You need two things: the region file your build sits in, and the coordinates of two opposite corners around it. Once you have done it once, it takes about five minutes.
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Magi reads .mca region files from a Java Edition world save.
Everyone can post up to three builds per day.
Six steps to a posted build
Press F3 in-game to read the coordinates where you are standing. Picture a box around your build and note the two opposite corners of it — that pair is what the post form asks for.
Height matters as much as X and Z. Include a block or two of ground under the build so it does not end up floating in the scene.
The post page draws the same box, so you can check your numbers against the diagram as you type.
Region files live in the region folder of your world save: %AppData%\.minecraft\saves\<world>\region on Windows, ~/Library/Application Support/minecraft/saves/<world>/region on macOS. The Nether is under DIM-1/region and the End under DIM1/region.
Each file is named r.<X>.<Z>.mca and covers 512×512 blocks. You do not have to work out which one you need: enter the coordinates first and the page tells you the exact file name to pick.
One build has to fit inside a single .mca file. If your area crosses a boundary the page says so — pull the range back, or post the halves separately.
Pick the file and the browser reads it on the spot and draws a 3D preview. Blocks show up as purple question marks — this stage is about the shape and the extent, not the materials.
The block count appears here too. A build has to contain between 2 and 100,000 blocks. If you are over, tighten the range: a lighter build also moves more smoothly on whoever opens it.
Run down the checklist and hunt for strays: the neighbour's wall clipped at the edge, a cave system under the floor, scaffolding still standing in the sky. Trimming X, Z and Y here is what leaves your build as the only thing in frame.
Titles are three characters or more. It is the text that shows up in listings, in browser tabs and on the share card, so it is worth a moment.
The front direction is the face people meet first. Point it at the entrance or the facade and the build introduces itself the instant the page opens.
Posting hands the data to the server for conversion. Your page shows the build as Converting until it is ready, then as Public — hit refresh to see the change.
The share button copies the link. Paste it anywhere and it expands into a card with a picture of the build. You can delete a build from your page at any time, and deletions are permanent.
Read the start and end coordinates once more — a single sign is enough to move the box somewhere empty.
Chunks that have never been generated are empty. Visit the place in-game once so the chunks load, save, and try again.
In a superflat world the terrain sits between Y = -63 and -50.
Making it look good
Torches left on the dirt, a half-dug hole, a cow that wandered in — anything inside the box gets posted with the build.
One or two layers of terrain under the structure make it sit on something instead of hovering.
A tighter range means fewer blocks, smoother rendering, and details people actually stop to look at.
Lanterns and glowstone indoors only pay off once someone drags the time of day into the evening — and they will.
After you post
Check whether a build is still converting, copy its share link, or delete it. Your favorites live on the same page.
Your icon is a single emoji and your ID is 3–20 characters. Both can be changed once every 30 days.
Search tags are curated on our side, so there is nothing to fill in when you post. Search accepts #tag and @id.
Stuck on something the steps do not cover? The rest is collected here.