Minecraft arch generator

Width, rise, leg height and thickness — the generator builds a half-elliptical block arch: a doorway, a castle gate, a bridge or aqueduct span. The shape shows in 3D at once, export to .litematic and .schem.

How it works

1. Set the dimensions with the sliders — the shape is recalculated instantly and shown in 3D.
2. Pick a block (some tools take two: main and secondary).
3. Turn on Layers to see the shape slice by slice — handy for building by hand.
4. Download .litematic for Litematica or .schem for WorldEdit.

Examples

• Doorway 11×6
• Bridge span 25
• Gate 7

FAQ

How do I get a clean keystone?

An odd width gives a single keystone block at the top, an even width gives two. Keep the rise around half the width for a natural-looking curve.

How do I build this without mods?

Open the schematic in the viewer, turn on Layers and place blocks layer by layer on the grid. With Litematica or WorldEdit the schematic is pasted in one go.

Why does the shape look stepped?

Blocks are whole, so every curve turns into steps — the game does the same. An odd size gives a clean centre block, an even size gives two.

Is it free, no sign-up?

Yes. Everything is computed in the browser; the file is built locally and never uploaded.

See also: Roof · Minecraft builder tools