keystonePattern projector

Display changed. Check your calibration before projecting.

STEP 1 · SET UP YOUR MAT

A perfect fit.

Match the projected grid to a measured rectangle on your cutting mat.

WidthHeightUnits

Use the measured grid area, which can be smaller than your mat.

Adjust a corner

Drag any corner. Hide controls for a clear view. Arrow keys move precisely; Shift moves farther.

Calibration stays fixed when you open a pattern.

STEP 2 · OPEN YOUR PATTERN

Your mat is ready.

Open a PDF, SVG, or image.
Your calibration stays exactly where you set it.

Or drop a file anywhere · Files stay on this device

View

Projection colors Line weight

Overlays

Calibration grid Mat border Center fold lines Wrong-side dots Size-check overlaySize in

These overlays use your mat calibration, independent of the pattern scale.

Join tiled pattern pages into one continuous pattern.

Pages in order

Ranges, repeats, and 0 for a blank. Use !3 to exclude page 3.

ColumnsRows

Fill order

Trim page margins in

TopBottom

LeftRight

Overlap in

HorizontalVertical

Overlap updates the projection as you type.

Export uses the current pattern scale. Projection colors and rotation are display settings.

Show just the sizes and markings you need.

Pattern scale (%)

Image width in

Set a known width or use the measurement tool below to establish the image’s physical size.

Correct scale from a known size

Draw over a printed test line or square in your pattern. Enter the size it should be.

No measurement selected

Intended length / side in

Selected mark

Drag the four corners to match your mat

Page number/ 1

100%

From grid to fabric

Enter the width and height of a measured area on your mat.
Enter fullscreen first, then drag the projected grid corners to match that area.
Choose Continue to pattern and open a file. PDFs use their native print size.
Use Stitch for tiled PDFs, Layers for pattern sizes, and Scale to check a known test line or square.

Moving the projector, changing browser zoom, or changing displays can affect calibration. Use the grid or a size-check overlay to verify alignment.

Undo Ctrl/⌘ ZRedo Ctrl/⌘ Shift Z / Ctrl/⌘ YMove PMeasure LRotate RFlip H / VColors ICenter COverview ZMagnify MFullscreen FControls Tab

Inspired by Pattern Projector. Files are processed locally and are never uploaded.

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