Web Pen Pressure Test - Stylus Tilt, Curve and Wobble

Live Pen Pressure Tester

Draw with a compatible stylus. The tool separates analog pressure from the constant 0.5 pressed-state value commonly reported by a mouse.

Use a pressure-sensitive pen and draw a slow straight diagonal, then vary pressure from light to firm. Mouse input is accepted only as a limited fallback.

Guided capability check

Detect a real pen pointerWaiting
Reach light and high pressureWaiting
Move the pen through a tilt rangeWaiting
Finish one deliberate straight strokeWaiting

Draw a straight diagonal for wobble evidence, then make light-to-firm strokes for the pressure curve.

Hold the pen steadily in contact for about one second.

Live pen data

0.000Pressure

--Minimum

--Maximum

--Average

0Samples

--Observed sample rate

--Pointer type

--Tilt X

--Tilt Y

--Tilt magnitude

--Tilt direction

--Twist

--Tangential pressure

--Barrel button

--Eraser end

Browser capability matrix

Pointer Events: --
Analog pressure: --
Tilt data: --
Twist data: --
Tangential data: --
Coalesced samples: --
Pen buttons: --

Pressure curve and stroke evidence

Recent pressure history

Pressure distribution

Light-touch reach--

High-pressure reach--

Steady-hold pressure jitter--

Straight-stroke evidence

Draw one deliberate straight stroke with at least eight samples.

Line deviation (RMS): --
Maximum deviation: --
Local jitter estimate: --

These pixel values describe the path delivered to this browser. Hand movement, zoom, display scaling, driver smoothing, and browser sampling all affect them; they are not a hardware pass/fail verdict.

Recent samples

Time	Pressure	Tilt X	Tilt Y	Twist	Buttons
No pen samples yet.

All measurements stay in this browser. Exports contain only this session’s pointer measurements and browser capability flags.

A browser cannot read raw tablet firmware or electrical sensor data. A missing field usually means the browser or driver did not expose it, not that the pen is defective.

Rate Live Pen Pressure Tester: 5.0 (1 rating)

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Live Pen Pressure Tester is a free, browser-based screen testing tool that lets you test stylus pressure, tilt, twist, pen buttons and browser-observed line wobble with live Pointer Events data, pressure history and private CSV or JSON export.

Cost: Free, no signup
Install: None — runs in the browser
Privacy: Runs locally, no uploads
Platforms: Windows, macOS, Linux, Android, iOS
Time: Under a minute

Reliable browser workflow

How to test pen pressure and tilt

Use the same browser, tablet driver, zoom and display scaling when comparing two sessions.

01 Confirm pen detection Touch the drawing area with the stylus and confirm Pointer type changes to pen. A mouse is only a limited fallback.

02 Sweep the pressure range Draw several slow strokes from very light to comfortably firm pressure; do not force the nib.

03 Check tilt and buttons Lean and rotate the pen, then try the barrel button and eraser end if your device exposes them.

04 Draw one straight diagonal Make a deliberate straight stroke for browser-observed deviation and jitter evidence, then repeat before comparing.

pen pressure test stylus tilt test drawing tablet test pressure curve line wobble Pointer Events

Missing fields are usually browser or driver limitations. This page cannot inspect raw tablet firmware, calibrate force, or prove a hardware defect.

Tool FAQ

Common questions

Why does pressure stay at 0.5?

Browsers commonly report 0.5 for a pressed mouse or a device that exposes only pressed versus released state. It is not an analog pressure reading. Use a compatible pen, current tablet driver and a browser that exposes Pointer Events pressure.

Can this test calibrate my drawing tablet?

No. It displays the normalized data delivered to the browser. Use the tablet manufacturer’s driver utility for force calibration, mapping, firmware and device-specific settings.

Why are tilt, twist or tangential pressure missing?

Not every pen supports those sensors, and browsers or drivers may omit them even when the hardware has them. Not exposed does not by itself mean the pen is broken.

Does the wobble number prove my digitizer is faulty?

No. It measures deviation in the browser-rendered stroke. Hand movement, browser zoom, display scaling, driver smoothing and event sampling all influence the number, so compare repeated controlled strokes rather than treating it as a pass/fail result.

Are my drawings uploaded?

No. Strokes and measurements remain in your browser. CSV and JSON exports are generated locally and contain only the current session’s pointer samples and capability flags.