support Apple Pencil?
On compatible iPadOS and Safari versions, Apple Pencil input may be exposed through Pointer Events. Pressure and tilt availability depend on the browser and device.
Why does pressure stay at zero or a fixed value?
Some browsers, touchscreens, mice and styluses do not expose pressure data. The drawing test can still check continuity and pointer movement.
Are drawings uploaded?
No. Drawing and PNG export happen locally in the browser unless you separately choose to share the saved file.
Explore more diagnostics
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Move between screen, camera, audio and device checks without returning to the homepage.
Dead Pixel TestInspect solid colors for dead, stuck, bright or dark pixels.
Touch Screen TestCheck touch coverage, dragging continuity and dead zones.
Keyboard TesterTest a full-size keyboard and confirm every key press.
Mouse TesterTest buttons, wheel, movement, dragging and double-clicks.
Audio TesterCheck speakers, stereo channels, tones and microphone input.
Camera & WebcamTest built-in, USB, phone, tablet and compatible TV cameras.
Microphone TesterView microphone levels, waveform, recording and playback.
Pixel ExerciserExercise a suspected stuck-pixel area with changing colors.
Gradient TestInspect gradients, tonal transitions and visible banding.
Brightness & ContrastCheck black levels, white saturation and contrast separation.
Screen Size TestView viewport, resolution, pixel ratio and display data.
Text SharpnessInspect text rendering, browser scaling and clarity.
Motion & GhostingObserve motion blur, ghosting and response behavior.
Resolution & ScalingCheck screen resolution, CSS pixels and scaling.
Device InformationReview screen, browser, hardware and platform information.
Browser CapabilityCheck which browser APIs and hardware features are supported.
Network TestCheck connection status, latency and estimated download speed.
GPS & LocationTest browser geolocation, accuracy, altitude and speed.
Sensor TesterTest orientation, motion, acceleration and rotation sensors.
Multi-Touch TesterTrack multiple touch points, pinching and rotation gestures.Screen Color ToolsOpen exact full-screen color pages for pixel, uniformity and lighting checks.Response Time TestObserve ghosting, blur and pixel-transition behavior at several speeds.Stylus Drawing TestCheck pen, touch, pressure, tilt and drawing continuity in your browser.
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