Minecraft
Nether Portal Sync
Portal linking confuses more Minecraft multiplayer groups than anything else, and nearly every case comes down to two Nether portals sitting close enough to compete for the same link.
Nether Portal Linker
Existing Nether Portal Position (Optional)
Portals within 16 blocks of each other can link — this checks for that.
Nether Coordinates
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How the numbers are worked out
Distances in the Nether are squeezed eight to one compared with the Overworld: walk eight blocks up top and you have covered one below. The calculator translates coordinates either way, and flags when a portal you are about to build would end up near enough to an existing one to link to it rather than making its own.
The formula
- nether = floor(overworld ÷ 8)
- overworld = nether × 8
- distance = √((x₁ − x₂)² + (z₁ − z₂)²)
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Common mistakes
The game searches a wide area for a partner portal, which is why portals that seem far apart still pair up. If two builds keep hijacking each other's portals, move the Nether-side portal further from its neighbour — changing the Overworld side will not fix it.
A worked example
A portal at X 1000, Z 2000 in the Overworld belongs at X 125, Z 250 in the Nether: both coordinates divided by eight. Negative coordinates round down, so X -100 becomes -13, not -12, which is the detail that puts hand-built portals one block off. Height is not scaled at all; Y is whatever is convenient on each side.
Why portals link to the wrong one
On Java Edition since 1.16, a portal leading into the Nether looks for an existing portal within 16 blocks of the matching point, and one leading back looks within 128 blocks. If another portal is inside that range, you arrive there instead of at a new portal. The calculator flags a Nether portal within 16 blocks of the one you are planning, which is the usual cause of two bases sharing a destination.
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