Lightbench

Reference rectangle on your mat

Width × height

Type the size of your mat, or of a rectangle printed on it. Then drag the four red corners onto its corners. The grid then matches the mat and everything shows at true size.

Fine-tune a corner

Step

Saved setups

Projector link: Bluetooth carries sound only. Mirror or extend the screen (AirPlay, Chromecast, Miracast) or use USB-C to HDMI, then calibrate in full screen.

Open adds to the project, so a lining or a second pattern can sit beside the first. Everything stays in this browser on this device.

Files

Pattern

Line darkness

Raise it if marking spills past a faint line. Lower it if grey shading gets in the way.

Show the PDF sheet Show one piece at a time Dim pieces already cut

Pattern pieces

No pieces marked yet. Mark them once and you can project them one at a time and tick them off as you cut.

Screen

Brightness

Line weight

Grid G

Spacing

Brightness

Bias strips T

Strip width mm

Brightness

Snap lines onto the pattern N

Shortcuts

V L MMove · Line · Mark pieces ← → ↑ ↓Nudge 1 mm (Shift 10 mm) [ ]Turn 1° (Shift 0.1°) RTurn 90° 0Back to true size G T NGrid · Bias strips · Snap Q H FQuiet · Hide controls · Full screen ⌘Z ⇧⌘ZUndo · Redo EscBack to Move, or let go

Drag a piece to move it. Drag the empty mat to move everything. Two fingers on a piece turn it; two fingers on the mat zoom.

QUIET · TAP TO RETURN

Drop a pattern to add it