Joker Studio

Joker Studio is an offline pattern-drafting tool for sewing makers who need precise seam allowances and printable cutting lines.

Create closed pattern pieces, tune every edge, place notches and a grainline, then export a true-scale tiled A4 PDF ready for the cutting table.

Key features:
• Project library with search, sorting, favorites, duplicate and undo delete
• Closed-polygon editor with pinch zoom, pan, grid snap and fit-to-view
• Independent seam allowance on every edge (0–100 mm)
• Edge notches, editable grainline and piece labels
• Undo/redo history with local autosave
• CSV contour import via the system document picker
• Versioned JSON backup export/import
• True-scale vector PDF export with calibration square, registration marks, seam line and cutting line
• Millimeters or inches, light/dark/system themes

Privacy by design:
• No account and no login
• No ads, analytics or advertising ID
• No internet permission — projects stay on the device

Print tip: use Actual size / 100% and check the included 50 mm calibration square before cutting.