mcweb - Minecraft worlds in the browser

1Open a world

Drop a world folder or .zip here

Dimension

Your worlds are usually here:

%AppData%\.minecraft\saves

Paste it into the address bar of the file dialog to jump straight there. More help finding your world

"Folder with write access" lets mcweb put the changed region files back itself, so you never leave the tool. The browser refuses folders under AppData for that, so use a copy of the world somewhere else — which is where you should be experimenting anyway.

Pick the world folder itself, the one that holds level.dat. The browser will ask whether to upload the files. That is the standard wording of its dialog: everything is read locally, nothing is uploaded.

2Viewopen a world first

Mode Slice height Y

Distance

The walkthrough shows static blocks only: no entities, no block updates. Click the view to capture the mouse.

Distance is a radius in chunks, so 16 loads four times the area of 8 and takes noticeably longer to fill in. Underground the view is a horizontal band around you; looking up from deep below shows where it ends. Nothing here changes your world.

Colours come from a built-in table. You can load the textures of your own resource pack or client.jar instead; the file is read locally.

3Selectionopen a world first

Hold shift (or the right mouse button) and drag a rectangle.

X from to Z from to

Vertical extent

Y from to Extra depth Fill caves

nothing selected

4Exportselect an area first

Schematic version Block size in mm Include plants and decoration

5Insert a modelopen a world first

3D models: glb, stl, obj, ply, or a zip holding an obj with its mtl and textures. Images: png, jpg, webp. Block builds: schem.

no model loaded

Size, position and orientation are set with the rectangle on the map.

Filling

Wall thickness Close pinholes

A surface voxelisation of a scan is one block thin and full of single-cell holes. Solid filling or a wall thickness of 2 gives a build you cannot see through.

Block palette

Dithering

Height Sink into ground Foundation Air above

The preview updates as you move the rectangle. Walk through it before freezing. Writing rebuilds the affected region files and packs them into a ZIP with a README. Extract it over a copy of your world, never over the original. To choose the folder for every download, switch on "Ask where to save each file" in your browser's download settings.

Drag to pan, scroll to zoom, shift-drag to select.