Free · Windows 10/11

Vector Paths
Into Real Motion

Synthetic cursor & pen motion for Windows. SyntheticPen replays SVG paths, signatures, and text as input the OS treats as a real pen.

Native Win32 input/SVG · TTF/OTF

● REPLAY
0.0%STROKES 3

01 / WHAT IT IS

Definition

A virtual pen plotter that lives inside Windows.

SyntheticPen reads vector geometry — SVG paths, glyph outlines, hand-drawn signatures — and replays it as synthetic mouse and pen input. The system cursor becomes a plotter head, tracing your geometry into any application that accepts input.

INPUT

SVG · TTF/OTF

Vector geometry and glyph outlines

OUTPUT

SendInput · WM_POINTER

Native Win32 cursor / pen events

PLATFORM

Windows 10/11

x64 and Arm64 · Microsoft Store

02 / HOW IT WORKS

Pipeline

From vector to input in three stages.

A three-stage pipeline turns static geometry into real-time, naturally-shaped pointer events. Each stage is deterministic, scriptable, and inspectable.

STEP 01commands = parsePath(svg)

SVG Path Parsing

Raw vector geometry is parsed into a normalized command stream — M, L, C, Q, A — and resampled into a continuous arc-length curve.

STEP 02plan = pace(curve)

Motion Planning

The resampled curve is paced by a curvature-aware velocity model, slowing through tight turns to match a natural pen feed.

STEP 03SendInput(plan.next)

Synthetic Input

Coordinates are dispatched as native Win32 input — synthetic pen injection with a SendInput fallback. The OS sees a real pen.

SVG PATH→MOTION PLANNER→SYNTHETIC INPUT

03 / USE CASES

Applications

Anywhere the OS accepts a pointer.

SyntheticPen produces native input. Any Windows application that listens for mouse, pen, or stylus events will receive its motion — no plugins, no shims.

PREVIEW · SIGNATURES

Replay a stored signature into any form, PDF, or signing surface that accepts pen input.

04 / TECHNOLOGY

Under the hood

Built like motion control hardware.

A curvature-aware velocity model and a native Win32 pen-injection path. SyntheticPen moves your cursor with the discipline a CNC controller brings to a tool head.

SPECIFICATIONSfree

InputSVG 1.1 paths · TTF/OTF glyph outlines

CenterlineEuclidean distance transform + skeletonization

ResamplerAdaptive arc-length · centripetal Catmull–Rom

VelocityCurvature-aware pacing (2⁄3 power law)

PressureDerived from stroke radius

DispatcherSynthetic pen injection · SendInput fallback

PlatformWindows 10/11 · x64 + Arm64 · MSIX

TelemetryNone · no network, no analytics

VELOCITY PROFILE · S-CURVEjerk-limited

Windows 10/11 · x64 + Arm64

Bring your geometry into motion.

Free on the Microsoft Store. No telemetry. Single signed binary.

Download — Free Read the docs

Can't use the Store? Download the MSI installer

MICROSOFT STORE · WINDOWS 10/11 · x64 + ARM64

Vector PathsInto Real Motion