The .wld extension names two unrelated things: a Terraria game world and an Esri world file that georeferences an image. A world file holds six numbers describing an affine transformation between an image’s pixels and real-world map coordinates. The convention was introduced by Esri, and the file itself records no coordinate system - only scale, rotation and position. In Analyser's format library, .WLD sits in the System & disk category.

How do I open a .WLD file?

Drop a .WLD file onto Analyser at https://analyser.valjdakosta.com/ and it opens directly in your browser - no upload, no account and no software to install. Open a Terraria world save (.wld) and see the map drawn from its own tile data - one pixel per tile, with terrain and ore veins in the foreground, walls shaded behind them, and water, lava and honey in their own colours. Reads the world name, the seed it was generated from, its size and difficulty (Classic, Expert, Master or Journey) and the game version that last saved it, and the map can be saved as a PNG. Worlds from Terraria 1.3 and 1.4 are drawn; the .wld extension is shared with the Esri world file that georeferences an image, and the two are told apart by their bytes.

Can I open a .WLD file online for free?

Yes. Analyser is a free online .WLD opener and viewer that runs entirely in your browser - your .WLD file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.WLD file - what it is and how to open it online

Analyse a .WLD file

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What is a .WLD file?

The .wld extension names two unrelated things: a Terraria game world and an Esri world file that georeferences an image.

Esri world file

What it is: A world file - six lines of plain text giving the pixel size, rotation and origin that place an image on a map. Analyser reads the transform and reports the ground resolution it implies.
How to tell it apart: A world file is plain text: six numeric lines and nothing else.

Terraria world

What it is: A Terraria world save - the whole game world as a tile grid. Analyser reads the world name, seed, size and difficulty, and draws the map one pixel per tile from the tile data, with terrain, ores, walls and liquids.
How to tell it apart: A Terraria world is binary and carries the ASCII magic "relogic" just after its version number.

Did you know: In Analyser's format library, .WLD sits in the System & disk category.
Analyser opens .WLD files right in your browser - they are parsed and rendered on your device, never uploaded to a server.
Open a .WLD file: Drag a .WLD file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: Browse the full list of supported file types.