How it works
The workflow, examples and limits behind every tool.
Signature planner ↗
One folded sheet makes four pages. Signatures = ceil(target pages ÷ (4 × sheets per signature)).
Example: 100 target pages and 4 sheets per signature need 7 signatures, 28 sheets and 12 blank pages.
Includes all target pages you enter. No automatic imposition or PDF rearrangement.
Spine estimate ↗
Thickness = (pages ÷ 2) × (sample stack thickness ÷ sample sheets) + extra.
Example: 200 pages, 10 mm per 100 sheets and 2 mm allowance gives 12 mm.
Paper-only estimate plus your allowance. Glue, sewing swell and rounding need a physical mock-up.
Cover layout ↗
Width = 2 × board width + spine + 2 × joint + 2 × turn-in. Height = board height + 2 × turn-in.
Example: 150 × 210 mm boards, 20 mm spine, 7 mm joints and 15 mm turn-ins produce 364 × 240 mm.
A simple rectangular case plan. Board thickness and hinge clearance need a test fit.
Sewing stations ↗
Pitch = (spine length − 2 × margin) ÷ (station count − 1). Positions are measured from the top edge.
Example: 210 mm spine, 15 mm margins and 5 stations give positions 15, 60, 105, 150, 195 mm.
A spacing guide only, not a binding-specific sewing instruction.
Local work, explicit limits
Each workspace reports its input and file limits. Imports validate the supported format before asking to replace saved work. Plain text is displayed as text, never executed as markup. Both languages use the same tools; the root address always opens in English, with Chinese under /zh/.