How it works
The workflow, examples and limits behind every tool.
Open tray ↗
Flat width = base width + twice the side height. Dashed lines fold; solid lines cut. Corner tabs attach to the inside of adjacent sides.
Example: A 100 × 70 × 25 mm tray occupies 150 × 120 mm before the outside print margin.
Dimensions describe fold lines. Card thickness and cutting tolerances are not modeled; make a scrap-paper test first.
Box & lid ↗
The lid base is wider and longer by twice the entered per-side clearance. The two pieces are printed separately.
Example: A 100 mm box with 1 mm clearance per side gets a 102 mm lid base.
Clearance is user-selected. Thick, coated or handmade paper may need a larger fit allowance.
Envelope ↗
The center panel uses the entered finished dimensions. Side flaps fold first, the bottom overlaps them, and the top closes last.
Example: A 140 × 90 mm center panel with 35 mm side flaps produces a 210 × 189 mm net, with overlapping closing flaps.
A simple paper envelope, without a seal or postal-service size certification.
Paper fit ↗
Test both 0° and 90° orientations inside the paper minus your chosen margins. Show the exact fit or required scale.
Example: A 150 × 120 mm net fits A4 with 10 mm margins at 100%.
Browser printing can still scale. The SVG has physical mm units; print at actual size and verify its 50 mm scale bar.
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/.